VOCs & pesticides · 2024
Trichloroethylene in Ontario, CA tap water
Ontario, CA's 2024 Trichloroethylene measurement is below the federal limit of 5 ug/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Reported level Local Groundwater | 0.78 ug/L | 5 ug/L MCL |
Verbatim from Ontario, CA's 2024 Consumer Confidence Report — source document ↗
About Trichloroethylene
An industrial solvent (TCE) used in metal degreasing.
A known human carcinogen; long-term exposure above the federal limit can damage the liver.
How Ontario, CA compares
1 of the 32 systems measuring Trichloroethylene on The Water Map have it at or above the federal limit:
Nearby systems also reporting Trichloroethylene:
People also ask
+Is there Trichloroethylene in Ontario, CA tap water?
Yes — Ontario, CA's 2024 Consumer Confidence Report lists Trichloroethylene at 0.78 ug/L. Ontario, CA's 2024 Trichloroethylene measurement is below the federal limit of 5 ug/L (MCL).
+What's 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 (running annual average or 90th percentile), not a single-sample spike.
+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.
+Which other U.S. cities have Trichloroethylene over the federal limit?
1 of the 32 systems on The Water Map measuring Trichloroethylene report it at or above the federal limit. Examples include El Monte, CA.
+Where does this Trichloroethylene measurement come from?
This page reproduces the Trichloroethylene entry from the 2024 Consumer Confidence Report published by the Ontario, CA water utility — the annual drinking-water report every U.S. utility is required by federal law to publish. The original source document is archived at /water/ca/ontario/2024/source.