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Contaminant guide

Heptachlor in drinking water

The EPA limit for Heptachlor in drinking water is 0.4000 µg/L. Of the 26,133 water suppliers tested, 45 had it detected.

0.4000 µg/L
EPA limit (MCL)
0.2%
of suppliers detected it
(45/26,133)

What the EPA limit means

⚖️

0.4000 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 was found

The water suppliers reporting the highest levels, worst first.

SupplierCityStateLevel vs EPA limit
Seminole - Big Cypress Hollywood FL
0.4000 µg/L 100%
of the EPA limit 0.4000 µg/L
Lexington, City of Lexington NE
0.1920 µg/L 48%
of the EPA limit 0.4000 µg/L
College View Park Columbus NE
0.1110 µg/L 28%
of the EPA limit 0.4000 µg/L
Blackberry Hill Southeast NY
0.1100 µg/L 27%
of the EPA limit 0.4000 µg/L
Nwwa Warrington Township North Wales PA
0.1100 µg/L 27%
of the EPA limit 0.4000 µg/L
Mountain Brook Homes Southeast NY
0.1000 µg/L 25%
of the EPA limit 0.4000 µg/L
Faith Farms Ministries Boynton Beach FL
0.1000 µg/L 25%
of the EPA limit 0.4000 µg/L
Lauradale S/D Jacksonville NC
0.0946 µg/L 24%
of the EPA limit 0.4000 µg/L
Kaskaskia Water District New Athens IL
0.0930 µg/L 23%
of the EPA limit 0.4000 µg/L
East Lyme Water & Sewer Commission East Lyme CT
0.0880 µg/L 22%
of the EPA limit 0.4000 µg/L
Bristol, City of Water System Bristol FL
0.0700 µg/L 18%
of the EPA limit 0.4000 µg/L
Kenansville, Town of Kenansville NC
0.0645 µg/L 16%
of the EPA limit 0.4000 µg/L
Oasis Mhp Northbrook IL
0.0540 µg/L 13%
of the EPA limit 0.4000 µg/L
Sage Pointe Hoa Sterling CO
0.0500 µg/L 13%
of the EPA limit 0.4000 µg/L
Creekside South Estates Metro District — CO
0.0500 µg/L 13%
of the EPA limit 0.4000 µg/L
Burgaw, Town of Burgaw NC
0.0499 µg/L 12%
of the EPA limit 0.4000 µg/L
Sycamore Sycamore IL
0.0490 µg/L 12%
of the EPA limit 0.4000 µg/L
Asheville City of Asheville NC
0.0459 µg/L 11%
of the EPA limit 0.4000 µg/L
East Side Mhp Rantoul IL
0.0450 µg/L 11%
of the EPA limit 0.4000 µg/L
Washoe Tribe Carson Colony Carson Colony NV
0.0400 µg/L 10%
of the EPA limit 0.4000 µg/L
Louviers Wsd Castle Rock CO
0.0400 µg/L 10%
of the EPA limit 0.4000 µg/L
Waverly Water System Lake Wales FL
0.0400 µg/L 10%
of the EPA limit 0.4000 µg/L
Goshen W.D. #1 (Hambletonian Park) Goshen NY
0.0310 µg/L 7.8%
of the EPA limit 0.4000 µg/L
Choctaw - Tucker Choctaw MS
0.0300 µg/L 7.5%
of the EPA limit 0.4000 µg/L
Seminole - Brighton Reservation Hollywood FL
0.0125 µg/L 3.1%
of the EPA limit 0.4000 µg/L

Frequently asked questions about Heptachlor

What is Heptachlor in drinking water?

Heptachlor 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?

The EPA's Maximum Contaminant Level for Heptachlor is 0.4000 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 in US tap water?

Of the 26,133 water suppliers with results on file, 45 detected Heptachlor — 0.2% of those tested.