Author: iPhilter

Fluoride might be the most argued-about thing in drinking water. One side calls it a public-health triumph that prevents cavities; the other side wants it out of the water completely. Both sides are loud — and if you’re stuck in the middle, it’s hard to know what to believe.

So let’s clear it up: they’re arguing about different doses. At 0.7 milligrams per liter — the level U.S. health authorities recommend for community water systems — fluoride prevents tooth decay, and that’s well supported. At much higher levels, it does real harm: stained, pitted teeth in kids, and stiff, painful joints over decades. Same substance, different dose. Dose is the whole argument.

This article is about the high end — too much fluoride — because that’s the end where filtration matters. Nobody needs a filter for 0.7 mg/L.

What it is

Fluoride is a naturally occurring mineral — one of the most abundant elements on earth. It gets into water two ways: it dissolves out of rock and soil into groundwater, or a water utility adds it deliberately to prevent tooth decay. About two-thirds of Americans on public water systems drink fluoridated water.

Where too much comes from

Mostly geology. In regions with fluoride-rich rock formations — parts of Texas, the Southwest, and scattered pockets elsewhere — private wells can test at 2, 3, even 4+ mg/L straight out of the ground. On public water, utilities target 0.7 mg/L, so excess fluoride is mainly a private-well story.

The health picture, honestly

Three numbers matter. At 0.7 mg/L, you’re in the cavity-prevention zone — that’s the target. At 2.0 mg/L — the EPA’s secondary standard — children under nine can develop dental fluorosis: white streaks, brown staining, or pitting of the teeth as they form. It’s cosmetic, but it’s permanent. At 4.0 mg/L — the EPA’s enforceable legal limit — decades of exposure can cause skeletal fluorosis: stiff, painful joints and, in severe cases, weakened bones. That’s the line the law draws, and it’s there for a reason.

How to test

If you’re on city water, your utility’s annual water quality report lists the fluoride level — look it up before spending a dime. On a private well, get a lab test; fluoride is cheap to analyze and most state-certified labs run it for a few dollars. Home test strips exist but they’re rough estimates — fine for a first sniff, not for decisions.

What removes it

Here’s where I have to be blunt, because this is the trap: your standard pitcher filter does not remove fluoride. Not Brita-style carbon, not fridge filters, not faucet mounts — plain carbon doesn’t catch dissolved fluoride ions, period. What actually works:

• Reverse osmosis. The proven home answer — removes 80–99% of fluoride along with most everything else dissolved in the water. Under-sink unit, done.
• Distillation. Boils water and condenses the steam, leaving fluoride behind. Near-total removal, but slow and energy-hungry.
• Activated alumina. A specialty filter media that grabs fluoride ions. Effective (up to ~90%) but finicky — it wants slightly acidic water and regular media replacement.
• Bone char carbon. Charred animal bone — sounds odd, works well. Not for everyone, for obvious reasons.

What does NOT remove it

Standard carbon pitchers and filters. Water softeners. UV light. Chlorine. And boiling — boiling water down concentrates fluoride as the water evaporates. If your plan was “I’ll just boil it,” that’s backwards.

What I’d buy

Treatment type: an under-sink reverse osmosis unit — it’s the straightforward, proven way to take fluoride out of drinking and cooking water without turning it into a science project. Test first so you know your starting number, then retest after install to confirm where you landed.

The bottom line

Fluoride is one of those rare topics where both sides have a point: the right amount protects teeth, too much causes real harm. The answer isn’t fear — it’s a number. Get tested, know your level, and act on that instead of guessing.

Start here: What’s In Your Water? — learn how to read your water report and test your own tap.

If you grew up anywhere near factories, dry cleaners, or a military base, there’s a decent chance you’ve heard of this one. Trichloroethylene — TCE for short — is an industrial solvent that was used everywhere for decades: degreasing metal parts, dry cleaning, making refrigerants and adhesives. Some of the most famous water contamination cases in American history, like Camp Lejeune, involve TCE. The EPA restricted or banned most uses of it in 2024, but the stuff it spilled decades ago is still sitting in groundwater today. It breaks down slowly, so old messes are still old problems.

Here’s the thing about TCE: it’s a volatile organic compound. That means it doesn’t just stay in the water — it can evaporate out of it, including into the air inside a home from contaminated groundwater. So people near a plume can get exposed through drinking water, through showering in it, and through vapor getting indoors. Three ways in, not one. That matters when we talk about how to fix it.

The health picture

I’ll be straight with you, and I’ll frame this right: the International Agency for Research on Cancer lists TCE in Group 1. IARC groups are hazard classifications — they say whether something can cause cancer, not how much risk a given dose carries. Group 1 doesn’t mean “dangerous at any dose.”

With that understood: worker studies show higher rates of kidney cancer among people exposed to high levels of TCE over long periods, with some evidence for non-Hodgkin lymphoma and liver cancer too. High exposures can cause dizziness, headaches, nausea, confusion, and damage to the liver and kidneys. Animal studies link it to developmental effects, including fetal heart defects from exposure early in pregnancy. The EPA set the legal limit in public drinking water at 5 parts per billion, and its stated goal for TCE in drinking water is zero — meaning below the legal limit is fine, but less is always better.

How to test

TCE is a job for a lab, not a test strip. Ask for a VOC panel (EPA Method 524.2) from a state-certified lab. Who should test? If you’re on a private well anywhere near industrial sites, old factories, dry cleaners, or known cleanup sites, yes. If you’re on city water, your utility tests for it and reports the numbers in your annual water quality report — check what yours says. Private wells near known contamination areas are the real exposure stories with TCE.

What removes it

Good news: TCE is one of the contaminants where treatment is proven. Whole-house granular activated carbon filtration is the standard recommendation — state health departments point to carbon filtration first for residential TCE. For well water with significant contamination, aeration (packed tower aeration) is highly effective because TCE is volatile and wants to leave the water; utilities pair it with carbon to catch what’s left. Reverse osmosis also removes it. Whatever system you use, have it installed by a pro, retest after install, and keep up with filter changes — a saturated carbon filter stops doing its job.

What does NOT remove it

This is the important part. A water softener does nothing for TCE. UV light does nothing for it. Chlorine does nothing for it. And boiling? Boiling drives it into the air, which can turn a water problem into an air problem. A point-of-use pitcher on the kitchen counter is the wrong scale for a contaminant you can also absorb in the shower — TCE is a whole-house problem, not a drinking-glass problem.

What I’d buy

Treatment type: a whole-house granular activated carbon filter from a certified unit (NSF or WQA listed), installed at the point where water enters the home. For a private well with high TCE readings, point-of-entry aeration ahead of carbon is the proven combo. This one’s worth getting professional help for — get the water tested before and after, and retest on a schedule.

The bottom line

If you suspect TCE anywhere near your well, don’t guess. Test it, treat the whole house, and verify with retesting. Knowledge first, filter second — that’s always the order.

Start here: What’s In Your Water? — learn how to read your water report and test your own tap.

Radium is the one contaminant in this series that makes a Geiger counter click. Radium-226 and radium-228 are radioactive isotopes — real radiation, right in the glass — and they show up in drinking water more often than most people realize. No taste, no smell, no color. You cannot sense it. Only a lab test finds it.

So let’s talk about it straight: what it is, where it comes from, and what the risk actually looks like at the levels people drink.

What it is

Radium is a naturally occurring radioactive metal. It’s born when uranium and thorium — both present in small amounts in most rocks and soil — undergo radioactive decay. Two of its isotopes matter for drinking water: radium-226 and radium-228.

Here’s the detail that matters for your body: radium behaves chemically a lot like calcium. When you drink it, your body mistakes it for calcium and deposits it in your bones, where it sits and emits radiation into the surrounding bone tissue. That’s why the health concern is specifically bone cancer — along with other cancers linked to long-term exposure.

A quick framing note, since this series covers carcinogens: IARC (the International Agency for Research on Cancer) lists both radium-226 and radium-228 as Group 1 — “carcinogenic to humans.” That classification is about hazard: it says radium can cause cancer. It does not say how much risk a given exposure carries. Group 1 does not mean “dangerous at any dose.”

Where it comes from

Erosion of natural deposits — it’s geology, not industry. Deep wells pull from rock formations where radium dissolves into the water over time. Surface water and shallow wells typically have lower levels; deep wells have higher ones. Oil and gas extraction activities can also elevate concentrations in some areas.

This isn’t a rare edge case. USGS research found that in some regions — including the mid-continental U.S. and the North Atlantic coastal region, which includes parts of New Jersey — more than 20 percent of sampled wells had radium above the federal limit. If you’re on a private well in one of those regions, radium is not a hypothetical; it’s a routine test.

The health picture, honestly

The EPA’s numbers, plainly: the maximum contaminant level (MCL) for combined radium-226/228 is 5 picocuries per liter (pCi/L), and the health goal (MCLG) is zero — EPA doesn’t consider any level risk-free, just legally acceptable below the limit.

What does the legal limit mean in real risk? EPA estimates that 1 in every 10,000 people drinking water at the MCL for a lifetime would develop cancer. That’s the honest math: a real, nonzero risk, but not a large one at the legal limit. California, for reference, set its public health goal vastly lower — 0.05 pCi/L for radium-226 and 0.019 pCi/L for radium-228 — levels so low most lab tests can’t even detect them.

The risk scales with dose and time. A little above the limit for a year is a different story than five times the limit for twenty years. This is a long-term-exposure problem, not an acute-poisoning one.

How to test

There is no home strip for radioactivity. Radium is measured in picocuries per liter — a radioactivity measurement, not a chemical one — and it takes a lab. Most people test two ways:

• Gross alpha screening. Labs often start here: a general screen for radioactive particles. If gross alpha comes back elevated, you follow up with radium-specific analysis.
• Radium-226/228 analysis. The exact measurement the EPA limit is based on.

In New Jersey, radium screening is built into the process: the state’s Private Well Testing Act requires a gross alpha test when a property with a private well changes hands, so if you bought a house on well water here, you may already have a number on file. Either way, a certified lab is the only way to know your level. Utilities on public water are required to test for it, and the results are in your annual water quality report — check it before paying for anything.

What actually removes it

The good news: radium is one of the more straightforward contaminants to remove, because as an ion it responds to proven methods. Per the WQA fact sheet and EPA guidance:

• Cation exchange (a whole-house water softener). This is the standout: a standard ion-exchange softener removes radium the same way it removes calcium and magnesium — it’s all the same exchange process. One of the rare cases where “just a water softener” is a legitimate, proven treatment.
• Reverse osmosis. An under-sink RO unit removes radium from drinking and cooking water at the tap — solid choice if you only want to treat what you drink.
• Distillation and lime softening. Both effective, though distillation is slow and energy-hungry for household use, and lime softening is a utility-scale method.

What does NOT remove it

• Boiling. Does nothing for radium — if anything, boiling water down concentrates it as the water evaporates.
• Any carbon filter — pitcher, faucet, fridge, whole-house carbon block. Carbon does not remove dissolved radium ions. Zero effect.
• A sediment filter. Screens particles, not dissolved ions.
• UV sterilization. Kills microbes; does nothing about radioactivity.
• Chlorine or chlorination. Disinfects; doesn’t touch radium.

What I’d buy

Treatment type: a whole-house cation-exchange water softener — it’s one of the rare cases where the standard softener is the proven answer, treating every tap in the house for radium in one system. If you’d rather treat just your drinking water, an under-sink reverse osmosis unit is the proven point-of-use option. Either way, test first and confirm the treatment brought your combined radium-226/228 under the 5 pCi/L federal limit with a follow-up lab test.

The bottom line

Radium is invisible, tasteless, radioactive, and naturally in the ground — and it’s also one of the easier contaminants in this series to beat, because plain ion exchange works. The trap is never testing: the biggest risk isn’t the radium itself, it’s drinking it for decades without knowing. One lab test tells you where you stand. If you’re on a private well in radium country, that’s the single highest-value test you can run.

Start here: What’s In Your Water? — learn how to read your water report and test your own tap.

If your water smells like rotten eggs, you don’t have a mystery — you have hydrogen sulfide. It’s the most complained-about well water problem that isn’t actually dangerous. Here’s how to diagnose it and fix it.

What it is

Hydrogen sulfide (H₂S) is a gas dissolved in your water, produced when sulfur-reducing bacteria break down organic matter in low-oxygen environments — deep wells, water heaters, plumbing. Humans can smell it at absurdly low levels (around half a part per billion), which is why a tiny amount smells like a disaster. The smell is the whole problem at household levels: EPA has no primary drinking-water limit for it because typical concentrations aren’t a health threat. (At very high concentrations it’s genuinely toxic — that’s an industrial-safety issue, not a tap-water one.)

The one test that tells you where it’s coming from

Run the cold tap. Then run the hot tap. Smell both.

• Smell only in hot water: the problem is in your water heater, not your well. The magnesium anode rod (the sacrificial rod that keeps the tank from rusting) reacts with naturally occurring sulfate-reducing bacteria, making H₂S inside the tank. Common, fixable, and your well water is fine.
• Smell in cold water too: it’s coming from the well or the source water itself.

That thirty-second test saves people from buying whole-house treatment they don’t need. Hot-only smell? Start at the heater.

The honest health picture

At the levels found in household water, hydrogen sulfide is a nuisance — smell, taste, and it can tarnish silverware and corrode plumbing fixtures. It is not making you sick. Don’t let anyone sell you a treatment system on fear. Fix it for comfort and to protect your plumbing, not because it’s poisoning anyone.

What actually removes it

It depends on where it’s coming from:

Hot-water-only smell (water heater):

• Temporarily raise the heater to 160°F for a few hours to kill the bacteria, then flush (careful with scalding — turn it back down after).
• Chlorinate the heater and flush it.
• Replace the magnesium anode rod with a zinc-aluminum alloy rod, which produces far less sulfide gas.

Cold-water smell (well/source):

• Aeration — spraying or cascading the water through air strips the gas out. Simple, chemical-free, very effective.
• Oxidation + filtration — chlorine injection, hydrogen peroxide, or ozone converts H₂S to filterable sulfur particles, then a carbon or multimedia filter catches them.
• Manganese greensand filtration — oxidizes and filters in one unit.

What doesn’t

• A standard water softener — no. It swaps hardness minerals; the gas passes through.
• A plain sediment filter — no. Though here’s the micron-rating footnote: a 5-micron nominal sediment pre-filter is still worth having ahead of oxidation equipment, because sediment fouls treatment media. It protects the fix; it isn’t the fix.
• A standard carbon pitcher — no. Whole-house GAC after oxidation works; a pitcher doesn’t have the contact time.

Bottom line

Rotten-egg smell is hydrogen sulfide, it’s a comfort problem not a health crisis, and the hot-vs.-cold test tells you whether it’s a $30 anode rod or a well treatment system. Diagnose first, buy second.

Wondering what else might be in your water? Start with What’s In Your Water?

A positive bacteria test is the single most common reason a private well fails its water test. If you’ve ever gotten a lab report back with the word “coliform” on it, here’s what it actually means — and what it doesn’t.

What the test is really telling you

“Total coliform” is a family of bacteria used as an indicator, not a diagnosis. Most coliforms are harmless and live everywhere in soil and vegetation. Their presence in your water says: surface water or soil is getting in somewhere it shouldn’t — a cracked well cap, a failing septic, flooding, a well too close to a barnyard.

E. coli is the more specific one. It’s a type of fecal coliform — its presence means fecal contamination has reached your water, and where feces go, worse pathogens (Giardia, viruses, the dangerous E. coli O157:H7 strain) can follow. Most E. coli strains won’t hurt you. The test isn’t saying you’re drinking poison — it’s saying the door is open.

The honest health picture

A total-coliform positive with no E. coli: investigate and retest, don’t panic. An E. coli positive: stop drinking it until it’s resolved — switch to bottled or boiled water. People with weakened immune systems, infants, and the elderly should be the most cautious. This is straightforward stuff, not a scare story: bacteria in well water is common, well understood, and fixable.

What to do when a test comes back positive

• Retest to confirm — one bad sample can be a sampling error. Use a clean, sterile bottle and follow the lab’s instructions exactly.
• Inspect the wellhead. Cracked cap? Missing screen? Water pooling around the casing? Most bacterial problems start at the top of the well, not deep underground.
• Shock-chlorinate the well — a strong chlorine dose circulated through the whole system, then flushed. This is the standard first response and it works for one-time contamination events.
• Find the source. If positives keep coming back, something structural is wrong — septic too close, surface water intrusion, a compromised casing. Disinfection treats the symptom; the source needs fixing.

What truly disinfects water (and what doesn’t)

• Chlorination — yes, the municipal standard for a century.
• UV light — yes, with a sediment pre-filter. UV can’t disinfect what it can’t see through — cloudy water shields bacteria from the light. This is where filter ratings earn their keep: a 5-micron nominal sediment cartridge ahead of the UV unit keeps the water clear enough for the light to do its job.
• Boiling — yes. A full rolling boil for one minute kills bacteria and viruses. (Note the contrast with nitrates: boiling fixes bacteria and worsens nitrate. Know which problem you have.)
• Distillation — yes.

What doesn’t:

• Standard carbon filters — no. They improve taste and remove chemicals; they don’t disinfect. A carbon filter on bacteria-positive water is decoration.
• Standard water softeners — no.
• A sediment filter alone — no. It protects your UV or RO unit; it doesn’t make water safe by itself.

A word on micron ratings, since they matter here

Bacteria run about 0.2 to 10 microns. An absolute-rated sub-micron membrane can physically block them, but the nominal-rated sediment cartridges in most homes can’t be trusted for that — “nominal” means “most of the time,” and disinfection isn’t a most-of-the-time job. For bacteria, disinfect — don’t just filter.

Bottom line

Test for coliform annually (New Jersey requires it for private wells for good reason). A positive test is a to-do list, not a tragedy: confirm it, inspect, shock, and fix the source. And put disinfection — not just filtration — between your well and your glass.

Wondering what else might be in your water? Start with What’s In Your Water?

Nitrate is the most common chemical contaminant in America’s private wells. Not lead, not PFAS — nitrate. If your water comes from a well anywhere near farmland, a septic system, or livestock, this one is worth understanding.

What it is

Nitrate (NO₃) and nitrite (NO₂) are nitrogen compounds that dissolve easily in water. The EPA’s legal limit is 10 milligrams per liter measured as nitrogen — you’ll see it written “10 mg/L as N.” That number exists for one clear reason, which I’ll get to below.

Where it comes from

Mostly from the surface, working its way down. Synthetic fertilizers and manure spread on fields, septic system drain fields, feedlots, wastewater — rain and irrigation carry the nitrogen down into groundwater. Shallow wells in agricultural areas are the most exposed. This is also why New Jersey’s private-well testing law requires a nitrate test: the state knows it’s the likeliest thing to show up.

The honest health picture

The established, no-argument risk is to infants under six months: “blue baby syndrome” (methemoglobinemia). An infant’s digestive system converts nitrate to nitrite more readily, and nitrite interferes with the blood’s ability to carry oxygen. It is serious, and it is preventable — do not mix infant formula with water over the limit.

For adults, the picture is murkier. You’ll see alarming claims online; here’s the measured version. IARC (the International Agency for Research on Cancer) classifies ingested nitrate and nitrite under conditions that lead to nitrosamine formation in the body as Group 2A — “probably carcinogenic.” A quick framing note, since this series covers classified substances: IARC groups are hazard classifications. They say whether something can cause cancer, not how much risk a given exposure carries. Group 2A does not mean “dangerous at any dose.” The science on adult risk at typical exposures is still debated. What isn’t debated: infants and pregnant women should take the limit seriously.

How to test

A lab test for “nitrate as nitrogen,” usually $20–40 from a certified lab. Test once a year if you’re near farms or septic systems, and retest after heavy flooding — runoff spikes levels. If you’ve never tested your well for nitrate, that test is overdue.

What actually removes it

• Reverse osmosis — yes, effective.
• Anion exchange (nitrate-selective resin) — yes, the whole-house option.
• Distillation — yes.

What doesn’t — and the dangerous myth

• Boiling does NOT remove nitrate. It makes it worse. Water evaporates, nitrate stays, concentration goes up. This is the single most important sentence in this article: if your water is high in nitrate, boiling it for your baby’s formula concentrates the very thing you’re worried about.
• Standard carbon filters — no.
• Standard water softeners — no (they swap calcium for sodium; nitrate sails through).
• UV light — no. UV kills bacteria; it doesn’t touch dissolved chemicals.

Bottom line

Nitrate is common, testable, and fixable — but only by the right equipment. If you’re on a well, test for it. If it’s over 10 mg/L as N, an RO unit at the kitchen sink handles drinking and cooking water, and that’s the honest, proportionate fix.

Wondering what else might be in your water? Start with What’s In Your Water?

Arsenic is the quietest contaminant in this series. It has no taste, no smell, and no color — your senses give you zero warning. The only way to know it’s in your water is a lab test. That’s the first thing to understand, because everything else follows from it.

This isn’t a factory-spill story. Most arsenic in drinking water is natural — it dissolves out of bedrock into groundwater. If you’re on a private well, that’s the pathway. The hotspots in the U.S. are bedrock wells in New England, the Southwest, the Great Lakes region, and the upper Midwest — and yes, New Jersey has its own piece of this: arsenic is the second most common contaminant to exceed drinking-water standards in NJ private wells, with the Piedmont region carrying the highest risk. (Some arsenic does come from people — old arsenical pesticides, mining and smelting waste — but geology is the main source.)

The health picture, honestly

Arsenic is an IARC Group 1 carcinogen. As the series rule goes: Group 1 is a hazard classification — it means arsenic can cause cancer, not that any dose will. The cancer evidence comes from people who drank high-arsenic water for years, mostly in studies from Taiwan, Chile, and Bangladesh.

Here’s what long-term exposure to elevated inorganic arsenic actually does. The most characteristic effect is a pattern of skin changes: patches of darkened or lightened skin, and thickening — small “corns” or warts — on the palms, soles, and torso. These can show up after years of exposure and can precede non-melanoma skin cancer. The cancer picture from the research: increased risk of skin, lung, and bladder cancer, with liver, kidney, and prostate cancers also implicated. Studies also link chronic exposure to cardiovascular disease, nerve damage (a “pins and needles” numbness in hands and feet), and type 2 diabetes.

The honest framing: this is about years of drinking water over the limit, not a glass from the tap. EPA’s federal limit is 10 parts per billion (micrograms per liter) — and its health goal is zero, meaning there’s no level considered risk-free. New Jersey doesn’t wait for Washington here: our state standard is 5 ppb, half the federal limit, and it’s held that number since 2006. If your water is at or under 5, you’re in good shape.

How to test

No dip strip, no home kit for real answers — arsenic needs a certified lab. If you’re on city water, your utility tests it and reports it on your annual water-quality report. If you’re on a private well, that test is on you: use a state-certified drinking-water lab. Test before you treat, test again after you install anything, and retest yearly. Arsenic levels in a well can shift, and filters wear out.

One more NJ note: if you’ve bought or sold a house here, arsenic is part of the Private Well Testing Act — it gets tested at real estate transactions. Check the paperwork.

What actually removes it

Several proven methods — but with one catch that matters, so read this section twice. Arsenic comes in two forms: As(III) and As(V). Some treatment only handles one of them.

• Reverse osmosis. The workhorse. An under-sink RO handles both arsenic forms, and EPA’s own testing program found RO knocking out roughly 99% of total arsenic. This is the default recommendation for drinking and cooking water.
• Anion exchange. Effective — but only against As(V). If your well water has a big share of As(III), the water needs an oxidation pre-treatment step to convert it to As(V) first. This is why you need a full lab analysis before buying a system, not just a number.
• Adsorptive media (activated alumina and iron-based). Solid whole-house options — iron-oxide media in particular can handle As(III) too, which makes it a good fit for some well chemistries.
• Distillation. Works — boils the water, leaves the arsenic behind. Slow and energy-hungry for whole-house use, but legitimate.

Whatever you choose, look for NSF/ANSI certification with arsenic listed on it. Uncertified claims are just marketing.

What does NOT remove it:

• Carbon filters — your pitcher, faucet, or fridge filter. Carbon-based pitcher filters do not remove arsenic, period. (A rare few pitchers are NSF-certified for arsenic — unless the box says exactly that, assume it isn’t.)
• A water softener. It swaps hardness minerals; arsenic sails through.
• Boiling. Makes it worse — water evaporates, arsenic stays, concentration goes up.
• UV, chlorine, and sediment/particle filters. They disinfect or clarify; arsenic is neither.

One thing you can relax about: arsenic is barely absorbed through skin. Showering, bathing, washing clothes — fine. Protect the water you drink and cook with, and you’ve handled the exposure.

What I’d buy

Treatment type: an under-sink reverse osmosis system, NSF/ANSI 58 certified, with arsenic on the certification sheet — it handles both arsenic forms, no pre-treatment chemistry to fuss over, and it knocks out plenty of other things in the same pass. For a well with mostly As(III) and a whole-house approach, an iron-oxide adsorptive media system, sized to your water test, is the other legitimate play. Either way: test first, install second, retest after.

The bottom line

Arsenic is the argument for testing your well even when everything seems fine — because with this one, fine is exactly what dangerous looks like. New Jersey’s 5 ppb bar is stricter than the federal one, so check your number against that. If you’re over, the fix is real and proven: RO for the kitchen, adsorptive media for the whole house, nothing else sold as a shortcut.

Start here: What’s In Your Water? — learn how to read your water report and test your own tap.