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EWG's Tap Water Database — 2019 UPDATE

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Heptachlor epoxide

City of Surprise - Mountain Vista

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

 

92

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND160ND
2013ND160ND
2014ND160ND
2015ND120ND
2016ND170ND
2017ND150ND

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
2012-01-262012012-04SND
2012-01-262012012-03SND
2012-01-262012012-02SND
2012-01-262012012-01SND
2012-04-252042001-01SND
2012-04-252042000-01SND
2012-04-252041999-01SND
2012-04-252041994-01SND
2012-08-152081291-01SND
2012-08-152081287-01SND
2012-08-162081359-01SND
2012-09-042090143-01SND
2012-11-142111028-01SND
2012-11-142111027-01SND
2012-11-142111026-01SND
2012-11-142111024-01SND
2013-01-233011767-04ND
2013-01-233011767-03ND
2013-01-233011767-02ND
2013-01-233011767-01ND
2013-04-243041986-01SND
2013-04-243041985-01SND
2013-04-243041987-01SND
2013-04-243041989-01SND
2013-07-163071369-01SND
2013-07-163071367-01SND
2013-07-163071366-01SND
2013-07-163071362-01SND
2013-10-173101633-01ND
2013-10-173101632-01ND
2013-10-173101631-01ND
2013-10-173101630-01ND
2014-01-224011817-04SND
2014-01-224011817-01SND
2014-01-224011817-02SND
2014-01-224011817-03SND
2014-04-224041931-01ND
2014-04-224041930-01ND
2014-04-224041927-01ND
2014-04-234041928-01ND
2014-07-304072667-01SND
2014-07-304072665-01SND
2014-07-304072658-01SND
2014-07-304072656-01SND
2014-10-284102394-01SND
2014-10-284102393-01SND
2014-10-284102387-01ND
2014-10-294102491-01SND
2015-01-215011694-04ND
2015-04-205041746-01SND
2015-04-205041743-01SND
2015-04-205041742-01ND
2015-04-205041741-01ND
2015-07-285072564-01SND
2015-07-295072676-01SND
2015-07-295072682-01SND
2015-07-305072799-02SND
2015-10-125101379-01SND
2015-10-125101373-01ND
2015-10-125101369-01ND
2016-01-256012035-04TND
2016-01-256012035-03TND
2016-01-256012035-03SND
2016-01-256012035-02TND
2016-01-256012035-01TND
2016-04-266042222-01SND
2016-04-266042223-01SND
2016-04-266042227-01SND
2016-04-266042226-01SND
2016-07-266072329-01SND
2016-07-266072325-01SND
2016-07-266072323-01SND
2016-07-266072321-01SND
2016-10-246102137-01SND
2016-10-246102135-01SOCND
2016-10-246102133-01SND
2016-10-246102131-01SND
2017-01-307012591-03SND
2017-01-307012591-01SND
2017-01-307012591-02SND
2017-01-307012591-04SND
2017-04-207041996-01SOCND
2017-04-207041995-01SOCND
2017-04-207041987-01SOCND
2017-07-197071806-01SOCND
2017-07-197071805-01SOCND
2017-07-197071804-01SOCND
2017-07-197071802-01SOCND
2017-10-117101207-01SOCND
2017-10-117101207-04SOCND
2017-10-117101207-03SOCND
2017-10-117101207-02SOCND