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EWG's Tap Water Database — 2021 UPDATE

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Heptachlor

City of Westminster

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

MORE ABOUT THIS CONTAMINANT

 

31

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND70ND
2015ND50ND
2016ND60ND
2017ND60ND
2018ND50ND
2019ND20ND

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
2014-06-090060015_01_94579ND
2014-07-140060015_01_00014ND
2014-07-140060015_05_00014ND
2014-07-140060015_06_00014ND
2014-07-140060015_07_00014ND
2014-07-140060015_08_00014ND
2014-09-230060015_01_96356ND
2015-06-18101421ND
2015-08-26E16000776001ND
2015-08-260324AU2615ND
2015-09-11103073ND
2015-09-11103073BND
2016-05-23E16004418002ND
2016-06-15107975ND
2016-09-08E17001059013ND
2016-09-08E17001059005ND
2016-09-08E17001059002ND
2016-09-26110304ND
2017-01-31E17002940005ND
2017-01-31E17002940007ND
2017-01-31E17002940009ND
2017-05-31E17004691001ND
2017-06-22115325ND
2017-09-19117175ND
2018-02-27120150ND
2018-05-14E18004109001ND
2018-06-14122570ND
2018-09-11124887ND
2018-09-11E19000887001ND
2019-06-12130684ND
2019-09-17132881ND