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.
Chlorite by state
Every state where a public water system reports Chlorite in its annual report, ranked by systems at or above the federal limit.
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.
+Which states report the most Chlorite in their drinking water?
Of the systems on The Water Map, Texas (1 system at or above the limit), Louisiana (1 system at or above the limit), South Carolina (1 system at or above the limit) report the most Chlorite exceedances. The state-by-state table on this page lists every state.
+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.