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EWG's Tap Water Database

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Heptachlor

Status: National drinking water standard exists

 

Heptachlor is an insecticide used for termite control until 1988. It is linked to cancer, hormone disruption and neurotoxicity.

2015:

FOUND
FOUND ABOVE HEALTH GUIDELINES

2

states detected

4

utilities detected

24,739

people served

1

states over health guideline

3

utilities over health guideline

23,260

people served over health guideline

Health concerns for heptachlor

Cancer

Hormone disruption

Harm to the brain and nervous system

State and national drinking water standards and health guidelines

Health Guideline 0.008 ppb

The health guideline of 0.008 ppb for heptachlor was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

ppb = parts per billion.

EPA Maximum Contaminant
Level (MCL) 0.4 ppb

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppb = parts per billion.

EPA Maximum Contaminant
Level Goal (MCLG)0 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

States reporting heptachlor in drinking water

UTILITIES REPORTING ABOVE HEALTH GUIDELINES UTILITIES WITH CONTAMINATION
State UtilitiesPeople Served UtilitiesPeople Served
North Carolina323,260323,260
Florida0011,479
MORE
LESS

Utilities with the highest amounts of heptachlor, 2015

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
Kenansville, Town of*Kenansville, NC1 of 40.0161 ppb855
Moore County Public Util-seven LakCarthage, NC1 of 40.0132 ppb6,405
Waverly Water SystemLake Wales, FL1 of 40.00238 ppb1,479

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report Heptachlor, but it likely has the contaminant in its water supply.

UtilityLocationTestsAverage levelPeople served