Know Your Environment. Protect Your Health.

Heptachlor epoxide

Tryon Road Special Utility District

NOTE: Tryon Road Special Utility District purchases water from Northeast Texas Municipal Water District which is required to test for heptachlor epoxide. Sample information shown below was taken by Northeast Texas Municipal Water District.

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)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND10ND
2020ND10ND
2021ND30ND
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

NOTE: Tryon Road Special Utility District purchases water from Northeast Texas Municipal Water District which is required to test for heptachlor epoxide. Sample information shown below was taken by Northeast Texas Municipal Water District.

Date Lab ID Result
2018-05-23Q1820769001ND
2019-02-25Q1907904006ND
2020-02-26Q2007390001ND
2021-02-09Q2103854001ND
2022-03-01Q2206887001ND
2023-01-18Q2302651004ND