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EWG's Tap Water Database — 2019 UPDATE

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Heptachlor

Johnson Utilities

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

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND60ND
2013N/A00N/A
2014N/A00N/A
2015ND40ND
2016ND20ND
2017N/A00N/A

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
2012-01-23201201240126SND
2012-01-23201201240134SND
2012-01-23201201240135SND
2012-07-26201207270229SND
2012-07-26201207270230SND
2012-07-26201207270231SND
2015-03-04201503040391SND
2015-03-04201508040390SND
2015-06-17201506170545SND
2015-06-17201506170546SND
2016-02-17201602180080SND
2016-10-27201610270264SND