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EWG's Tap Water Database — 2021 UPDATE

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Heptachlor

Cottonwood Municipal Water Vv6

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

MORE ABOUT THIS CONTAMINANT

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
2016ND120ND
2017N/A00N/A
2018N/A00N/A
2019ND120ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.008 ppb

The EWG 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.

EPA Maximum Contaminant
Level (MCL) 0.4 ppb

The legal limit for heptachlor, established in 1991, was based on analytical detection limits at the time that the standard was set. This limit may not fully protect against the risk of cancer due to heptachlor exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2016-03-07201603090133SND
2016-03-08201603090138SND
2016-03-08201603090137SND
2016-03-08201603090136SND
2016-03-08201603090135SND
2016-03-08201603090134SND
2016-08-23201608240087SND
2016-08-23201608240092SND
2016-08-23201608240091SND
2016-08-23201608240090SND
2016-08-23201608240089SND
2016-08-23201608240088SND
2019-02-19201902200073SND
2019-02-19201902200072SND
2019-02-19201902200071SND
2019-02-19201902200070SND
2019-02-19201902200069SND
2019-02-19201902200068SND
2019-05-07201905080028SND
2019-05-07201905080033SND
2019-05-07201905080032SND
2019-05-07201905080031SND
2019-05-07201905080030SND
2019-05-07201905080029SND