Disinfection byproducts
Chloroform in U.S. tap water
67 public water systems across 14 U.S. states report Chloroform in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
What it is
A trihalomethane formed when chlorine reacts with organic matter in water.
Why it's regulated
A component of regulated total trihalomethanes; long-term exposure is linked to liver and kidney effects.
Within the federal limit (4)
| Water system | Measured |
|---|---|
| Glen Meadow Retirement Community, MD 2024 annual report | Not detected ug/L |
| La Canada Irrigation Dist. — La Canada, Ca, CA 2022 annual report | Not detected |
| La Canada Irrigation Dist. — La Canada, Ca, CA 2023 annual report | Not detected |
| La Canada Irrigation Dist. — La Canada, Ca, CA 2020 annual report | Not detected |
Frequently asked
+What is Chloroform?
A trihalomethane formed when chlorine reacts with organic matter in water. A component of regulated total trihalomethanes; long-term exposure is linked to liver and kidney effects.
+What is the federal limit for Chloroform in drinking water?
The federal Public health goal for Chloroform is 0.4 . 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 Chloroform over the federal limit?
Zero of the 67 public water systems in The Water Map dataset currently report Chloroform at or above its federal limit.
+How can I check if Chloroform 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 Chloroform.