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EWG's Tap Water Database — 2021 UPDATE

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Heptachlor

Doylestown Borough Water Department

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

 

19

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND100ND
2015N/A00N/A
2016N/A00N/A
2017ND90ND
2018N/A00N/A
2019N/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
2014-02-25L4943098-1ND
2014-02-25L4943098-5ND
2014-02-25L4943098-4ND
2014-02-25L4943098-3ND
2014-02-25L4943098-2ND
2014-08-26L5114559-3ND
2014-08-26L5114559-4ND
2014-08-26L5114559-2ND
2014-08-26L5114559-5ND
2014-08-26L5114559-1ND
2017-01-1615782478ND
2017-01-1615503205ND
2017-01-1615782547ND
2017-01-1615503273ND
2017-01-1615782443ND
2017-01-1615503170ND
2017-01-1615782512ND
2017-01-1615503239ND
2017-01-1815503301ND