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EWG's Tap Water Database — 2021 UPDATE

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Heptachlor epoxide

WA of Great Neck North

Heptachlor epoxide is a breakdown product of heptachlor, a highly toxic and carcinogenic pesticide banned in the U.S. since the 1980s.

MORE ABOUT THIS CONTAMINANT

 

76

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.00150 ppb141ND - 0.0210 ppb
2015ND130ND
2016ND110ND
2017ND130ND
2018ND100ND
2019ND150ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.006 ppb

The EWG Health Guideline of 0.006 ppb for heptachlor epoxide 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) 0.2 ppb

The legal limit for heptachlor epoxide, 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.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-221401936-001-SOCS0.0210 ppb
2014-01-291401C13-001-SOCSND
2014-05-071405482-001-SOCSND
2014-05-281405J52-001-SOCSND
2014-06-251406I69-001-SOCSND
2014-06-301406L80-001ND
2014-07-021407155-001-SOCSND
2014-07-151407B47-002-SOCSND
2014-07-151407B47-001-SOCSND
2014-07-231407G56-002-SOCSND
2014-07-231407G56-001-SOCSND
2014-08-141408873-001-POCSND
2014-08-201408E56-001ND
2014-10-151410A21-001ND
2015-02-111502700-001ND
2015-03-041503285-001-SOCSND
2015-03-101503586-001-SOCSND
2015-04-221504M39-001-SOCSND
2015-05-131505961-001-SOCSND
2015-05-191505D38-001-SOCSND
2015-05-271505J24-001-SOCSND
2015-06-171506E39-001-SOCSND
2015-07-011507073-001-SOCSND
2015-07-081507543-001-SOCSND
2015-07-221507G03-001-SOCSND
2015-08-051508394-001ND
2015-08-121508A11-001-SOCSND
2016-06-221606M90-001-SOCSND
2016-06-221606M90-002-SOCSND
2016-07-061607368-002-SOCSND
2016-07-061607368-001-SOCSND
2016-07-131607999-001-SOCSND
2016-07-201607H11-001-SOCSND
2016-07-201607H11-002-SOCSND
2016-07-271607O22-001-SOCSND
2016-07-271607O22-002-SOCSND
2016-08-031608402-001-SOCSND
2016-08-101608B21-001-SOCSND
2017-06-157021485001-SOCSND
2017-08-017025952002-SOCSND
2017-08-027025952001-SOCSND
2017-08-107026786001ND
2017-08-107026786002ND
2017-08-167027412001-SOCSND
2017-08-177027471001-SOCSND
2017-08-177027471002-SOCSND
2017-08-237028018001ND
2017-08-247028538001ND
2017-08-247028089001ND
2017-08-247028089002ND
2017-12-217038763001ND
2018-03-217046046001ND
2018-06-187055315001ND
2018-07-187058663002ND
2018-07-187060047001ND
2018-07-187058663001ND
2018-07-257059409001ND
2018-08-017060047002ND
2018-08-027060228001ND
2018-09-197065376002ND
2018-09-197065376001ND
2019-08-0770100283001ND
2019-08-0770100283002ND
2019-08-0770100283003ND
2019-08-1470101314003ND
2019-08-1470101314001ND
2019-08-1470101314002ND
2019-08-2170102284002ND
2019-08-2170102284003ND
2019-08-2870103083002ND
2019-08-2870102284001ND
2019-08-2870103083001ND
2019-09-2570106219002ND
2019-10-0370107228001ND
2019-10-0970107901005ND
2019-10-1670108703006ND