Disinfection byproducts
Bromate in U.S. tap water
286 public water systems across 21 U.S. states report Bromate in their annual Consumer Confidence Report. 23 sit at or above the federal limit.
What it is
A disinfection byproduct formed when bromide-containing water is treated with ozone.
Why it's regulated
Classified as a probable human carcinogen; the EPA sets a strict maximum contaminant level.
At or above the federal limit (23)
| Water system | Measured | vs. limit |
|---|---|---|
| El Segundo-city, Water Dept. — El Segundo, Ca, CA 2021 annual report | 0–55 ug/L | 5.5× the limit |
| El Segundo-city, Water Dept. — El Segundo, Ca, CA 2022 annual report | 0–20 ug/L | 2.0× the limit |
| Elsinore Valley MWD — Lake Elsinore, Ca, CA 2022 annual report | 0–20 ug/L | 2.0× the limit |
| Home Gardens County Wd — Corona, Ca, CA 2022 annual report | 0–20 ug/L | 2.0× the limit |
| City of Hemet, CA 2024 annual report | 0–19 ug/L | 1.9× the limit |
| City of Menifee, CA 2024 annual report | 0–19 ug/L | 1.9× the limit |
| City of Murrieta, CA 2024 annual report | 0–19 ug/L | 1.9× the limit |
| City of San Jacinto, CA 2024 annual report | 0–19 ug/L | 1.9× the limit |
| East Valley Service Area, CA 2024 annual report | 0–19 ug/L | 1.9× the limit |
| Mills Service Area, CA 2024 annual report | 0–19 ug/L | 1.9× the limit |
| Moreno Valley, CA 2024 annual report | 0–19 ug/L | 1.9× the limit |
| Overland Park, KS 2023 annual report | 0–17 ug/L | 1.7× the limit |
| Goodyear, AZ 2024 annual report | 0.016 mg/L | 1.6× the limit |
| Beverly Hills-city, Water Dept. — Beverly Hills, Ca, CA 2021 annual report | 0–15 ug/L | 1.5× the limit |
| Beverly Hills-city, Water Dept. — Beverly Hills, Ca, CA 2022 annual report | 0–14 ug/L | 1.4× the limit |
| Chandler, AZ 2024 annual report | 1.1–14 ug/L | 1.4× the limit |
| Waco, TX 2024 annual report | 0–13.4 ug/L | 1.3× the limit |
| Columbus, OH 2025 annual report | 0–13 ug/L | 1.3× the limit |
| Crescenta Valley Cwd — La Crescenta, Ca, CA 2022 annual report | 0–12 ug/L | 1.2× the limit |
| Glendora-city, Water Dept. — Glendora, Ca, CA 2022 annual report | 0–12 ug/L | 1.2× the limit |
| Rowland Water District — Rowland Heights, Ca, CA 2022 annual report | 0–12 ug/L | 1.2× the limit |
| Valencia Heights Water Co. — West Covina, Ca, CA 2022 annual report | 0–12 ug/L | 1.2× the limit |
| Frisco, TX 2024 annual report | 10 ug/L | 1.0× the limit |
Approaching the limit (19)
| Water system | Measured | vs. limit |
|---|---|---|
| Beverly Hills-city, Water Dept. — Beverly Hills, Ca, CA 2020 annual report | 1.2–9.8 ug/L | 1.0× the limit |
| Orlando, FL 2024 annual report | 0–9.8 ug/L | 1.0× the limit |
| Beverly Hills-city, Water Dept. — Beverly Hills, Ca, CA 2023 annual report | 0–9.2 ug/L | 0.9× the limit |
| City of Alhambra — Alhambra, Ca, CA 2023 annual report | 0–9.2 ug/L | 0.9× the limit |
| Glendora-city, Water Dept. — Glendora, Ca, CA 2023 annual report | 0–9.2 ug/L | 0.9× the limit |
| Mckinney, TX 2024 annual report | 9.19 ug/L | 0.9× the limit |
| Plano, TX 2024 annual report | 9.19–9.19 ug/L | 0.9× the limit |
| Fargo, ND 2024 annual report | 0–9.1 ug/L | 0.9× the limit |
| Edison, NJ 2024 annual report | 9 ug/L | 0.9× the limit |
| Green Bay, WI 2024 annual report | 0–8.8 ug/L | 0.9× the limit |
| Ann Arbor, MI 2024 annual report | 0–8.6 ug/L | 0.9× the limit |
| Carlsbad MWD — Carlsbad, Ca, CA 2023 annual report | 0–8.5 ug/L | 0.9× the limit |
| Chula Vista Otay, CA 2024 annual report | 0–8.5 ug/L | 0.9× the limit |
| Otay Water District — Spring Valley, Ca, CA 2023 annual report | 0–8.5 ug/L | 0.9× the limit |
| Padre Dam MWD — Santee, Ca, CA 2023 annual report | 0–8.5 ug/L | 0.9× the limit |
| Ramona Municipal Wd — Ramona, Ca, CA 2023 annual report | 0–8.5 ug/L | 0.9× the limit |
| Vallecitos Wd — San Marcos, Ca, CA 2023 annual report | 0–8.5 ug/L | 0.9× the limit |
| Vista Irrigation District — Vista, Ca, CA 2023 annual report | 0–8.5 ug/L | 0.9× the limit |
| Tampa, FL 2024 annual report | 0.905–8.16 ug/L | 0.8× the limit |
Within the federal limit (236)
Showing 50 of 236. The full list is in the JSON API.
Frequently asked
+What is Bromate?
A disinfection byproduct formed when bromide-containing water is treated with ozone. Classified as a probable human carcinogen; the EPA sets a strict maximum contaminant level.
+What is the federal limit for Bromate in drinking water?
The federal MCLG for Bromate is 0 ug/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 Bromate over the federal limit?
23 of the 286 public water systems on The Water Map report Bromate at or above its federal limit, spanning 21 U.S. states. The full list is on this page.
+How can I check if Bromate 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 Bromate.