Know Your Environment. Protect Your Health.

Heptachlor epoxide

Medfield Estates S/d

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

 

18

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.00625 ppb41ND - 0.0250 ppb
2019ND10ND
20200.0128 ppb42ND - 0.0260 ppb
20210.00367 ppb61ND - 0.0220 ppb
2022ND20ND
20230.0300 ppb110.0300 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
2018-02-05CA18367-010.0250 ppb
2018-04-05CB03434-02ND
2018-04-12CB05700-01ND
2018-05-02CB06590-01ND
2019-04-16CC04241-01ND
2020-01-08CC20032-010.0260 ppb
2020-04-28CD04738-01ND
2020-07-21CD08305-01ND
2020-10-07CD13713-010.0250 ppb
2021-01-20CD18671-01ND
2021-05-20CE02776-01ND
2021-05-20CE02776-02ND
2021-05-20CE02776-03ND
2021-05-20CE02776-04ND
2021-08-18CE07560-010.0220 ppb
2022-01-25CE17864-01ND
2022-06-15CF02387-01ND
2023-03-08752-4138-10.0300 ppb