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.
Trichloroethylene by state
Every state where a public water system reports Trichloroethylene in its annual report, ranked by systems at or above the federal limit.
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.
+Which states report the most Trichloroethylene in their drinking water?
Of the systems on The Water Map, California (3 systems at or above the limit) report the most Trichloroethylene exceedances. The state-by-state table on this page lists every state.
+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.