What Trichloroethylene is, and why it's regulated
What the EPA limit means
5 µg/L
Maximum Contaminant Level — the enforceable ceiling a supplier must stay under.
0.0 µg/L
Health goal (MCLG) — the level with no known health effect. It is a goal, not a legal limit, and is often zero for carcinogens.
SYR4
Where these measurements come from. Hover the tag for the EPA programme and years.
Where Trichloroethylene was found
The water suppliers reporting the highest levels, worst first. For lead and copper that is the 90th-percentile result the action level is written against; for Six-Year Review data, the 95th percentile of each system's samples.
| Supplier | City | State | Level vs EPA limit |
|---|---|---|---|
| Paris Water Works | Paris | KY | 428 µg/L 8560% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Glendale-City, Water Dept. | Glendale | CA | 190 µg/L 3800% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Burbank-City, Water Dept. | Burbank | CA | 99 µg/L 1980% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| La Puente Valley Cwd | La Puente | CA | 79.3 µg/L 1586% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| San Gabriel Valley Water Co.-El Monte | El Monte | CA | 61 µg/L 1220% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| El Monte-City, Water Dept. | El Monte | CA | 58 µg/L 1160% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Mountain View Mobile Estates, Llc | — | CA | 51.75 µg/L 1035% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Calif State Polytechnical Univ - Pomona | Pomona | CA | 42 µg/L 840% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Gswc - Norwalk | — | CA | 40.6 µg/L 812% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Valley County Water Dist. | Baldwin Park | CA | 40.1 µg/L 802% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Gswc - Florence/Graham | — | CA | 39 µg/L 780% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Perkasie Regional Authority | Sellersville | PA | 38.475 µg/L 770% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Grafton Waterworks | Grafton | WI | 31.05 µg/L 621% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Schofield Barracks | Schofield Barracks | HI | 28.28 µg/L 566% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Chino Basin Desalter Auth. - Desalter 1 | Ontario | CA | 28 µg/L 560% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| California Domestic Water Company | Whittier | CA | 28 µg/L 560% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Los Angeles-City, Dept. of Water & Power | Los Angeles | CA | 26.5 µg/L 530% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Modesto, City of | Modesto | CA | 24.1 µg/L 482% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| City of Alhambra | Alhambra | CA | 22 µg/L 440% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Commerce-City, Water Dept. | Montebello | CA | 21.0645 µg/L 421% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Santa Monica-City, Water Division | Santa Monica | CA | 20.03 µg/L 401% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Bethpage Wd | — | — | 20 µg/L 400% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Hillcrest Water District | Southeast | NY | 20 µg/L 400% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| Franklin Square Wd | Stewart Manor | NY | 19 µg/L 380% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
| City of Fresno | Fresno | CA | 18 µg/L 360% of the EPA limit, at the 95th percentile of samples — 5 µg/L |
Frequently asked questions about Trichloroethylene
What is Trichloroethylene in drinking water?
Trichloroethylene is an industrial degreasing solvent; it is a known human carcinogen.
What is the EPA limit for Trichloroethylene?
The EPA's Maximum Contaminant Level for Trichloroethylene is 5 µg/L, and its health goal (MCLG) is 0.0 µg/L. A result above the limit means the supplier must act; the goal is the level at which no health effects are expected.
How common is Trichloroethylene in US tap water?
Of the 34,526 water suppliers with results on file, 567 detected Trichloroethylene — 1.6% of those tested.