Know Your Environment. Protect Your Health.

Heptachlor epoxide

San Antonio Water Company

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

 

19

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
2020ND100ND
2021N/A00N/A
2022N/A00N/A
2023ND90ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2020-04-07CA3610085_021_021-202004071020ND
2020-09-29CA3610085_016_016-202009291145ND
2020-09-29CA3610085_001_001-202009291040ND
2020-09-29CA3610085_018_018-202009290800ND
2020-10-06CA3610085_002_002-202010061100ND
2020-10-06CA3610085_013_013-202010061150ND
2020-10-06CA3610085_017_017-202010061130ND
2020-10-13CA3610085_011_011-202010130900ND
2020-10-13CA3610085_003_003-202010130830ND
2020-10-14CA3610085_004_004-202010140930ND
2023-04-20CA3610085_021_021-202304201200ND
2023-07-06CA3610085_003_003-202307061110ND
2023-07-06CA3610085_011_011-202307061155ND
2023-07-06CA3610085_013_013-202307061425ND
2023-07-06CA3610085_017_017-202307061400ND
2023-07-10CA3610085_001_001-202307101445ND
2023-07-10CA3610085_016_016-202307101515ND
2023-07-12CA3610085_002_002-202307121140ND
2023-07-12CA3610085_004_004-202307120930ND