Know Your Environment. Protect Your Health.

Heptachlor epoxide

Orangewood Water System

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

 

36

Samples

0

Samples exceeding legal limit (MCL)

22

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0400 ppb330.0290 ppb - 0.0500 ppb
20190.0383 ppb330.0360 ppb - 0.0430 ppb
20200.0218 ppb125ND - 0.0780 ppb
20210.0257 ppb330.0220 ppb - 0.0300 ppb
20220.0250 ppb330.0210 ppb - 0.0290 ppb
20230.0115 ppb125ND - 0.0340 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 Result
2018-12-040.0410 ppb
2018-12-040.0500 ppb
2018-12-040.0290 ppb
2019-02-070.0360 ppb
2019-02-070.0430 ppb
2019-02-070.0360 ppb
2020-06-03ND
2020-06-03ND
2020-06-03ND
2020-06-040.0640 ppb
2020-06-040.0780 ppb
2020-06-04ND
2020-09-080.0200 ppb
2020-09-080.0560 ppb
2020-09-080.0430 ppb
2020-09-09ND
2020-09-09ND
2020-09-09ND
2021-06-020.0220 ppb
2021-06-020.0300 ppb
2021-06-020.0250 ppb
2022-04-110.0250 ppb
2022-04-110.0210 ppb
2022-04-110.0290 ppb
2023-03-14ND
2023-03-140.0280 ppb
2023-03-210.0260 ppb
2023-03-210.0340 ppb
2023-03-22ND
2023-03-22ND
2023-03-22ND
2023-08-15ND
2023-08-15ND
2023-08-15ND
2023-08-150.0220 ppb
2023-08-150.0280 ppb