Know Your Environment. Protect Your Health.

Heptachlor epoxide

City of Woodway

NOTE: City of Woodway purchases water from City of Waco which is required to test for heptachlor epoxide. Sample information shown below was taken by City of Waco.

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

 

13

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND20ND
2020ND60ND
2021ND50ND
2022ND30ND
2023ND40ND

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

NOTE: City of Woodway purchases water from City of Waco which is required to test for heptachlor epoxide. Sample information shown below was taken by City of Waco.

Date Lab ID Result
2018-01-09AE08463ND
2018-01-09AE08464ND
2019-01-23AE51053ND
2019-01-23AE51054ND
2020-02-05AE97177ND
2020-02-05AE97178ND
2020-02-05AE97179ND
2021-03-17AF47324ND
2021-03-17AF47325ND
2022-01-26AF82013ND
2022-01-26AF82015ND
2023-03-01AG31198ND
2023-05-10AG40106ND