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Contaminant guide

Heptachlor Epoxide in drinking water

The EPA limit for Heptachlor Epoxide in drinking water is 0.2000 µg/L. Of the 26,133 water suppliers tested, 159 had it detected.

0.2000 µg/L
EPA limit (MCL)
0.6%
of suppliers detected it
(159/26,133)

What the EPA limit means

⚖️

0.2000 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 Heptachlor Epoxide 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
Dartmouth Water Division Dartmouth MA
6 µg/L 3000%
of the EPA limit, at the 95th percentile of samples — 0.2000 µg/L
Blair, City of Blair NE
0.4000 µg/L 200%
of the EPA limit, at the 95th percentile of samples — 0.2000 µg/L
Taylor Manor Republican City (Rr Name Repub NE
0.2890 µg/L 144%
of the EPA limit, at the 95th percentile of samples — 0.2000 µg/L
Grand Island, City of Grand Island NE
0.2200 µg/L 110%
of the EPA limit, at the 95th percentile of samples — 0.2000 µg/L
Jones County Water System Trenton NC
0.1900 µg/L 95%
of the EPA limit 0.2000 µg/L
New Baltimore Regional Warrenton VA
0.1800 µg/L 90%
of the EPA limit 0.2000 µg/L
Gibbon, City of Gibbon NE
0.1750 µg/L 87%
of the EPA limit 0.2000 µg/L
Aloha Gardens Utilities New Port Richey FL
0.1700 µg/L 85%
of the EPA limit 0.2000 µg/L
Riddle Farm Berlin MD
0.1700 µg/L 85%
of the EPA limit 0.2000 µg/L
Ashebrook Park Gastonia NC
0.1680 µg/L 84%
of the EPA limit 0.2000 µg/L
Sterlingshire S/D Greensboro NC
0.1620 µg/L 81%
of the EPA limit 0.2000 µg/L
Middlesex Water System Middlesex NC
0.1542 µg/L 77%
of the EPA limit 0.2000 µg/L
Northwest Grayson County Wcid 1 Gordonville TX
0.1500 µg/L 75%
of the EPA limit 0.2000 µg/L
Royal Acres S/D Raleigh NC
0.1287 µg/L 64%
of the EPA limit 0.2000 µg/L
Upland, Village of Upland NE
0.1280 µg/L 64%
of the EPA limit 0.2000 µg/L
Blackberry Hill Southeast NY
0.1100 µg/L 55%
of the EPA limit 0.2000 µg/L
Westwood S/D Holiday FL
0.1050 µg/L 52%
of the EPA limit 0.2000 µg/L
Oak Hill Water Company, Llc Waldorf MD
0.1000 µg/L 50%
of the EPA limit 0.2000 µg/L
Harbour Light Estates Community Salisbury MD
0.1000 µg/L 50%
of the EPA limit 0.2000 µg/L
Mountain Brook Homes Southeast NY
0.1000 µg/L 50%
of the EPA limit 0.2000 µg/L
Coronado Shores Water System Silverton TX
0.1000 µg/L 50%
of the EPA limit 0.2000 µg/L
Eden Mobile Home Park — MD
0.1000 µg/L 50%
of the EPA limit 0.2000 µg/L
Holiday Gardens Util Inc Holiday FL
0.1000 µg/L 50%
of the EPA limit 0.2000 µg/L
Dalewood-Monteray Wtr System Gastonia NC
0.0959 µg/L 48%
of the EPA limit 0.2000 µg/L
Rolling Acres S/D Raleigh NC
0.0900 µg/L 45%
of the EPA limit 0.2000 µg/L

Frequently asked questions about Heptachlor Epoxide

What is Heptachlor Epoxide in drinking water?

Heptachlor Epoxide 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 Heptachlor Epoxide?

The EPA's Maximum Contaminant Level for Heptachlor Epoxide is 0.2000 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 Heptachlor Epoxide in US tap water?

Of the 26,133 water suppliers with results on file, 159 detected Heptachlor Epoxide — 0.6% of those tested.