Disinfection byproducts
Bromoform in U.S. tap water
32 public water systems across 9 U.S. states report Bromoform in their annual Consumer Confidence Report. 1 sit at or above the federal limit.
What it is
A trihalomethane disinfection byproduct.
Why it's regulated
Counted within regulated total trihalomethanes; long-term exposure is associated with liver and kidney effects.
At or above the federal limit (1)
| Water system | Measured | vs. limit |
|---|---|---|
| Pomona, CA 2024 annual report | 0–7.7 ug/L | 7.7× the limit |
Within the federal limit (16)
| Water system | Measured |
|---|---|
| Charleston, SC 2024 annual report | 0.5 ug/L |
| North Charleston, SC 2024 annual report | 0.5 ug/L |
| City of Hampton, VA 2024 annual report | Not detected ug/L |
| City of Newport News, VA 2025 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 |
| Dayton, OH 2024 annual report | Not detected ug/L |
| Fort Worth, TX 2024 annual report | 0 ug/L |
| Hampton, VA 2025 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 |
| Nashville, TN 2023 annual report | Not detected |
| Newport News, VA 2024 annual report | Not detected ug/L |
| West Jordan, UT 2024 annual report | Not detected ug/L |
| York County, VA 2024 annual report | Not detected ug/L |
| York County, VA 2025 annual report | Not detected ug/L |
Frequently asked
+What is Bromoform?
A trihalomethane disinfection byproduct. Counted within regulated total trihalomethanes; long-term exposure is associated with liver and kidney effects.
+What is the federal limit for Bromoform in drinking water?
The federal MCLG for Bromoform 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 Bromoform over the federal limit?
1 of the 32 public water systems on The Water Map report Bromoform at or above its federal limit, spanning 9 U.S. states. The full list is on this page.
+How can I check if Bromoform 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 Bromoform.