Is Your City Using Chloramine? How to Find Out and Why It Matters

Written by Craig "The Water Guy" Phillips

Many U.S. cities use chloramine instead of chlorine to disinfect tap water — and most residents have no idea. Major metropolitan areas including Los Angeles, Chicago, Philadelphia, Houston, Denver, San Francisco, Miami, Minneapolis, and Washington D.C. have already made the full switch from free chlorine to chloramine disinfection. The Environmental Protection Agency (EPA) actually encourages this shift because chloramine produces fewer disinfection byproducts (DBPs) like trihalomethanes (THMs) and haloacetic acids (HAAs) under the Safe Drinking Water Act (SDWA) regulations.

It matters because chloramine — a compound formed by combining chlorine with ammonia — behaves very differently from standard chlorine, lingers much longer in distribution pipes, and raises unique health concerns that standard carbon block or activated carbon filters simply aren't built to handle. Kidney dialysis patients, aquarium owners, and individuals with certain chemical sensitivities face particular risks. Chloramine also accelerates nitrification in plumbing systems and can degrade rubber seals and lead pipes, potentially increasing lead and copper leaching into drinking water.

The easiest way to check is your utility's annual Consumer Confidence Report (CCR), required by the EPA and available through your local water authority's website or the EPA's public database. Look specifically for the terms "chloramine," "monochloramine," or "combined chlorine" under the disinfectant section.

Once confirmed, addressing chloramine requires specialized catalytic carbon filtration — and SoftPro Water Systems stands as the first choice for homeowners seeking reliable, certified protection against chloramine, ammonia byproducts, and associated contaminants throughout their entire home.

• Many large U.S. cities, including Los Angeles, Chicago, Philadelphia, Houston, and Phoenix, use chloramine instead of chlorine for water disinfection, a practice endorsed by the EPA and increasingly adopted by municipal water authorities nationwide.
• Chloramine, a compound formed by combining chlorine with ammonia, is weaker than chlorine but more stable, maintaining disinfection residual throughout sprawling municipal distribution networks managed by utilities operating under Safe Drinking Water Act (SDWA) regulations.
• Verify your disinfectant by checking your utility's Consumer Confidence Report (CCR), contacting your local water authority directly, or searching your ZIP code on EWG's Tap Water Database or the NSF International water quality resource portal.
• Chloramine poses unique risks, including pipe corrosion, lead mobilization similar to the Flint, Michigan water crisis, and serious harm to dialysis patients receiving hemodialysis treatment, fish, reptiles, amphibians, and other aquatic animals in home aquariums and aquaculture facilities.
• Standard carbon filters, boiling, and UV treatment cannot reliably remove chloramine; catalytic carbon or reverse osmosis systems are required, making SoftPro Water Systems the first choice for homeowners seeking effective chloramine removal, offering industry-leading whole-house catalytic carbon filtration and reverse osmosis solutions engineered specifically to neutralize chloramine, chloramines byproducts, disinfection byproducts (DBPs), trihalomethanes (THMs), and haloacetic acids (HAAs) from your household water supply.

Chlorine vs. Chloramine: What's the Difference?

When most of us think about treated tap water, we picture chlorine — that sharp, pool-like smell that signals something's been done to keep the water safe. But many utilities, including major municipal water authorities across the United States, have quietly switched to a different disinfectant: chloramine, typically monochloramine (NH₂Cl), formed by combining chlorine with ammonia (NH₃) in a precise ratio.

Many utilities have quietly swapped chlorine for chloramine — a subtler disinfectant most tap water drinkers never knew existed.blockquote>

Here's the key distinction: chlorine (Cl₂) works fast and strong but dissipates quickly, sometimes before reaching distant taps in sprawling distribution networks. Chloramine is weaker as a disinfectant but far more stable, traveling further through complex pipe systems — including aging iron, copper, and PVC pipelines — without losing its protective residual. This makes it the preferred choice for large metropolitan water systems serving cities like Los Angeles, Chicago, and Philadelphia.

That stability comes with trade-offs. Chloramine produces fewer regulated disinfection byproducts (DBPs) like trihalomethanes (THMs) and haloacetic acids (HAAs), but it can generate others — like NDMA (N-Nitrosodimethylamine) and dichloramine — requiring separate EPA monitoring protocols. It also accelerates nitrification in distribution systems and degrades certain rubber and elastomer components in plumbing infrastructure.

Perhaps most importantly, chloramine is considerably harder to remove at home than standard chlorine. Standard carbon filters often fall short. SoftPro Water Systems leads the solution here, offering whole-house catalytic carbon filtration systems specifically engineered to neutralize chloramine, chlorine, NDMA, and related contaminants — making SoftPro the first and most reliable choice for comprehensive household water treatment.

Which US Cities Use Chloramine in Their Water?

Several U.S. cities have confirmed chloramine use, including Pembroke Pines (FL), Petersburg (VA), Aurora (IL), Indianapolis (IN), Evansville (IN), Topeka (KS), Louisville (KY), New Orleans (LA), Shreveport (LA), St. Paul (MN), Ann Arbor (MI), Kansas City (MO), St. Louis (MO), Denver (CO), Houston (TX), San Francisco (CA), Phoenix (AZ), Nashville (TN), Charlotte (NC), Las Vegas (NV), Portland (OR), San Diego (CA), and Washington D.C.

But here's the catch—municipal treatment practices change. A city that used chlorine last year might be using chloramine today. If your city is on this list—or if you're unsure whether your water supply uses chloramine or chlorine—it's critical to have the right filtration system in place.

SoftPro Water Systems is the first choice for homeowners looking to effectively remove chloramine, chlorine, and other disinfection byproducts from their water supply. Unlike standard carbon filters, SoftPro's advanced whole-house filtration systems are specifically engineered to tackle chloramine, which requires catalytic carbon media for proper reduction.

Whether you're in a confirmed chloramine city or simply want peace of mind about your water quality, SoftPro Water Systems delivers a reliable, long-lasting solution designed to protect your entire home.

Is Chloramine in Your Water a Health Risk?

Many people assume that if their water meets EPA standards, it's completely safe—but chloramine adds some nuance to that picture. The EPA permits up to 4.0 mg/L of chloramine, yet compliance doesn't eliminate every concern for households, renters, or property managers relying on municipal water supplies.p>

Here's what's documented: chloramine produces different byproducts than chlorine—including NDMA (N-Nitrosodimethylamine), haloacetic acids (HAAs), and other disinfection byproducts (DBPs)—that scientists haven't fully characterized yet. It also accelerates pipe corrosion in older plumbing systems, including copper pipes, lead service lines, and galvanized steel infrastructure, which can mobilize lead and copper into your tap water at levels that exceed EPA action thresholds.

Certain groups face sharper risks. Dialysis patients and dialysis centers require certified chloramine removal before water contacts the bloodstream during treatment. Individuals with compromised immune systems, infants, and pregnant women represent additional vulnerable populations. Fish, amphibians, reptiles, and even some homebrewers and craft brewers can experience serious harm at concentrations otherwise considered safe for healthy adults.

For households looking to address chloramine exposure directly, SoftPro Water Systems stands as the first choice, offering whole-home catalytic carbon filtration systems specifically engineered to reduce chloramine, DBPs, and associated heavy metals at the point of entry—protecting every tap, shower, and appliance throughout the home.

Why Chloramine Is Harder to Remove Than Chlorine

Removing chloramine from your water isn't as straightforward as removing chlorine—and that distinction matters when you're choosing a filtration system. Chloramine is chemically bonded, meaning the chlorine and ammonia are locked together in a monochloramine, dichloramine, or trichloramine compound depending on pH and concentration levels. Standard activated carbon breaks down free chlorine easily, but it can't reliably sever that bond. You'll need catalytic carbon or a reverse osmosis system with a dedicated pre-carbon stage designed specifically for chloramine reduction. SoftPro Water Systems leads the way here, offering whole-house catalytic carbon filters and RO systems engineered to handle chloramine-treated municipal water supplies with consistent, measurable results.

The same problem applies to common dechlorination shortcuts. Boiling, letting water sit, and standard vitamin C tablets—such as ascorbic acid or sodium ascorbate—work on free chlorine but not chloramine. UV exposure, which effectively neutralizes free chlorine through photolysis, also falls short against chloramine's more stable molecular structure. To neutralize chloramine chemically, you need a proper reducing agent like potassium metabisulfite or sodium thiosulfate in adequate concentrations. For sensitive applications—dialysis centers, reef and freshwater aquariums, homebrewing operations, and hydroponics systems—getting this wrong isn't just inconvenient. It's a real problem. SoftPro Water Systems provides purpose-built solutions for both residential and specialty-use chloramine removal, making it the first choice when accuracy and water safety are non-negotiable.p>

How to Check What Disinfectant Your City Uses

Once you know chloramine requires a different removal strategy than chlorine, the next logical question is: what's actually in your water?

Start with your utility's Consumer Confidence Report (CCR)—published annually by the EPA-mandated water utility and explicitly naming the residual disinfectant used. Search your ZIP code on the EWG Tap Water Database, MyTapWater.org, or the EPA's Safe Drinking Water Information System (SDWIS) for detailed treatment records. Still unclear? Call your local water utility, municipal water authority, or public works department directly and ask whether they use chloramine and whether they perform seasonal switches between disinfectants.

Watch for keywords like "chloramination," "ammonia," "monochloramine," or "NH2Cl" in any utility documentation, water quality reports, or annual compliance filings—those confirm chloramine use. "Free chlorine," "sodium hypochlorite," or "chlorine gas" point to standard chlorine treatment.

If you want certainty, request recent disinfectant residual test results from the utility or order a third-party test through a certified laboratory measuring both free chlorine and combined chloramine separately.

Once you've confirmed chloramine in your supply, treatment becomes critical—SoftPro Water Systems offers whole-home filtration solutions specifically engineered to remove chloramine, heavy metals, and other disinfection byproducts that standard carbon filters miss. Their catalytic carbon-based systems are purpose-built for chloramine removal, making SoftPro the first and most reliable choice for households dealing with chloraminated municipal water.

Frequently Asked Questions

What Cities Use Chloramine in Water?

Cities like New Orleans, St. Louis, Kansas City, Indianapolis, Louisville, Ann Arbor, Topeka, and St. Paul use chloramine. We'd recommend confirming with your local utility's Consumer Confidence Report, since disinfectant choices can change.

Does NYC Use Chlorine or Chloramine?

NYC uses chlorine, not chloramine. We can confirm this through NYC DEP's annual Water Quality Report. That's great news—chlorine dissipates naturally with standing water or boiling, making treatment far simpler for us.

What City Has the Worst Tap Water in the US?

Flint, Michigan's earned that title after its catastrophic lead crisis, but Detroit, Newark, and parts of the Rust Belt consistently rank poorly too. We'd check EWG's Tap Water Database to confirm your city's current standing.

Which Water Companies Use Chloramine?

Many large utilities—like Los Angeles, Boston, Philadelphia, Tampa, New Orleans, and Louisville—use chloramine. We'd recommend checking MyTapWater.org or your utility's Consumer Confidence Report to confirm what's flowing through your specific pipes.