VOCs & pesticides
Trichloroethylene in U.S. tap water
109 public water systems across 12 U.S. states report Trichloroethylene in their annual Consumer Confidence Report. 3 sit at or above the federal limit.
What it is
An industrial solvent (TCE) used in metal degreasing.
Why it's regulated
A known human carcinogen; long-term exposure above the federal limit can damage the liver.
At or above the federal limit (3)
| Water system | Measured | vs. limit |
|---|---|---|
| California Domestic Water Company — Whittier, Ca, CA 2021 annual report | 20.9 ug/L | 4.2× the limit |
| California Domestic Water Company — Whittier, Ca, CA 2020 annual report | 18.6 ug/L | 3.7× the limit |
| La Verne, City Wd — La Verne, Ca, CA 2020 annual report | 0–16 ug/L | 3.2× the limit |
Within the federal limit (106)
Showing 50 of 106. The full list is in the JSON API.
Frequently asked
+What is Trichloroethylene?
An industrial solvent (TCE) used in metal degreasing. A known human carcinogen; long-term exposure above the federal limit can damage the liver.
+What is the federal limit for Trichloroethylene in drinking water?
The federal MCL for Trichloroethylene is 5 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 Trichloroethylene over the federal limit?
3 of the 109 public water systems on The Water Map report Trichloroethylene at or above its federal limit, spanning 12 U.S. states. The full list is on this page.
+How can I check if Trichloroethylene 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 Trichloroethylene.