Disinfectants
Chloramine in U.S. tap water
135 public water systems across 22 U.S. states report Chloramine in their annual Consumer Confidence Report. 16 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 (16)
| Water system | Measured | vs. limit |
|---|---|---|
| Hialeah, FL 2023 annual report | 0–5.9 mg/L | 1.5× the limit |
| Shreveport, LA 2024 annual report | 0.5–5.6 mg/L | 1.4× the limit |
| Tampa, FL 2024 annual report | 0.2–5.6 mg/L | 1.4× the limit |
| Richmond, VA 2024 annual report | 3–5.1 mg/L | 1.3× the limit |
| Suffolk, VA 2024 annual report | 0.03–4.7 mg/L | 1.2× the limit |
| Chula Vista Sweetwater, CA 2024 annual report | 0.2–4.66 mg/L | 1.2× the limit |
| Sweetwater Authority — Chula Vista, Ca, CA 2023 annual report | 0.2–4.66 mg/L | 1.2× the limit |
| Palm Bay, FL 2024 annual report | 0.6–4.5 mg/L | 1.1× the limit |
| Jackson, MS 2024 annual report | 0.31–4.4 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 mg/L | 1.1× the limit |
| City of Hialeah, FL 2023 annual report | 0.6–4.2 mg/L | 1.1× the limit |
| City of North Miami Beach, FL 2023 annual report | 0.6–4.2 mg/L | 1.1× the limit |
| Miami Dade, FL 2023 annual report | 0.6–4.2 mg/L | 1.1× the limit |
| Pearland, TX 2024 annual report | 0.5–4 mg/L | 1.0× the limit |
| Pueblo, CO 2023 annual report | 4 mg/L | 1.0× the limit |
Approaching the limit (21)
| Water system | Measured | vs. limit |
|---|---|---|
| Cary, NC 2025 annual report | 1.33–3.91 mg/L | 1.0× the limit |
| Abilene, TX 2024 annual report | 3.9 mg/L | 1.0× the limit |
| Virginia Beach, VA 2024 annual report | 0.3–3.9 mg/L | 1.0× the limit |
| San Dieguito Wd — Encinitas, Ca, CA 2023 annual report | 3.45–3.85 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 mg/L | 0.9× the limit |
| Minneapolis, MN 2023 annual report | 2.8–3.7 mg/L | 0.9× the limit |
| Port St Lucie, FL 2024 annual report | 2.4–3.7 mg/L | 0.9× the limit |
| Westborough Water District — South San Francisco, Ca, CA 2023 annual report | 3.69 mg/L | 0.9× the limit |
| St Louis, MO 2024 annual report | 3.66 mg/L | 0.9× the limit |
| Padre Dam MWD — Santee, Ca, CA 2023 annual report | 0.52–3.6 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 |
| Fort Worth, TX 2024 annual report | 3.4 mg/L | 0.8× the limit |
| Las Virgenes MWD — Calabasas, Ca, CA 2023 annual report | 0–3.34 mg/L | 0.8× the limit |
| Norfolk, VA 2023 annual report | 3.3 mg/L | 0.8× the limit |
| Topeka, KS 2024 annual report | 3.3 mg/L | 0.8× the limit |
| Mcallen, TX 2024 annual report | 3.22 mg/L | 0.8× the limit |
| Hollywood, FL 2024 annual report | 1–3.2 mg/L | 0.8× the limit |
Within the federal limit (98)
Showing 50 of 98. 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 MCL 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?
16 of the 135 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.