Disinfection byproducts
Bromate in U.S. tap water
132 public water systems across 21 U.S. states report Bromate in their annual Consumer Confidence Report. 37 sit at or above the federal limit.
132
systems measuring
37
over the limit
21
states represented
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.
Federal limit0.1 ug/L· Public health goal
At or above the federal limit (37)
| Water system | Measured | vs. limit |
|---|---|---|
| Columbus, OH 2025 annual report | 2025 ug/L | 202.5× the limit |
| City of Hemet, CA 2024 annual report | 0–19 ug/L | 190.0× the limit |
| City of Menifee, CA 2024 annual report | 0–19 ug/L | 190.0× the limit |
| City of Murrieta, CA 2024 annual report | 0–19 ug/L | 190.0× the limit |
| City of Perris, CA 2024 annual report | 0–19 ug/L | 190.0× the limit |
| City of San Jacinto, CA 2024 annual report | 0–19 ug/L | 190.0× the limit |
| City of Temecula, CA 2024 annual report | 0–19 ug/L | 190.0× the limit |
| East Valley Service Area, CA 2024 annual report | 0–19 ug/L | 190.0× the limit |
| Mills Service Area, CA 2024 annual report | 0–19 ug/L | 190.0× the limit |
| Moreno Valley, CA 2024 annual report | 0–19 ug/L | 190.0× the limit |
| Skinner Service Area, CA 2024 annual report | 0–19 ug/L | 190.0× the limit |
| Alameda, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Albany, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Berkeley, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Castro Valley, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Crockett, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| El Cerrito, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| El Sobrante, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Emeryville, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Hayward, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Hercules, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Kensington, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Lafayette, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Moraga, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Oakland, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Orinda, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Piedmont, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Pinole, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Richmond, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Rodeo, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| San Leandro, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| San Lorenzo, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| San Pablo, CA 2024 annual report | 0–1.7 ug/L | 17.0× the limit |
| Plano, TX 2024 annual report | 9.19 ug/L | 1.8× the limit |
| Overland Park, KS 2023 annual report | 0–17 | 1.7× the limit |
| Goodyear, AZ 2024 annual report | 0.016 mg/L | 1.6× the limit |
| Chandler, AZ 2024 annual report | 1.1–14 ug/L | 1.4× the limit |
Approaching the limit (5)
| Water system | Measured | vs. limit |
|---|---|---|
| Fargo, ND 2024 annual report | 0–9.1 ug/L | 0.9× the limit |
| Albuquerque, NM 2024 annual report | 0.9 | 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 |
| Chula Vista Otay, CA 2024 annual report | 0–8.5 ug/L | 0.8× the limit |
Within the federal limit (63)
| Water system | Measured |
|---|---|
| Elizabeth, NJ 2024 annual report | 7 ug/L |
| Mobile, AL 2024 annual report | 6 |
| Mesa, AZ 2024 annual report | 5.8 ug/L |
| Thousand Oaks, CA 2024 annual report | 0–5.4 ug/L |
| Henderson, NV 2024 annual report | 4.3 ug/L |
| Fort Worth, TX 2024 annual report | 3.1 ug/L |
| Glendale, CA 2024 annual report | 3.1 ug/L |
| Inglewood, CA 2023 annual report | 3.1 ug/L |
| Los Angeles LADWP, CA 2023 annual report | 3.1 ug/L |
| Oxnard, CA 2024 annual report | 3.1 ug/L |
| Simi Valley, CA 2024 annual report | 3.1 ug/L |
| Cary, NC 2025 annual report | 0–3 ug/L |
| Daly City, CA 2024 annual report | 3 ug/L |
| San Francisco SFPUC, CA 2023 annual report | 3 ug/L |
| Gilbert, AZ 2024 annual report | 2.9 ug/L |
| Huntington Beach, CA 2025 annual report | 2.4 ug/L |
| Costa Mesa, CA 2024 annual report | 2 ug/L |
| Fullerton, CA 2024 annual report | 2 ug/L |
| Norman, OK 2024 annual report | 2 ug/L |
| Pomona, CA 2024 annual report | 2 ug/L |
| City of Cupertino, CA 2024 annual report | 1.7 ug/L |
| San Jose, CA 2024 annual report | 1.7 ug/L |
| El Cajon, CA 2024 annual report | 1.6 ug/L |
| San Diego, CA 2023 annual report | 1.6 ug/L |
| Dallas, TX 2024 annual report | 1.12 ug/L |
| Renton, WA 2024 annual report | 0.7 ug/L |
| Burbank, CA 2024 annual report | 0.6 ug/L |
| Lincoln, NE 2025 annual report | 0.57 |
| Antioch, CA 2024 annual report | Not detected ug/L |
| City of Antioch, CA 2024 annual report | Not detected ug/L |
| City of Brentwood, CA 2024 annual report | Not detected ug/L |
| City of Brentwood, CA 2024 annual report | Not detected ug/L |
| City of Hampton, VA 2024 annual report | Not detected ug/L |
| City of Martinez, CA 2024 annual report | Not detected ug/L |
| City of Martinez, CA 2024 annual report | Not detected ug/L |
| City of Newport News, VA 2025 annual report | Not detected ug/L |
| City of Pittsburg, CA 2024 annual report | Not detected ug/L |
| City of Pittsburg, CA 2024 annual report | Not detected ug/L |
| City of Poquoson, VA 2025 annual report | Not detected ug/L |
| City of Poquoson, VA 2024 annual report | Not detected ug/L |
| Concord, CA 2024 annual report | Not detected ug/L |
| Detroit, MI 2023 annual report | Not detected ug/L |
| Diablo Water District, CA 2024 annual report | Not detected ug/L |
| Diablo Water District, CA 2024 annual report | Not detected ug/L |
| Golden State Water Company, CA 2024 annual report | Not detected ug/L |
| Golden State Water Company, CA 2024 annual report | Not detected ug/L |
| Hampton, VA 2025 annual report | Not detected ug/L |
| Irvine, CA 2023 annual report | Not detected ug/L |
| James City County, VA 2025 annual report | Not detected ug/L |
| James City County, VA 2024 annual report | Not detected ug/L |
Showing 50 of 63. 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 Public health goal for Bromate is 0.1 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?
37 of the 132 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.