Know Your Environment. Protect Your Health.

Heptachlor epoxide

Cedar Village II

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

 

14

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0500 ppb220.0380 ppb - 0.0620 ppb
20190.0545 ppb220.0510 ppb - 0.0580 ppb
20200.0617 ppb330.0530 ppb - 0.0720 ppb
20210.0220 ppb21ND - 0.0440 ppb
20220.0110 ppb31ND - 0.0330 ppb
20230.0330 ppb220.0260 ppb - 0.0400 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
2018-05-14CB03013-010.0380 ppb
2018-07-16CB07912-010.0620 ppb
2019-06-18CC09646-010.0580 ppb
2019-08-02CC11195-010.0510 ppb
2020-03-16CD03791-010.0530 ppb
2020-06-18CD08933-010.0600 ppb
2020-08-20CD08934-010.0720 ppb
2021-06-30CE03348-010.0440 ppb
2021-07-09CE08316-01ND
2022-01-11CF00220-01ND
2022-06-12CF08337-01ND
2022-08-08CF11818-010.0330 ppb
2023-05-11752-6814-10.0400 ppb
2023-07-07752-9114-10.0260 ppb