Disinfection byproducts
Chlorite in U.S. tap water
91 public water systems across 15 U.S. states report Chlorite in their annual Consumer Confidence Report. 3 sit at or above the federal limit.
At or above the federal limit (3)
| Water system | Measured | vs. limit |
|---|---|---|
| Shreveport, LA 2024 annual report | 0–1.7 mg/L | 1.7× the limit |
| Columbia, SC 2024 annual report | 1.32 mg/L | 1.3× the limit |
| Frisco, TX 2024 annual report | 1 mg/L | 1.0× the limit |
Approaching the limit (7)
| Water system | Measured | vs. limit |
|---|---|---|
| Montgomery, AL 2024 annual report | 0.97 mg/L | 1.0× the limit |
| Abilene, TX 2024 annual report | 0.92 mg/L | 0.9× the limit |
| Avila Beach Community Services District — Avila Beach, Ca, CA 2023 annual report | 0.2–0.89 mg/L | 0.9× the limit |
| Pismo Beach Water Department — Pismo Beach, Ca, CA 2023 annual report | 0.2–0.89 mg/L | 0.9× the limit |
| Oceano Comm Services Dist. — Oceano, Ca, CA 2021 annual report | 0.28–0.86 mg/L | 0.9× the limit |
| Brownsville, TX 2024 annual report | 0.81 mg/L | 0.8× the limit |
| Yuma, AZ 2025 annual report | 0–0.8 mg/L | 0.8× the limit |
Within the federal limit (81)
| Water system | Measured |
|---|---|
| Mobile, AL 2024 annual report | 0.78 mg/L |
| City of Arroyo Grande Utilities Division — Arroyo Grande, Ca, CA 2022 annual report | 0.71 mg/L |
| Phoenix, AZ 2025 annual report | 0–0.7 mg/L |
| Lopez Project — San Luis Obispo, Ca, CA 2023 annual report | 0.68 mg/L |
| Grand Prairie, TX 2024 annual report | 0.679 mg/L |
| Akron, OH 2024 annual report | 0.15–0.64 mg/L |
| Santa Fe I.d. — Rancho Santa Fe, Ca, CA 2023 annual report | 0.39–0.6 mg/L |
| Corpus Christi, TX 2024 annual report | 0.59 mg/L |
| Rincon Del Diablo MWD (id-a) — Escondido, Ca, CA 2023 annual report | 0.28–0.59 mg/L |
| Vista Irrigation District — Vista, Ca, CA 2023 annual report | 0.34–0.59 mg/L |
| City of Grover Beach Public Works Dept — Grover Beach, Ca, CA 2023 annual report | 0.57 mg/L |
| Macon, GA 2023 annual report | 0.51 mg/L |
| Mcallen, TX 2024 annual report | 0.503 mg/L |
| Glendale, AZ 2024 annual report | 0.48 mg/L |
| San Dieguito Wd — Encinitas, Ca, CA 2023 annual report | 0.48 mg/L |
| Aurora, CO 2024 annual report | 0.47 mg/L |
| Centennial, CO 2023 annual report | 0.47 mg/L |
| Escondido, CA 2024 annual report | 0.47 mg/L |
| Lowell, MA 2025 annual report | 0.43 mg/L |
| Chula Vista Sweetwater, CA 2024 annual report | 0.02–0.426 mg/L |
| Sweetwater Authority — Chula Vista, Ca, CA 2023 annual report | 0.02–0.426 mg/L |
| San Diego, CA 2023 annual report | 0.42 mg/L |
| Lynn, MA 2024 annual report | 0.4 mg/L |
| Lakewood, NJ 2025 annual report | 0.39 mg/L |
| Salt Lake City, UT 2024 annual report | 0.38 mg/L |
| Mesa, AZ 2024 annual report | 0.36 mg/L |
| West Jordan, UT 2024 annual report | 0.36 mg/L |
| West Valley City, UT 2024 annual report | 0.36 mg/L |
| Sugar Land, TX 2024 annual report | 0.34 mg/L |
| Lubbock, TX 2024 annual report | 0.325 mg/L |
| El Paso, TX 2024 annual report | 0–0.317 mg/L |
| Columbus, GA 2024 annual report | 0.07–0.28 mg/L |
| Louisville, KY 2024 annual report | 0.23 mg/L |
| City of Antioch, CA 2024 annual report | 0.2 mg/L |
| City of Brentwood, CA 2024 annual report | 0.2 mg/L |
| City of Martinez, CA 2024 annual report | 0.2 mg/L |
| City of Pittsburg, CA 2024 annual report | 0.2 mg/L |
| Concord, CA 2024 annual report | 0.2 mg/L |
| Diablo Water District, CA 2024 annual report | 0.2 mg/L |
| Golden State Water Company, CA 2024 annual report | 0.2 mg/L |
| Garland, TX 2024 annual report | 0.187 mg/L |
| Mckinney, TX 2024 annual report | 0.187 mg/L |
| Mesquite, TX 2024 annual report | 0.187 mg/L |
| Plano, TX 2024 annual report | 0.187 mg/L |
| Richardson, TX 2024 annual report | 0.16 mg/L |
| City of San Clemente — San Clemente, Ca, CA 2022 annual report | 0.1 mg/L |
| El Toro Water District — Lake Forest, Ca, CA 2022 annual report | 0.1 mg/L |
| Joint Regional Water Supply System — Laguna Beach, Ca, CA 2022 annual report | 0.1 mg/L |
| Smwd - Sj Ground Water Plant — Rancho Santa Margarita, Ca, CA 2022 annual report | 0.1 mg/L |
| South Coast Water District — Laguna Beach, Ca, CA 2022 annual report | 0.1 mg/L |
Showing 50 of 81. The full list is in the JSON API.
Frequently asked
+What is Chlorite?
Chlorite is a contaminant some U.S. public water utilities measure and report in their annual Consumer Confidence Report.
+What is the federal limit for Chlorite in drinking water?
The federal MCLG for Chlorite is 0.8 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 Chlorite over the federal limit?
3 of the 91 public water systems on The Water Map report Chlorite at or above its federal limit, spanning 15 U.S. states. The full list is on this page.
+How can I check if Chlorite 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 Chlorite.