Disinfection byproducts
Bromodichloromethane in U.S. tap water
56 public water systems across 12 U.S. states report Bromodichloromethane 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 cancer and reproductive effects.
At or above the federal limit (1)
| Water system | Measured | vs. limit |
|---|---|---|
| Pomona, CA 2024 annual report | 0–7.1 ug/L | 7.1× the limit |
Within the federal limit (2)
| Water system | Measured |
|---|---|
| Charleston, SC 2024 annual report | 5.6 ug/L |
| North Charleston, SC 2024 annual report | 5.6 ug/L |
Frequently asked
+What is Bromodichloromethane?
A trihalomethane disinfection byproduct. Counted within regulated total trihalomethanes; long-term exposure is associated with cancer and reproductive effects.
+What is the federal limit for Bromodichloromethane in drinking water?
The federal MCLG for Bromodichloromethane 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 Bromodichloromethane over the federal limit?
1 of the 56 public water systems on The Water Map report Bromodichloromethane at or above its federal limit, spanning 12 U.S. states. The full list is on this page.
+How can I check if Bromodichloromethane 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 Bromodichloromethane.