Know Your Environment. Protect Your Health.

Heptachlor epoxide

Terra Bella Irrigation District - Tbt

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

 

8

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019N/A00N/A
2020ND10ND
2021ND10ND
2022ND10ND
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
2018-09-24CA5410038_027_027-201809241445ND
2018-09-24CA5410038_032_032-201809241300ND
2018-12-27CA5410038_027_027-201812271250ND
2018-12-27CA5410038_032_032-201812271200ND
2020-08-27CA5410038_001_001-202008271300ND
2021-05-27CA5410038_028_028-202105271235ND
2022-09-19CA5410038_028_028-202209191305ND
2023-07-24CA5410038_001_001-202307241220ND