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EWG's Tap Water Database — 2021 UPDATE

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Heptachlor

Colchester Commons

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

 

13

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND40ND
2015ND10ND
2016ND30ND
2017ND10ND
2018ND10ND
2019ND30ND

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
2014-02-19BG10471SOC2ND
2014-04-18BG34477SOC2ND
2014-07-29BG83661SOC2ND
2014-10-16BH28216SOC2ND
2015-04-24BJ07685SOC2ND
2016-03-24BK87904SOC2ND
2016-03-24BK87905SOC2ND
2016-03-24BK87906SOC2ND
2017-10-10BZ18334SOC2ND
2018-04-27CA37957SOC2ND
2019-10-21CE44558ND
2019-10-21CE44559ND
2019-10-21CE44556ND