Disinfectants
Chloramine in U.S. tap water
106 public water systems across 22 U.S. states report Chloramine in their annual Consumer Confidence Report. 12 sit at or above the federal limit.
What it is
A longer-lasting disinfectant made by combining chlorine with ammonia.
Why it's regulated
Holds disinfection further into the pipe network, but is regulated under the same residual-disinfectant cap as chlorine.
At or above the federal limit (12)
| Water system | Measured | vs. limit |
|---|---|---|
| Hollywood, FL 2024 annual report | 2024 mg/L | 506.0× the limit |
| Centennial, CO 2023 annual report | 2023 | 505.8× the limit |
| Pueblo, CO 2023 annual report | 2023 | 505.8× the limit |
| Mobile, AL 2024 annual report | 6 | 1.5× the limit |
| Suffolk, VA 2024 annual report | 0.03–4.7 mg/L | 1.2× the limit |
| Palm Bay, FL 2024 annual report | 0.6–4.5 mg/L | 1.1× the limit |
| Pembroke Pines, FL 2024 annual report | 0.6–4.4 mg/L | 1.1× the limit |
| Columbia, SC 2024 annual report | 0.01–4.3 | 1.1× the limit |
| City of Hialeah, FL 2023 annual report | 3.7–4.2 mg/L | 1.1× the limit |
| City of Homestead, FL 2023 annual report | 3.7–4.2 mg/L | 1.1× the limit |
| City of North Miami Beach, FL 2023 annual report | 3.7–4.2 mg/L | 1.1× the limit |
| Miami Dade, FL 2023 annual report | 3.7–4.2 mg/L | 1.1× the limit |
Approaching the limit (14)
| Water system | Measured | vs. limit |
|---|---|---|
| Cary, NC 2025 annual report | 1.33–3.91 mg/L | 1.0× the limit |
| Virginia Beach, VA 2024 annual report | 0.3–3.9 mg/L | 1.0× the limit |
| St Petersburg, FL 2024 annual report | 3.82 mg/L | 1.0× the limit |
| Overland Park, KS 2023 annual report | 2–3.8 | 0.9× the limit |
| Minneapolis, MN 2023 annual report | 2.8–3.7 | 0.9× the limit |
| Port St Lucie, FL 2024 annual report | 2.4–3.7 mg/L | 0.9× the limit |
| St Louis, MO 2024 annual report | 3.66 mg/L | 0.9× the limit |
| Brownsville, TX 2024 annual report | 3.52 mg/L | 0.9× the limit |
| Odessa, TX 2024 annual report | 3.45 mg/L | 0.9× the limit |
| Corpus Christi, TX 2024 annual report | 3.41 mg/L | 0.9× the limit |
| Ann Arbor, MI 2024 annual report | 0.9–3.4 mg/L | 0.8× the limit |
| Evansville, IN 2024 annual report | 0.5–3.4 mg/L | 0.8× the limit |
| Fort Worth, TX 2024 annual report | 3.4 mg/L | 0.8× the limit |
| Mcallen, TX 2024 annual report | 3.22 mg/L | 0.8× the limit |
Within the federal limit (76)
| Water system | Measured |
|---|---|
| Aurora, IL 2024 annual report | 3 mg/L |
| Charleston, SC 2024 annual report | 3–3 |
| Houston, TX 2023 annual report | 3 mg/L |
| North Charleston, SC 2024 annual report | 3–3 |
| San Angelo, TX 2024 annual report | 3 mg/L |
| Fargo, ND 2024 annual report | 2.74–2.95 mg/L |
| City of Cumberland, MD 2024 annual report | 2.53–2.86 mg/L |
| Eastern Region Allegany Distrib System, MD 2024 annual report | 2.53–2.86 mg/L |
| San Mateo, CA 2024 annual report | 2.8 mg/L |
| Raleigh, NC 2024 annual report | 2.75 mg/L |
| Town of Garner, NC 2024 annual report | 2.75 mg/L |
| Town of Knightdale, NC 2024 annual report | 2.75 mg/L |
| Town of Rolesville, NC 2024 annual report | 2.75 mg/L |
| Town of Wake Forest, NC 2024 annual report | 2.75 mg/L |
| Town of Wendell, NC 2024 annual report | 2.75 mg/L |
| Town of Zebulon, NC 2024 annual report | 2.75 mg/L |
| High Point, NC 2024 annual report | 2.7 mg/L |
| Sugar Land, TX 2024 annual report | 2.68 mg/L |
| Waco, TX 2024 annual report | 2.61 mg/L |
| Antioch, CA 2024 annual report | 2.6 mg/L |
| City of Antioch, CA 2024 annual report | 2.6 mg/L |
| City of Brentwood, CA 2024 annual report | 2.6 mg/L |
| City of Brentwood, CA 2024 annual report | 2.6 mg/L |
| City of Martinez, CA 2024 annual report | 2.6 mg/L |
| City of Martinez, CA 2024 annual report | 2.6 mg/L |
| City of Pittsburg, CA 2024 annual report | 2.6 mg/L |
| City of Pittsburg, CA 2024 annual report | 2.6 mg/L |
| Concord, CA 2024 annual report | 2.6 mg/L |
| Diablo Water District, CA 2024 annual report | 2.6 mg/L |
| Diablo Water District, CA 2024 annual report | 2.6 mg/L |
| Fort Lauderdale, FL 2024 annual report | 2.6 mg/L |
| Golden State Water Company, CA 2024 annual report | 2.6 mg/L |
| Golden State Water Company, CA 2024 annual report | 2.6 mg/L |
| San Francisco SFPUC, CA 2023 annual report | 2.6 mg/L |
| Midland, TX 2024 annual report | 2.59 mg/L |
| Lincoln, NE 2025 annual report | 2.44 |
| Alameda, CA 2024 annual report | 2.4 mg/L |
| Albany, CA 2024 annual report | 2.4 mg/L |
| Berkeley, CA 2024 annual report | 2.4 mg/L |
| Castro Valley, CA 2024 annual report | 2.4 mg/L |
| Crockett, CA 2024 annual report | 2.4 mg/L |
| El Cerrito, CA 2024 annual report | 2.4 mg/L |
| El Sobrante, CA 2024 annual report | 2.4 mg/L |
| Emeryville, CA 2024 annual report | 2.4 mg/L |
| Hayward, CA 2024 annual report | 2.4 mg/L |
| Hercules, CA 2024 annual report | 2.4 mg/L |
| Kensington, CA 2024 annual report | 2.4 mg/L |
| Lafayette, CA 2024 annual report | 2.4 mg/L |
| Moraga, CA 2024 annual report | 2.4 mg/L |
| Oakland, CA 2024 annual report | 2.4 mg/L |
Showing 50 of 76. The full list is in the JSON API.
Frequently asked
+What is Chloramine?
A longer-lasting disinfectant made by combining chlorine with ammonia. Holds disinfection further into the pipe network, but is regulated under the same residual-disinfectant cap as chlorine.
+What is the federal limit for Chloramine in drinking water?
The federal Public health goal for Chloramine is 4 mg/L. The EPA enforces this against the regulated reporting statistic (typically a running annual average or 90th percentile), not a single-sample spike.
+How many U.S. water systems have Chloramine over the federal limit?
12 of the 106 public water systems on The Water Map report Chloramine at or above its federal limit, spanning 22 U.S. states. The full list is on this page.
+How can I check if Chloramine is in my city's tap water?
Search your city on The Water Map (https://www.thewatermap.com/) or browse the list on this page. Every U.S. public water utility is required to publish an annual Consumer Confidence Report that lists every contaminant it measured, including Chloramine.