Know Your Environment. Protect Your Health.

Heptachlor epoxide

Quail Ridge S/d

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

 

6

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0400 ppb110.0400 ppb
20190.0350 ppb110.0350 ppb
20200.0330 ppb110.0330 ppb
20210.0270 ppb110.0270 ppb
20220.0340 ppb110.0340 ppb
2023ND10ND

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
2018-12-05CB13982-010.0400 ppb
2019-10-10CC14464-010.0350 ppb
2020-11-11CD14839-010.0330 ppb
2021-11-09CE13139-010.0270 ppb
2022-12-20CF13045-010.0340 ppb
2023-11-15752-13853-1ND