Know Your Environment. Protect Your Health.

Heptachlor epoxide

Ashebrook Park

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

 

13

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0740 ppb220.0510 ppb - 0.0970 ppb
20190.0480 ppb21ND - 0.0960 ppb
20200.0960 ppb220.0730 ppb - 0.119 ppb
20210.0825 ppb220.0790 ppb - 0.0860 ppb
20220.0790 ppb220.0670 ppb - 0.0910 ppb
20230.0967 ppb32ND - 0.200 ppb

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
2018-05-02CB02791-010.0510 ppb
2018-10-31CB13856-01RE10.0970 ppb
2019-05-01CC03170-010.0960 ppb
2019-10-16CC14382-01ND
2020-04-09CD03859-010.0730 ppb
2020-10-21CD14780-010.119 ppb
2021-04-28CE02402-010.0860 ppb
2021-11-16CE13026-010.0790 ppb
2022-05-12CF02923-010.0670 ppb
2022-11-15CF12933-010.0910 ppb
2023-05-24752-7564-10.0900 ppb
2023-11-01752-13279-10.200 ppb
2023-12-12752-14634-1ND