Know Your Environment. Protect Your Health.

Heptachlor epoxide

Lafayette Utilities Water System

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

 

64

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND200ND
2019ND140ND
2020ND70ND
2021ND140ND
2022ND60ND
2023ND30ND

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
2018-03-0535378308005ND
2018-03-0535378308001ND
2018-03-0535378308005ND
2018-03-0535378308004ND
2018-03-0535378308003ND
2018-03-0535378308002ND
2018-03-0535378308001ND
2018-03-0535378308002ND
2018-03-0535378308003ND
2018-03-0535378308004ND
2018-04-3035389627001ND
2018-04-3035389627001ND
2018-05-1435392629001ND
2018-05-1435392629001ND
2018-06-1935399735001ND
2018-06-1935399735001ND
2018-06-1935399735002ND
2018-06-1935399735003ND
2018-06-1935399735003ND
2018-06-1935399735002ND
2019-01-1435442609001ND
2019-01-1435442609002ND
2019-01-1435442609001ND
2019-01-1435442609002ND
2019-08-1235490056002ND
2019-08-1235490056004ND
2019-08-1235490056003ND
2019-08-1235490056002ND
2019-08-1235490056001ND
2019-08-1235490056005ND
2019-08-1235490056004ND
2019-08-1235490056003ND
2019-08-1235490056001ND
2019-08-1235490056005ND
2020-07-2035564847003ND
2020-07-2035564847002ND
2020-07-2035564847001ND
2020-09-0835576522002ND
2020-09-0835576522001ND
2020-11-2435594841003ND
2020-11-2435594841002ND
2021-02-0835610875003ND
2021-02-0835610875002ND
2021-02-0835610872005ND
2021-02-0835610872004ND
2021-02-0835610872003ND
2021-02-0835610872001ND
2021-02-0835610872002ND
2021-06-1435641565001ND
2021-06-2135642603003ND
2021-06-2135642603005ND
2021-06-2135642603004ND
2021-06-2135642603002ND
2021-06-2135642603001ND
2021-06-2135642592001ND
2022-05-2335720206001ND
2022-05-2335720206002ND
2022-05-2335720206003ND
2022-05-2335720206004ND
2022-05-2335720206005ND
2022-05-2335720206006ND
2023-05-2235801891004ND
2023-05-2235801891005ND
2023-05-2235801891006ND