Category: Water Contaminants

Microplastics have transitioned from a niche topic in marine biology to a primary concern for homeowners evaluating their tap water quality. As testing techniques grow more sensitive, scientists are detecting microscopic plastic particles in tap water, bottled water, rivers, and even inside the human body.

While headlines can sound alarming, the scientific understanding of human health risks is still evolving. This article provides a clear, factual breakdown of what microplastics are, where they originate, what research shows about their presence in drinking water, and how water filtration systems perform against them.

1. What Are Microplastics and Nanoplastics?

Plastic does not readily biodegrade; instead, environmental exposure to sunlight, wind, and wave action breaks it down into progressively smaller fragments. Plastic contaminants in water are generally classified into two primary size categories:

• Microplastics: synthetic solid plastic particles ranging from 1 micrometer (µm) up to 5 millimeters (mm) in size (about the size of a pencil eraser).
• Nanoplastics: plastic particles smaller than 1 micrometer (under 1,000 nanometers). Because of their sub-micron scale, nanoplastics are invisible under standard optical microscopes and require advanced chemical imaging technology to detect.

Primary Sources of Contamination

Microplastics enter the water supply through several everyday human activities and industrial processes:

• Synthetic Clothing Fibers: Washing synthetic garments (such as polyester, nylon, or acrylic fleece) sheds thousands of microfibers per laundry load. Wastewater treatment facilities capture many, but not all, of these fibers before effluent is discharged into waterways.
• Tire Wear and Road Runoff: Friction between vehicle tires (made of synthetic rubber compounds) and road surfaces generates tiny rubber-plastic particles. Rain washes this debris into storm drains and local surface waters.
• Degraded Plastic Waste: Single-use plastic packaging, bags, and bottles left in landfills or rivers slowly break down into fragments and microfibers over time.
• Cosmetics Microbeads: Historically added as exfoliants in facial scrubs and toothpaste, polyethylene microbeads washed down household drains. Although federal law banned intentionally added microbeads in wash-off cosmetics via the Microbead-Free Waters Act of 2015, older residues persist in environmental sediments.

2. What Studies Have Found in Drinking Water

As scientific instrumentation has advanced, researchers have shifted from studying ocean waters to testing tap and bottled water directly.

• Tap Water Contamination (Kosuth et al., 2018): In a global study published in PLOS ONE, researchers tested 159 tap water samples from around the world. The study found that 81% of tap water samples contained anthropogenic particles — nearly all of them fibers — with an average concentration of 5.45 particles per liter.
• Bottled Water Microplastics (Mason et al., 2018): A groundbreaking study by researchers at the State University of New York at Fredonia analyzed 259 individual bottles of water across 11 global brands (published in Frontiers in Chemistry). The team detected plastic particles in 93% of the tested bottles, averaging 325 particles per liter (including particles down to 6.5 µm). Polypropylene, the polymer frequently used to manufacture bottle caps, accounted for 54% of the identified particles, suggesting the packaging process itself contributes contamination.
• Bottled Water Nanoplastics (Qian et al., 2024): Utilizing single-particle Stimulated Raman Scattering (SRS) microscopy, researchers from Columbia and Rutgers Universities published a landmark study in PNAS. They found that bottled water contained an average of ~240,000 plastic particles per liter — roughly 90% of which were nanoplastics under 1 micrometer in size, which earlier analytical methods were unable to count. (That headline count has since drawn a published critique over laboratory blank methods, which the authors have answered; the exact number is debated, but the finding that bottled water carries far more plastic particles than tap water is not.)

3. Potential Health Effects: What Science Knows (and Doesn’t Know)

Understanding how microplastics affect human health requires distinguishing between detection and toxicity. Scientists have confirmed where particles go, but long-term health consequences remain an active field of study.

Where Particles Have Been Detected in the Body

Peer-reviewed studies have detected microplastics and nanoplastics in human blood, lung tissue, placenta tissue, and stool samples. Recent autopsy studies have also detected particles in cardiovascular tissue and human brain tissue samples.

The Current Scientific Consensus

• Biological Absorption: Larger microplastics (above roughly 150 micrometers) are generally not absorbed by the human gastrointestinal tract and pass through the body. However, smaller particles — particularly sub-micron nanoplastics — possess the theoretical capability to cross biological membranes, such as the gut lining or blood-brain barrier.
• Toxicity Concerns: Researchers are actively investigating two main areas of concern: cellular toxicity caused by physical particle irritation, and chemical exposure from plastic additives (such as phthalates or bisphenols) leaching into tissues.
• Current Status: In its public health evaluations, the World Health Organization (WHO) concluded that while routine monitoring is sensible, the current scientific evidence does not show a clear, quantified health risk from consuming microplastics at current levels in drinking water. Health institutions emphasize that more standardized research is required before firm conclusions can be drawn.

4. Regulatory Status: EPA Standards and Regulations

To evaluate your drinking water accurately, it is essential to understand federal and state regulatory frameworks.

Is there an EPA Maximum Contaminant Level (MCL) for microplastics?
No. There is currently no enforceable EPA drinking water standard or Maximum Contaminant Level (MCL) for microplastics or nanoplastics under the Safe Drinking Water Act. Public water utilities are not legally required to test for or report microplastic concentrations.

Regulatory Outlook:
The EPA has included microplastics on its draft Contaminant Candidate List 6 (CCL 6), published in April 2026. The CCL is a watchlist of unregulated contaminants known or anticipated to occur in public water systems. Inclusion on this list prioritizes federal research into standardized testing methodologies, occurrence, and toxicology, which represents the initial administrative step toward potential future regulation. Microplastics are often discussed alongside PFAS — the “forever chemicals” — as the two emerging contaminant stories in drinking water; you can read our full breakdown in PFAS in Drinking Water.

5. Particle Sizes vs. Filter Micron Ratings

Selecting the right water filter requires comparing particle dimensions against filter pore sizes. Particle dimensions are measured in micrometers (µm), commonly called “microns” (1 micron = 0.001 millimeters).

Size Reference Scale

• Human Hair Diameter: ~70 µm
• Fine Beach Sand: ~100 µm
• Microplastics: 1 µm to 5,000 µm (5 mm)
• Nanoplastics: under 1 µm (under 1,000 nanometers)

Absolute vs. Nominal Micron Ratings

When shopping for water treatment filters, understanding the difference between rating types is critical:

• Nominal Micron Rating: Per the Water Quality Association (WQA), a nominal rating means the filter traps about 85% of particles at the specified size. A 1-micron nominal filter still lets roughly 15% of 1-micron particles pass through.
• Absolute Micron Rating: Represents a verified physical barrier where the filter rejects 99.9% or more of particles at or above that specified micron size under laboratory test conditions.

6. What Removes Microplastics: Filter Types and Pore Sizes

Water treatment technologies vary in their ability to capture microplastics based on physical pore size and filtration mechanics.

Sediment Filters

Typical Pore Size / Rating: 1 µm to 50 µm

Microplastic Removal Capability: Moderate to High (traps larger fragments and synthetic fibers)

Nanoplastic Removal Capability: None (nanoplastics pass straight through)

Carbon Block Filters

Typical Pore Size / Rating: 0.5 µm to 10 µm

Microplastic Removal Capability: High (captures most microplastics ≥ 0.5 µm via physical straining and adsorption)

Nanoplastic Removal Capability: Low to None (sub-micron particles bypass carbon pores)

Reverse Osmosis (RO)

Typical Pore Size / Rating: ~0.0001 µm

Microplastic Removal Capability: Very High (~99%+ physical rejection)

Nanoplastic Removal Capability: High (rejects sub-micron particles down to ionic levels)

Important Note on Certifications

There is no standalone standard written only for microplastics — but that does not mean no certification exists. Microplastics Reduction is a certified claim under NSF/ANSI 401, the standard for emerging compounds, and real products carry it today, certified by NSF and by IAPMO R&T. When you shop, that claim — “Microplastics Reduction” under NSF/ANSI 401 — is the one to look for, and you can confirm any product’s listing in the certifier’s own directory before you buy.

The size-based claim still matters too: Particulate Reduction, Class I, under NSF/ANSI 42 covers particles of 0.5 to 1 µm (at least 85% reduction) — rust-and-sediment territory originally, but the same physical size range as larger microplastics. Be wary of any brand advertising a special “microplastic certified” logo outside these standards; check the claim against the NSF/ANSI 401 listing instead.

7. Regional Findings: Microplastics in New Jersey Waterways

Local research in New Jersey highlights how microplastics move through state water infrastructure and natural surface waters.

• NJ DEP Wastewater and Surface Water Analysis (2026): A May 2026 study published by the New Jersey Department of Environmental Protection (NJ DEP) Division of Science and Research, with Rutgers University researchers, evaluated microplastic concentrations across four municipal Wastewater Treatment Plants (WWTPs) and receiving water bodies.
• Findings: The study identified particles ranging in size from 140 µm to 5,000 µm in wastewater. Influent entering the plants averaged 33 microplastic particles per liter, and the plants removed 84–93% of microplastics by the end of treatment, with treated effluent averaging about 1.4 particles per liter. Nearby surface waters averaged between 1.0 (upstream) and 1.5 (downstream) microplastic particles per liter, showing that treated discharge and stormwater runoff continually introduce synthetic polymers into New Jersey’s rivers and watershed systems; the most common polymers identified in the wastewater itself were polypropylene (35%) and polyester (23%).

Summary and Practical Takeaways

1. Tap water contains significantly fewer microplastic particles than bottled water. Bottled water packaging sheds substantial quantities of micro- and nanoplastics into the liquid.
2. Reverse Osmosis (RO) and sub-micron Carbon Block filters (0.5 µm absolute) are the most effective home filtration methods for capturing microscopic plastic debris.
3. A microplastics certification does exist — look for a Microplastics Reduction claim under NSF/ANSI 401, verified in the certifier’s directory, or a certified Class I particulate reduction (0.5–1 µm) under NSF/ANSI 42, or an RO system, for the strongest documented performance.

Hi, I’m Steve. If you’ve spent any time reading around iPhilter, you know my goal as an independent New Jersey water guide is pretty simple: I’m here to give you straightforward, plain-English facts about what’s in your water, without any sales pitches or fearmongering. Water quality can feel like a complicated topic, but when you break down the science and standards into clear terms, it becomes much easier to understand what’s happening at your tap and what options you have as a homeowner.

For years, if you walked down the filter aisle at a hardware store or scrolled through water purifiers online, you might have seen a box claiming the system “reduces glyphosate.” Until recently, that claim had a big catch: there was no official, standardized, independent testing method behind it. A manufacturer could make the claim, but as a consumer, you had no reliable way to verify whether that filter actually did the job under rigorous laboratory conditions.

On October 14, 2026, that finally changed.

For the first time, an independent standard exists to test and certify water filtration products specifically for glyphosate reduction. Let’s take a look at what glyphosate is, how it ends up in water supplies, what the science and regulations say, and what this new test standard means for your home.

What Is Glyphosate and Where Does It Come From?

Glyphosate is best known as the active ingredient in Roundup, and it is currently the most widely used herbicide in the world.

Because it is so effective at controlling weeds and unwanted vegetation, its use is widespread across both agricultural and everyday consumer settings:

• Agriculture: Farmers apply glyphosate extensively on agricultural fields to keep crops clear of competing weeds.
• Residential Lawns and Gardens: Homeowners use it around garden beds, driveways, sidewalks, and patio cracks.
• Landscaping and Infrastructure: Landscapers, municipal crews, and groundskeepers use it along fence lines, park paths, roadsides, and railway corridors.

Because it is applied so broadly across both rural farmlands and suburban neighborhoods, glyphosate is present in many environments where rainwater falls.

How Glyphosate Gets Into Drinking Water

Unlike some industrial contaminants that enter water systems through underground leaks or factory pipes, glyphosate primarily makes its way into drinking water through surface runoff.

Here is how that process typically works:

• Application: Glyphosate is sprayed onto target plants, soil, or paved surfaces across farms, residential lawns, roadsides, and railways.
• Rain Events: When rainfall occurs, stormwater washes over these treated surfaces, picking up unabsorbed herbicide residues.
• Transport to Waterways: This runoff flows into storm drains, drainage ditches, streams, and rivers, eventually reaching reservoirs, lakes, and rivers that serve as source water for public water utilities.
• Soil Infiltration: In some local conditions, surface water carrying these residues can also percolate into shallow groundwater aquifers.

Because runoff is the primary route, levels in raw water sources can fluctuate depending on season, rainfall timing, and local spraying schedules.

The Health Picture: Understanding the Ongoing Debate

When learning about any weed killer or chemical in drinking water, it is completely natural to wonder about health effects. In the case of glyphosate, international health and regulatory agencies have reached different conclusions based on their evaluations of the scientific literature.

It is important to look at both perspectives calmly and honestly, without panic or dismissal:

• The World Health Organization (WHO): The International Agency for Research on Cancer (IARC), which is the specialized cancer agency of the WHO, evaluated the scientific data and classified glyphosate as “probably carcinogenic to humans.”
• The U.S. Environmental Protection Agency (EPA): The U.S. EPA has maintained a different position, concluding that glyphosate is not likely to be carcinogenic to humans at normal expected exposure levels.

Because scientific evaluations, long-term health studies, and legal discussions are ongoing, public health experts continue to monitor and debate the research. As independent educators, our goal at iPhilter is not to take a side in this agency debate, but to present the facts transparently so you understand where the scientific landscape stands today.

Federal Rules and the Old Testing Problem

To understand why the new testing standard matters, it helps to understand how glyphosate has been regulated up until now.

The Federal Limit

In the United States, the federal drinking-water limit—known as the Maximum Contaminant Level (MCL)—for glyphosate is set by the EPA at 0.7 mg/L (milligrams per liter). Public water suppliers are required to monitor their supplies and ensure treated drinking water meets or stays below this regulatory threshold.

The Filter Claim Loophole

While public water utilities manage supply-side compliance, many homeowners look to point-of-use or point-of-entry water filters for an extra layer of peace of mind.

However, until recently, if a filter manufacturer printed “reduces glyphosate” on their packaging, there was no standardized, independent protocol to evaluate that claim. A filter might have been tested under in-house company conditions, but there was no universal benchmark that allowed consumers to verify if the claim held up under standardized, rigorous third-party testing.

The New Standard: What NSF Protocol P549 Changes

That testing gap was officially closed on October 14, 2026, when NSF introduced Protocol P549.

NSF Protocol P549 is the very first standard in the world designed specifically to validate glyphosate reduction claims for water filtration products. It establishes a clear, independent protocol for testing products in a laboratory setting.

Here are the key details of how Protocol P549 works:

• A Stricter Performance Benchmark: Under P549, a filtration system cannot just reduce some glyphosate—it must demonstrate that it reliably reduces glyphosate in the water down to 0.28 mg/L or lower to pass. This 0.28 mg/L benchmark is significantly stricter and more health-protective than the federal drinking-water limit of 0.7 mg/L.
• Alignment with Established Standards: Protocol P549 was created to align directly with existing, widely trusted filtration standards: NSF/ANSI 53, the standard governing filtration systems designed to reduce specific health-related contaminants (such as heavy metals or VOCs), and NSF/ANSI 58, the standard governing point-of-use reverse osmosis (RO) systems.
• Independent Verification: NSF provides independent certification under P549. This means when a manufacturer claims their product is “certified to NSF P549,” consumers can independently look up and verify that certification in public databases.

Treatment Methods and What Readers Should Look For

If you are evaluating filtration technologies for your home, Protocol P549 recognizes two primary treatment methods for reducing glyphosate:

• Activated Carbon (Adsorption): Filtration systems using specialized activated carbon block or media filters capture glyphosate molecules as water passes through, binding them to the carbon surface.
• Reverse Osmosis (Membrane Separation): Point-of-use reverse osmosis systems force water through a semi-permeable membrane that physically blocks dissolved compounds like glyphosate from passing into your drinking water.

What This Means for You as a Consumer

If glyphosate reduction is something you want in your home water treatment setup, you no longer have to rely on unverified marketing language.

When shopping for a system, look for clear, certified claims. Check the product documentation or official listings to ensure the filter is explicitly certified to NSF P549. That certification mark confirms that the system has been independently tested and proven to bring glyphosate levels down below the strict 0.28 mg/L standard.

Summary & Next Steps

Having clear standards makes managing home water quality straightforward. Here is a quick summary of where things stand with glyphosate:

• What it is: The world’s most widely used herbicide, found in agricultural, residential, and municipal weed control products.
• How it enters water: Rain runoff washes herbicide residues from crops, lawns, roadsides, and railways into surface streams, rivers, and reservoirs.
• The Health Landscape: International health bodies disagree—IARC classifies it as a probable carcinogen, while the EPA maintains it is not likely carcinogenic at normal exposure levels.
• The Federal Rule: The federal drinking-water limit (MCL) is 0.7 mg/L.
• The New Standard: On October 14, 2026, NSF launched Protocol P549—the world’s first independent standard for glyphosate reduction in water filters, requiring systems to reduce glyphosate to 0.28 mg/L or lower.
• Effective Technologies: Adsorption through activated carbon and reverse osmosis are the recognized treatment methods under the protocol.

If you ever have questions about reading a water quality report, checking product certifications, or finding the right filter setup for your home, feel free to explore our other guides here on iPhilter. We are always here to help you navigate your water quality with plain facts and neighborly advice.

check the pH, then filter.

Hi, I’m Steve. If you’ve spent any time reading around iPhilter, you know my goal as an independent New Jersey water guide is pretty simple: I’m here to give you straightforward, plain-English facts about what’s in your water, without any sales pitches or fearmongering. Water quality can feel like a complicated topic, but when you break down the science into clear terms, it becomes much easier to understand what’s happening at your tap and what options you have as a homeowner.

Today, I want to talk about a specific compound that has been making news in environmental science circles: trifluoroacetic acid, or TFA.

You may already be familiar with the broader family of compounds known as PFAS, often called “forever chemicals.” While most discussions about PFAS focus on larger molecules used in manufacturing or firefighting foams, TFA represents a very different side of the same family. It is a chemical that forms high up in the air, falls with the rain, and presents unique challenges when it comes to testing and filtration.

Let’s take a look at what TFA is, how it gets into our water supply, what scientists are finding right here in New Jersey, and what it means for your home.

What Is TFA?

TFA stands for trifluoroacetic acid. In the chemistry world, it is classified as an ultra-short-chain PFAS. In fact, it is the smallest of the “forever chemicals.”

To understand why its size matters, it helps to think of the PFAS family as a group of chains. Longer-chain PFAS—like PFOA or PFOS, which you might have heard about in national news—have longer backbones of carbon atoms bonded to fluorine. TFA, on the other hand, has a very short carbon chain.

Because of this ultra-short structure, TFA behaves quite differently from its larger chemical cousins:

• It is extremely water-soluble: TFA dissolves easily in water and mixes thoroughly, making it mobile in the environment.
• It is remarkably stable: Like other PFAS, the bond between carbon and fluorine in TFA is incredibly strong. As a result, TFA is extremely persistent—it does not break down meaningfully in the environment. Over time, as more of it is introduced into the water cycle, levels can gradually build up in surface waters and groundwater.
• It travels lightly: Because it is small and soluble, it moves readily through soils and waterways rather than clinging to sediment.

Understanding these physical traits helps explain how TFA gets into our water in the first place—and why standard filtration tools view it differently than longer-chain PFAS.

How TFA Gets Into Our Water: The Skyward Cycle

Unlike many industrial chemicals that enter local water supplies through direct spills, manufacturing discharge, or landfill leachate, TFA often takes a scenic route through the atmosphere.

Here is how it forms and spreads:

• Atmospheric Breakdown of Fluorinated Gases: Modern industrial societies use various fluorinated gases in everyday applications, most notably as refrigerants in air conditioning systems, heat pumps, and commercial cooling. When these gases escape into the atmosphere, solar radiation and chemical reactions break them down. One of the primary breakdown products of these gases is TFA.
• Precipitation: Once TFA forms in the atmosphere, it binds with moisture in the air. When it rains or snows, that TFA comes back down to earth, landing on lakes, rivers, reservoirs, and open soil.
• Pesticides and Pharmaceuticals: Beyond atmospheric gases, TFA also forms from the environmental degradation and breakdown of certain fluorinated agricultural pesticides and pharmaceutical compounds.
• Accumulation in Water Supplies: Because TFA does not break down in the environment once it hits the ground, it washes into streams or seeps into underground aquifers, accumulating slowly over time.

Because atmospheric rain is a primary vector, TFA is widespread and not limited solely to areas near heavy manufacturing plants or industrial sites.

What Testing Shows in New Jersey

To understand how widespread TFA might be in our local supply, researchers at the New Jersey Institute of Technology (NJIT) screened tap water from across the state — 70 samples, covering all 21 New Jersey counties — in the first statewide U.S. monitoring study of ultra-short-chain PFAS (published in Environmental Science & Technology Letters, September 2026).

The findings were revealing: researchers found TFA in 64 of the 70 tap water samples — more than 91% — with at least one detection in every county. Among the samples where TFA turned up, the typical (median) level was 352 nanograms per liter, and the highest was 1,360 ng/L. Levels ran higher in several northern counties — Essex, Hudson, and Bergen. The same team also found TFA in nearly 80% of the bottled beverages they tested — and the 12 formulated drinks in the sample (sports drinks and electrolyte waters) averaged about 52 times the TFA of the plain bottled waters, with the top result at 94,100 ng/L — a reminder that this compound moves through the whole water cycle, not just the tap.

These results highlight a key reason why TFA is receiving more attention from water quality experts:

• It skips standard testing panels: Because TFA is much smaller and more water-soluble than the longer-chain PFAS that regulators and utilities routinely monitor, standard PFAS testing panels generally do not catch it. Finding TFA requires specialized laboratory testing methods specifically tuned for ultra-short-chain compounds.
• It is widely present: The high detection rate in the NJIT screening demonstrates that TFA is a common feature of tap water across our region, reflective of its atmospheric origin and environmental persistence.

Regulations and Health Research: Where Things Stand

When learning about any newly highlighted compound in drinking water, it is natural to ask: What are the legal limits, and what does the health science say?

It is important to look at both of these questions clearly and calmly.

Regulatory Status

Currently, there is no federal drinking-water limit—known as a Maximum Contaminant Level (MCL)—for TFA in the United States. While federal regulators have set limits for certain long-chain PFAS (such as PFOA and PFOS), ultra-short-chain compounds like TFA are not currently regulated under federal primary drinking water standards.

Health Research

Scientific research on the health effects of TFA, particularly at the low concentration levels typical of drinking water, is active and ongoing.

Because science takes time to build a complete picture, it is best to view the research honestly:

• Harm at typical tap-water exposure levels has not been definitively proven in human epidemiological studies.
• Absolute safety at lifetime low-level exposure has also not been conclusively established, which is why scientists continue to study how short-chain PFAS interact with biological systems over long periods.

As independent educators, our role at iPhilter is not to make health claims or predict future science, but to share where the current research and regulatory standards stand today so you can make informed choices for your home.

Water Filtration: What Works and What Doesn’t

If you are looking into water treatment options for your home, it is crucial to match the right filtration technology to the specific chemical you want to address. Because TFA has unique physical properties, standard filtration methods do not react to it the same way they do to longer-chain PFAS.

Activated Carbon and Ion Exchange

Media filters like activated carbon (found in standard pitcher filters, refrigerator filters, and many whole-house systems) and ion-exchange resins are very effective at capturing longer-chain PFAS chemicals. Those larger molecules stick readily to the surface of carbon or bind to resin beads.

However, because TFA is so small, highly water-soluble, and polar, it binds poorly to activated carbon and ion-exchange resin media. As a result, these traditional filters are generally not designed to reliably capture TFA.

Reverse Osmosis (RO)

The effective home treatment option for removing TFA is reverse osmosis.

Reverse osmosis systems work by forcing water under pressure through a semi-permeable membrane with extremely microscopic pores. Rather than relying on chemical binding (like carbon), RO relies primarily on size exclusion and membrane separation. Because the membrane barrier is tight enough to separate dissolved ions and tiny molecules from water, RO systems can successfully reduce ultra-short-chain compounds like TFA from drinking water.

What To Do at Home

• If you want to know your own number, test with a specialized lab — and ask specifically for ultra-short-chain PFAS analysis. A standard PFAS panel will not report TFA.
• For drinking and cooking water, an under-sink reverse osmosis system is the treatment that works on TFA. Don’t count on a pitcher or refrigerator filter for this one — carbon doesn’t hold it.
• Keep perspective: TFA showed up in most New Jersey taps at very low levels, there is no federal limit yet, and the health research is still developing. Test, treat the water you drink, and stay informed as the science firms up.

Summary & Next Steps

Understanding what goes into our drinking water is all about clarity. Here is a quick recap of the facts regarding TFA:

• What it is: TFA (trifluoroacetic acid) is the smallest ultra-short-chain member of the PFAS chemical family.
• Where it comes from: It forms mainly in the atmosphere from the breakdown of fluorinated gases (like refrigerants) and falls in rain, as well as from the breakdown of certain pesticides and pharmaceuticals.
• Persistence: It does not break down naturally in the environment, leading to gradual buildup in water sources over time.
• Local presence: An NJIT screening found TFA in more than 91% of tested tap water samples in New Jersey — every county.
• Testing & Regulation: It requires specialized testing to detect, is omitted from standard PFAS panels, and currently has no federal MCL.
• Treatment: Due to its small size and high solubility, TFA binds poorly to carbon and ion-exchange filters; reverse osmosis is the effective home treatment method for it.

If you ever have questions about reading a water quality report, understanding testing options, or choosing home filtration equipment that fits your needs, feel free to explore our guides here on iPhilter. We are always here to help you navigate your water quality with plain facts and neighborly advice.

check the pH, then filter.

If there’s a dry cleaner anywhere near your well — especially an older one — this article is for you. Perchloroethylene, PCE for short, is the dry-cleaning solvent, and it has a long history of finding its way into groundwater.

What it is. Perchloroethylene (also called tetrachloroethylene, PCE, or “perc”) is a manufactured chlorinated solvent — a clear, colorless liquid that evaporates easily and carries a mild, sweet, chloroform-like odor. It is used mostly in dry cleaning and textile processing, with smaller uses in metal degreasing and chemical manufacturing. Like its cousins TCE and vinyl chloride, it’s a volatile organic compound — and like them, it’s denser than water, so spilled PCE sinks deep into aquifers and lingers for decades.

Where it comes from. Dry cleaners, first and foremost — decades of small spills, leaky machines, and improper disposal add up. Metal degreasing shops, chemical plants, and old industrial sites round out the list. And here’s the family connection: PCE breaks down very slowly underground into TCE, then into dichloroethylene (DCE), and then into vinyl chloride — so a PCE plume can generate its more dangerous relatives over time.

The health picture, honestly. The EPA’s health goal (MCLG) for PCE is zero, because the EPA classifies PCE as likely to be carcinogenic to humans. The legally enforceable limit (MCL) is 0.005 mg/L — 5 parts per billion. Drinking water with PCE above that limit over many years could lead to liver problems and an increased risk of cancer. Short-term exposure to high concentrations can affect the nervous system. And because PCE is volatile, showering and bathing add inhalation to the exposure — which is why this one is a whole-house conversation, not just a kitchen-sink one.

How to test. A lab VOC test (EPA Method 524.2) from a state-certified drinking water laboratory — basic home test strips will not work. The lab will give you specialized glass vials designed for volatile organic compounds, so the chemical doesn’t evaporate before analysis. City water folks: check your annual water quality report. Well owners within sight of a dry cleaner — current or long-closed — should test. Old cleaners are the gift that keeps on giving.

What removes it. Granular activated carbon and aeration are the EPA’s best available technologies for PCE. Solid carbon block filters certified for VOC reduction take it out at the tap, and reverse osmosis systems with carbon pre- and post-filters also remove it. At the city scale, treatment plants use air stripping (packed tower aeration) or granular activated carbon.

What does NOT remove it. Standard pitcher filters, basic refrigerator cartridges, and simple sediment filters will not reliably capture PCE. Water softeners, UV, and chlorine don’t remove it either. And boiling is not a fix: PCE evaporates easily, so boiling can drive it out of the water and into the air you breathe. A point-of-use filter at the kitchen sink also leaves the shower untouched — and with a volatile solvent, the shower matters.

What I’d buy: Treatment type: whole-house granular activated carbon filtration at the point of entry, NSF or WQA listed — with aeration ahead of it if your test numbers are high — plus an under-sink carbon block or reverse osmosis system certified for VOC reduction for drinking water. Retest after install and on a schedule; carbon exhausts, and you need to know when.

PCE is the quiet legacy of every strip-mall dry cleaner that ever spilled a bucket. But carbon and aeration take it out reliably. Test if there’s any history near your well, treat the whole house, verify.

Curious what’s in your tap? Start with What’s In Your Water?

Every summer, lakes and reservoirs across the country turn green with algal blooms — and some of those blooms produce cyanotoxins, potent natural poisons that can end up in tap water. Toledo learned this the hard way in 2014, when half a million people were told not to drink their water.

What they are. Cyanotoxins are toxins produced by cyanobacteria — “blue-green algae,” though they’re actually bacteria. The main ones in drinking water: microcystins (liver toxins, the most common), cylindrospermopsin (liver and kidney), anatoxin-a (a fast-acting neurotoxin), and saxitoxins. They’re dissolved chemicals, not living organisms — killing the algae doesn’t remove the toxins.

Where they come from. Nutrient-polluted surface water — farm fertilizer runoff and sewage feed the blooms, warm still water grows them. Any utility drawing from a lake or reservoir in farm country can face a bloom season. This is a surface-water story, and it’s getting worse as waters warm.

The health picture, honestly. Microcystins attack the liver; acute exposure causes vomiting, diarrhea, and liver damage. There’s no federal MCL — the EPA has health advisories instead: 0.3 parts per billion of microcystins for young children, 1.6 ppb for everyone else, for short-term exposure. When a bloom hits, utilities issue do-not-drink advisories. Take them seriously.

How to test. Specialized lab testing for microcystins — not a home test-kit item. Practically: watch your utility’s bloom-season notices. If your water comes from a reservoir and the lake looks like pea soup, pay attention to advisories before you pay for a lab.

What removes them. Activated carbon — powdered or granular — adsorbs dissolved microcystins effectively, though the carbon must be fresh and properly sized; exhausted carbon stops working. Reverse osmosis removes them. Ozone destroys them. NSF P477 is the certification for microcystin reduction — look for it specifically. For homeowners during a bloom event, an RO unit plus fresh carbon is the practical defense.

What does NOT remove them. Boiling — and this is critical, because boiling does NOT destroy cyanotoxins and prolonged boiling concentrates them as water evaporates. Most camping filters and standard home filters are not effective. Chlorine alone is unreliable. Killing the algae with algaecide can actually make things worse by bursting the cells and releasing more dissolved toxin.

What I’d buy: Treatment type: an under-sink reverse osmosis unit, NSF listed, plus fresh activated carbon — the practical home defense during bloom season. But the honest primary advice: obey do-not-drink advisories. No home filter replaces that.

Cyanotoxins are the reminder that “natural” doesn’t mean safe — these are among the most potent natural poisons known. Watch the bloom reports, heed the advisories, and keep RO plus fresh carbon as your backup.

Curious what’s in your tap? Start with What’s In Your Water?

Trihalomethanes get most of the attention, but they’re only half the disinfection-byproduct story. The other half is haloacetic acids — HAA5, the group of five — formed the same way, by the same chlorine, carrying their own cancer risk.

What they are. Haloacetic acids are a group of five related compounds formed when chlorine (or chloramine) reacts with natural organic matter in the water. Unlike trihalomethanes, they’re not volatile — they don’t evaporate, they don’t off-gas in the shower. They stay in the water, which makes them an ingestion concern: drinking and cooking.

Where they come from. Same origin as TTHMs — disinfection doing its job. Chlorine meets organic matter, byproducts form, and they ride the distribution system to your tap. Levels run highest in warm months and in surface-water systems. Another city-water story.

The health picture, honestly. Long-term exposure above the legal limit carries an increased risk of cancer — that’s the EPA’s stated concern. The legal limit is 60 parts per billion (0.060 mg/L). Note the difference from TTHMs: because HAA5 isn’t volatile, the shower isn’t the exposure route — the glass is.

How to test. Your utility’s annual water quality report lists HAA5 right alongside TTHMs. Independent labs run it too. And like TTHMs, if your utility has sent violation notices, they’re telling you the numbers already.

What removes them. Activated carbon — point-of-use carbon adsorbs haloacetic acids, though it loads up and breaks through as the bed fills, so filter changes matter more here than usual. A quality under-sink carbon block system handles the drinking and cooking water. Whole-house carbon helps too.

What does NOT remove them. Boiling won’t touch them (they’re not volatile). Water softeners, UV, and standard pitcher filters aren’t the answer. And don’t assume your TTHM treatment automatically covers HAA5 — check what the system is actually rated for.

What I’d buy: Treatment type: an under-sink carbon block system, NSF listed, for drinking and cooking water — with disciplined filter changes, because carbon loads up on HAA5 and loses effectiveness as it fills. If TTHMs are also on your report, a whole-house carbon system covers both at once.

HAA5 is the quiet half of the disinfection-byproduct pair — no smell, no shower vapor, just in the glass. Carbon filtration handles it. Read your utility’s report, treat the drinking water, change the filters on time.

Curious what’s in your tap? Start with What’s In Your Water?

This one has the lowest legal limit of any volatile organic chemical on the EPA’s list — 2 parts per billion — and there’s a reason. Vinyl chloride is a known human carcinogen, and the cancer it causes is liver cancer.

What it is. Vinyl chloride is a colorless gas used to make PVC — polyvinyl chloride, the plastic in pipes, siding, and countless products. It’s also what TCE and PCE turn into when they break down underground, which means old solvent plumes can generate vinyl chloride years after the original spill.

Where it comes from. Three routes: industrial discharge from plastics and chemical plants, leaching from PVC pipes (especially older ones), and the breakdown of other chlorinated solvents already sitting in the groundwater. That last one catches people off guard — you investigate a TCE spill and find vinyl chloride where the TCE used to be.

The health picture, honestly. Liver cancer is the headline — the evidence from workers and animal studies is solid. At high exposures it’s also tied to liver damage and nerve effects. The EPA set the legal limit at 2 ppb with a health goal of zero — and even that 2 ppb reflects what labs can reliably measure, not a level where risk disappears. Keep it as low as you can get it.

How to test. Same playbook as the other VOCs: a lab test (EPA Method 524.2 or 502.2) from a state-certified lab. City water folks, check the annual water quality report. Well owners near industrial areas, old dry cleaners, or anywhere with a solvent history — test.

What removes it. Granular activated carbon and aeration — the EPA’s best available technologies for vinyl chloride. A whole-house GAC system at the point of entry, with aeration ahead of it when test numbers run high.

What does NOT remove it. Pitcher filters. Boiling — it just drives a volatile chemical into the air. Water softeners, UV, chlorine. Same story as its solvent cousins: this is a whole-house problem.

What I’d buy: Treatment type: whole-house granular activated carbon filtration, NSF or WQA listed, at the point of entry — with aeration ahead of it if your numbers are high. Retest after install and on a schedule. Carbon has a lifespan, and you need to know when it’s spent.

Vinyl chloride doesn’t give you a second warning — by the time you know it’s there, it’s been there a while. Test if the history around your well gives you any reason at all. Then treat the whole house and verify.

Curious what’s in your tap? Start with What’s In Your Water?

Atrazine is the most widely used herbicide in America — tens of millions of pounds a year, mostly on corn — and the pesticide most frequently detected in tap water. If you live in farm country, this one’s for you.

What it is. Atrazine is a herbicide in the triazine family, used since 1959 to kill weeds in corn, sorghum, and sugarcane. It’s an endocrine disruptor — it interferes with hormones — which is what makes it controversial well beyond the usual pesticide concerns. Animal studies link it to reproductive and developmental effects, including feminization of males; some epidemiological studies associate it with certain cancers.

Where it comes from. Runoff from treated fields into lakes, streams, and rivers, plus leaching through soil into groundwater. Levels spike in spring and early summer after application — and here’s the regulatory gap: utilities aren’t required to test during those spikes, so the official averages can hide the worst weeks. The Corn Belt states — Illinois, Iowa, Indiana, Kansas, Missouri, Nebraska, Ohio — carry the heaviest load.

The health picture, honestly. The EPA’s legal limit is 3 parts per billion, and several independent studies report hormonal effects below that line — California’s public health goal is 0.15 ppb, twenty times lower. I’m not going to tell you the legal limit is a safety guarantee here. It’s a regulatory compromise. If atrazine concerns you, treat below the MCL, not to it.

How to test. A lab pesticide panel (EPA Method 525.2 or similar) from a state-certified lab — test in late spring or early summer when levels peak, not in winter when they’re lowest. Your utility’s annual report lists atrazine if they found it. The EWG Tap Water Database shows what’s been detected in your zip code.

What removes it. Granular activated carbon — the EPA’s best available technology for atrazine, and genuinely effective. A whole-house GAC system or a quality under-sink carbon block both work. Reverse osmosis and distillation remove it too. Note that conventional municipal treatment (coagulation, settling, sand filtration) does NOT remove atrazine — that’s why it shows up in tap water in the first place.

What does NOT remove it. Boiling, UV, chlorine, water softeners, standard pitcher filters. Your utility’s standard treatment train, as noted above.

What I’d buy: Treatment type: an under-sink carbon block system, NSF listed for pesticide/chemical reduction, for drinking and cooking water — or whole-house granular activated carbon if your test numbers run high. Change carbon on schedule; pesticides load it up like everything else.

Atrazine is the poster child for “legal isn’t the same as safe.” Know your area, test in the right season, and filter with carbon that you actually maintain.

Curious what’s in your tap? Start with What’s In Your Water?

This is the contaminant that slips through almost everything. 1,4-Dioxane is a likely human carcinogen with no federal drinking-water limit yet — and it’s one of the hardest chemicals in water to remove. If your area has industrial history, read on.

What it is. 1,4-Dioxane is a clear liquid solvent used in manufacturing — historically as a stabilizer in chlorinated solvents, and as a byproduct impurity in consumer products made with ethoxylated ingredients (anything with “-eth” or “-oxynol” on the label: detergents, shampoos, cosmetics). It’s highly soluble in water, doesn’t break down easily, and moves fast through groundwater.

Where it comes from. Industrial sites — degreasing operations, chemical plants, landfills, and anywhere chlorinated solvents were used or dumped. Because it was a stabilizer in solvents like TCA, it rides along with old solvent plumes. It was detected in nearly 1 in 5 public water supplies tested in one national survey.

The health picture, honestly. The EPA classifies 1,4-dioxane as “likely to be carcinogenic to humans” by all routes of exposure, based on liver and nasal cancers in animal studies. There’s no federal MCL — it’s officially a “contaminant of emerging concern” and a likely candidate for future regulation. The EPA’s screening level is 0.35 ppb, the concentration tied to a one-in-a-million lifetime cancer risk. The states are moving first: New York set the nation’s first MCL at 1 ppb in 2020, and California’s notification level is 1 ppb too. The honest position: minimize exposure.

How to test. Specialized lab testing (EPA Method 522) — not every local lab runs it, so ask before you ship a sample. City water folks, check whether your utility participated in federal monitoring and what they found.

What removes it. This is where it gets difficult. Advanced oxidation — UV light combined with hydrogen peroxide (or ozone) — is the most effective treatment, destroying 1,4-dioxane outright with removal above 99% at the municipal scale. Specialty synthetic sorbent resins work at the remediation scale. Home options are honestly limited: reverse osmosis is inconsistent for this small, highly soluble molecule — some systems cut levels, some barely touch it, and no RO rating guarantees dioxane removal.

What does NOT remove it. Standard activated carbon — 1,4-dioxane’s small size and neutral charge mean it barely adsorbs; GAC managed under 20% removal in pilot testing. Pitcher filters, boiling, water softeners, UV alone (without the oxidation chemistry), chlorine. This is the rare contaminant where “just get a carbon filter” is genuinely wrong advice.

What I’d buy: Treatment type: start with the test, not a purchase. If your levels come back low, an under-sink reverse osmosis unit may reduce them further — but it isn’t a guarantee. If your levels are high, advanced oxidation is the proven technology, and that’s a conversation with a water treatment professional, not a filter-and-hope buy.

1,4-Dioxane is the frontier of drinking-water contamination — unregulated, hard to remove, and more common than anyone thought. The science and the standards are still catching up. Until they do: test first, know your number, and match the treatment to it.

Curious what’s in your tap? Start with What’s In Your Water?

Cadmium is the heavy metal nobody talks about — no headlines, no Erin Brockovich movie. But it has a legal limit three times lower than lead’s old action level, and it goes straight for your kidneys.

What it is. Cadmium is a soft, bluish-white metal used in batteries, pigments, metal coatings, and plastics. Your body has no use for it at all — unlike copper or iron, there’s no “essential trace amount.” Any cadmium in your water is unwelcome.

Where it comes from. The number-one household source: corrosion of galvanized steel pipes — the zinc coating on old galvanized plumbing contains cadmium, and acidic water leaches it out. Beyond the house: erosion of natural deposits, discharge from metal refineries, and runoff from waste batteries and paints. If your home has galvanized plumbing and low-pH water, you’re in the highest-risk category.

The health picture, honestly. Kidneys first — cadmium accumulates there and damages them with chronic exposure. Long-term exposure is also linked to fragile bones and lung damage. Short-term high doses cause nausea, vomiting, and cramps. The EPA’s legal limit is 5 parts per billion (0.005 mg/L), and the health goal is set at the same level — no margin built in.

How to test. A lab metals panel from a state-certified lab — cadmium rides along on the standard heavy-metals screen. Homes with galvanized pipes should test a first-draw sample (water that’s sat overnight). City water folks, check the annual report.

What removes it. Reverse osmosis, ion exchange, and distillation all take cadmium below the legal limit — the EPA lists coagulation/filtration, ion exchange, lime softening, and RO as proven methods. NSF-53 listed filters cover cadmium. If galvanized pipes are the source, replacing the plumbing is the permanent fix; filtration handles the water in the meantime.

What does NOT remove it. Boiling (concentrates it). Standard pitcher filters, water softeners alone, UV, chlorine.

What I’d buy: Treatment type: an under-sink reverse osmosis unit, NSF listed, for drinking and cooking water. If your pipes are galvanized, plan the repipe as the real fix — but don’t drink the water unfiltered while you plan.

Cadmium is a quiet contaminant — no taste, no stain, no smell. But old galvanized plumbing plus acidic water is a combination worth checking. A metals panel is cheap. Knowing is cheaper than not knowing.

Curious what’s in your tap? Start with What’s In Your Water?