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Contaminant guide

1,1,1-Trichloroethane in drinking water

The EPA limit for 1,1,1-Trichloroethane in drinking water is 200 µg/L. Of the 34,528 water suppliers tested, 160 had it detected.

200 µg/L
EPA limit (MCL)
0.5%
of suppliers detected it
(160/34,528)

What the EPA limit means

⚖️

200 µg/L

Maximum Contaminant Level — the enforceable ceiling a supplier must stay under.

🎯

200 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 1,1,1-Trichloroethane 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.

SupplierCityStateLevel vs EPA limit
Choctaw - Tucker Choctaw MS
450.025 µg/L 225%
of the EPA limit, at the 95th percentile of samples — 200 µg/L
Grafton Waterworks Grafton WI
55.4 µg/L 28%
of the EPA limit 200 µg/L
Grafton Water District Grafton MA
26 µg/L 13%
of the EPA limit 200 µg/L
Bets Water System Coupeville WA
24.05 µg/L 12%
of the EPA limit 200 µg/L
Madisonburg Water Works Madisonburg PA
23.61 µg/L 12%
of the EPA limit 200 µg/L
Town of Hempstead Water Department Hempstead NY
19.32 µg/L 9.7%
of the EPA limit 200 µg/L
Hillcrest Water District Southeast NY
13 µg/L 6.5%
of the EPA limit 200 µg/L
Plainview Wd — —
11.44 µg/L 5.7%
of the EPA limit 200 µg/L
Hicksville Wd Oyster Bay NY
9.725 µg/L 4.9%
of the EPA limit 200 µg/L
Garden City Garden City NY
7.72 µg/L 3.9%
of the EPA limit 200 µg/L
High Bridge W Dept High Bridge boro-1014 NJ
6.94 µg/L 3.5%
of the EPA limit 200 µg/L
Jericho Wd Oyster Bay NY
6.64 µg/L 3.3%
of the EPA limit 200 µg/L
Coraopolis Water & Sewer Auth Coraopolis PA
6.13 µg/L 3.1%
of the EPA limit 200 µg/L
Umh Arbor Estates — WV
5.7175 µg/L 2.9%
of the EPA limit 200 µg/L
Rockford Rockford IL
4.675 µg/L 2.3%
of the EPA limit 200 µg/L
Milford City Pws — OH
4.474 µg/L 2.2%
of the EPA limit 200 µg/L
Walnutport Mobile Court Walnutport PA
3.9 µg/L 2%
of the EPA limit 200 µg/L
Perkasie Regional Authority Sellersville PA
3.84 µg/L 1.9%
of the EPA limit 200 µg/L
Brookfield Housing Authority Brookfield CT
3.77 µg/L 1.9%
of the EPA limit 200 µg/L
Easton Water Div Easton MA
3.625 µg/L 1.8%
of the EPA limit 200 µg/L
Hempstead Hempstead NY
3.515 µg/L 1.8%
of the EPA limit 200 µg/L
Vanport Twp Muni Auth Vanport PA
3.314 µg/L 1.7%
of the EPA limit 200 µg/L
Hinsdale Town Water District Hinsdale NY
3.295 µg/L 1.6%
of the EPA limit 200 µg/L
San Jose Water San Jose CA
3.2 µg/L 1.6%
of the EPA limit 200 µg/L
Mineola Mineola NY
3.1 µg/L 1.6%
of the EPA limit 200 µg/L

Frequently asked questions about 1,1,1-Trichloroethane

What is 1,1,1-Trichloroethane in drinking water?

1,1,1-Trichloroethane is monitored in US public drinking water under EPA rules. Each supplier's result is reported to the EPA and published here with its source and period.

What is the EPA limit for 1,1,1-Trichloroethane?

The EPA's Maximum Contaminant Level for 1,1,1-Trichloroethane is 200 µg/L, and its health goal (MCLG) is 200 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 1,1,1-Trichloroethane in US tap water?

Of the 34,528 water suppliers with results on file, 160 detected 1,1,1-Trichloroethane — 0.5% of those tested.