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EWG's Tap Water Database — 2021 UPDATE

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Heptachlor epoxide

California Water Service (CWS) - Salinas

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND170ND
2015ND80ND
2016ND10ND
2017ND50ND
2018ND220ND
2019ND430ND

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
2014-02-059590-046-1402ND
2014-02-129590-103-1355ND
2014-02-129590-102-1320ND
2014-02-129590-123-0934ND
2014-02-199590-106-1142ND
2014-05-079590-102-1424ND
2014-05-079590-103-1450ND
2014-05-139590-123-1031ND
2014-05-159590-046-1112ND
2014-08-049590-103-1411ND
2014-08-049590-046-1046ND
2014-08-049590-102-0909ND
2014-08-049590-123-0938ND
2014-11-129590-123-1407ND
2014-11-129590-103-0951ND
2014-11-129590-102-1028ND
2014-11-199590-046-1455ND
2015-02-079590-102-1105ND
2015-02-079590-103-1045ND
2015-02-079590-123-1139ND
2015-02-259590-046-1416ND
2015-05-149590-123-1436ND
2015-05-149590-102-1555ND
2015-05-149590-103-1505ND
2015-05-199590-046-1400ND
2016-12-299590-008-1413ND
2017-01-199590-014-1048ND
2017-03-029590-132-1100ND
2017-04-059590-005-1428ND
2017-11-219590-131-1240ND
2017-12-149590-132-1456ND
2018-02-019590-102-0955ND
2018-02-019590-103-1043ND
2018-02-069590-024-1030ND
2018-03-199590-123-1200ND
2018-03-209590-132-0953ND
2018-05-019590-103-1010ND
2018-05-019590-019-0943ND
2018-05-029590-102-0858ND
2018-05-039590-123-0928ND
2018-06-079590-132-1033ND
2018-08-029590-019-1056ND
2018-09-049590-132-1034ND
2018-10-029590-009-0928ND
2018-10-099590-018-1140ND
2018-10-299590-020-1318ND
2018-11-069590-104-0936ND
2018-11-079590-006-1026ND
2018-11-089590-024-1201ND
2018-11-209590-027-1346ND
2018-12-069590-132-1148ND
2018-12-069590-037-1016ND
2018-12-189590-015-0944ND
2019-01-039590-022-1009ND
2019-01-039590-009-1359ND
2019-01-239590-041-1311ND
2019-01-299590-018-1411ND
2019-02-059590-017-1431ND
2019-02-059590-026-1409ND
2019-02-069590-027-0924ND
2019-02-209590-104-1139ND
2019-02-209590-006-1031ND
2019-02-209590-019-0921ND
2019-03-069590-037-1024ND
2019-03-069590-132-0954ND
2019-03-149590-015-1443ND
2019-03-219590-023-1310ND
2019-04-019590-008-0915ND
2019-04-019590-022-1120ND
2019-04-029590-005-1406ND
2019-04-119590-041-1206ND
2019-05-019590-017-1232ND
2019-05-019590-026-1411ND
2019-05-089590-014-1433ND
2019-05-089590-019-1004ND
2019-06-129590-046-1030ND
2019-06-189590-106-1107ND
2019-06-189590-132-0948ND
2019-06-189590-023-1321ND
2019-07-029590-008-1020ND
2019-07-109590-029-0937ND
2019-07-169590-005-1130ND
2019-07-189590-030-1340ND
2019-07-189590-020-1120ND
2019-08-019590-014-1129ND
2019-09-129590-132-1442ND
2019-09-129590-046-1045ND
2019-09-129590-106-1057ND
2019-09-179590-131-1340ND
2019-09-259590-043-1242ND
2019-10-019590-029-1125ND
2019-10-039590-030-0940ND
2019-10-089590-020-0949ND
2019-12-039590-131-1013ND
2019-12-039590-132-0946ND
2019-12-059590-043-1357ND