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Contaminant guide

Hexachlorocyclopentadiene in drinking water

The EPA limit for Hexachlorocyclopentadiene in drinking water is 50 µg/L. Of the 26,069 water suppliers tested, 288 had it detected.

50 µg/L
EPA limit (MCL)
1.1%
of suppliers detected it
(288/26,069)

What the EPA limit means

⚖️

50 µg/L

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

🎯

50 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 Hexachlorocyclopentadiene was found

The water suppliers reporting the highest levels, worst first.

SupplierCityStateLevel vs EPA limit
Riddle Farm Berlin MD
4.9 µg/L 9.8%
of the EPA limit 50 µg/L
Craven County Water System New Bern NC
1.17 µg/L 2.3%
of the EPA limit 50 µg/L
Aspc Lewis Complex Water System Buckeye AZ
1 µg/L 2%
of the EPA limit 50 µg/L
Rich Square, Town of Rich Square NC
0.9100 µg/L 1.8%
of the EPA limit 50 µg/L
Carthage, Town of Carthage NC
0.9000 µg/L 1.8%
of the EPA limit 50 µg/L
Intracoastal Water System West Plaquemine LA
0.8800 µg/L 1.8%
of the EPA limit 50 µg/L
City of Pocomoke City Pocomoke City MD
0.8300 µg/L 1.7%
of the EPA limit 50 µg/L
Baton Rouge Water Company Baton Rouge LA
0.5400 µg/L 1.1%
of the EPA limit 50 µg/L
Port Sulphur Water District Belle Chasse LA
0.5400 µg/L 1.1%
of the EPA limit 50 µg/L
Albemarle, City of Albemarle NC
0.4000 µg/L 0.8%
of the EPA limit 50 µg/L
Pointe a La Hache Water System Belle Chasse LA
0.3900 µg/L 0.8%
of the EPA limit 50 µg/L
West Wise Sud Bridgeport TX
0.3700 µg/L 0.7%
of the EPA limit 50 µg/L
City of Rose City Vidor TX
0.3400 µg/L 0.7%
of the EPA limit 50 µg/L
Otter Creek, Town of Otter Creek FL
0.3400 µg/L 0.7%
of the EPA limit 50 µg/L
Florida Village Florida NY
0.3300 µg/L 0.7%
of the EPA limit 50 µg/L
Sopris Village Hoa — CO
0.3100 µg/L 0.6%
of the EPA limit 50 µg/L
Icmsa Rossiter Indiana PA
0.3000 µg/L 0.6%
of the EPA limit 50 µg/L
City of Port Neches Port Neches TX
0.3000 µg/L 0.6%
of the EPA limit 50 µg/L
Fort Detrick Frederick MD
0.3000 µg/L 0.6%
of the EPA limit 50 µg/L
Newell Warnock Wa Loveland CO
0.3000 µg/L 0.6%
of the EPA limit 50 µg/L
Saxton Muni Water Auth Saxton PA
0.3000 µg/L 0.6%
of the EPA limit 50 µg/L
Albert Gallatin Muni Auth Point Marion PA
0.3000 µg/L 0.6%
of the EPA limit 50 µg/L
Vallenar View Mobile Home Park Ketchikan AK
0.3000 µg/L 0.6%
of the EPA limit 50 µg/L
Icmsa Cherrytree Indiana PA
0.3000 µg/L 0.6%
of the EPA limit 50 µg/L
Veolia Mechanicsburg — PA
0.3000 µg/L 0.6%
of the EPA limit 50 µg/L

Frequently asked questions about Hexachlorocyclopentadiene

What is Hexachlorocyclopentadiene in drinking water?

Hexachlorocyclopentadiene 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 Hexachlorocyclopentadiene?

The EPA's Maximum Contaminant Level for Hexachlorocyclopentadiene is 50 µg/L, and its health goal (MCLG) is 50 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 Hexachlorocyclopentadiene in US tap water?

Of the 26,069 water suppliers with results on file, 288 detected Hexachlorocyclopentadiene — 1.1% of those tested.