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Contaminant guide

1,1-Dichloroethylene in drinking water

The EPA limit for 1,1-Dichloroethylene in drinking water is 7 µg/L. Of the 34,526 water suppliers tested, 224 had it detected.

7 µg/L
EPA limit (MCL)
0.6%
of suppliers detected it
(224/34,526)

What the EPA limit means

⚖️

7 µg/L

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

🎯

7 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-Dichloroethylene 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
South Adams County Wsd Commerce City CO
76.105 µg/L 1087%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Glendale-City, Water Dept. Glendale CA
40 µg/L 571%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Pomona - City, Water Dept. Pomona CA
28 µg/L 400%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Hicksville Wd Oyster Bay NY
20.8 µg/L 297%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Garden City Garden City NY
18.265 µg/L 261%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Lake Mary, City of Lake Mary FL
17.4 µg/L 249%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Ardmore Water System Ardmore TN
17.23 µg/L 246%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Grafton Waterworks Grafton WI
17 µg/L 243%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Town of Hempstead Water Department Hempstead NY
16.99 µg/L 243%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Harbor House S/D Charlotte NC
16.6 µg/L 237%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Plainview Wd — —
16.15 µg/L 231%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
City of Idalou Idalou TX
16.12 µg/L 230%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Gswc - Norwalk — CA
14 µg/L 200%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Jericho Wd Oyster Bay NY
13.23 µg/L 189%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Liberty, Town of Liberty NC
12.21 µg/L 174%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
San Gabriel Valley Water Co.-El Monte El Monte CA
12 µg/L 171%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Country Acres/Southgate Gastonia NC
11.26 µg/L 161%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
City of Broussard Hwy 90 Water System — LA
11.18 µg/L 160%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Mineola Mineola NY
11 µg/L 157%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Mountain View Mobile Estates, Llc — CA
9.39 µg/L 134%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Los Angeles-City, Dept. of Water & Power Los Angeles CA
9.116 µg/L 130%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Christian Life Center Lubbock TX
8.798 µg/L 126%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Ramona Water Company Anza CA
8.375 µg/L 120%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Wa of Western Nassau North Hempstead NY
7.5 µg/L 107%
of the EPA limit, at the 95th percentile of samples — 7 µg/L
Valley County Water Dist. Baldwin Park CA
7.4 µg/L 106%
of the EPA limit, at the 95th percentile of samples — 7 µg/L

Frequently asked questions about 1,1-Dichloroethylene

What is 1,1-Dichloroethylene in drinking water?

1,1-Dichloroethylene 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-Dichloroethylene?

The EPA's Maximum Contaminant Level for 1,1-Dichloroethylene is 7 µg/L, and its health goal (MCLG) is 7 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-Dichloroethylene in US tap water?

Of the 34,526 water suppliers with results on file, 224 detected 1,1-Dichloroethylene — 0.6% of those tested.