Heptachlor epoxide

Waikoloa

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

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	N/A	0	N/A
2014	ND	18	ND
2015	N/A	0	N/A
2016	N/A	0	N/A
2017	ND	6	ND
2018	N/A	0	N/A
2019	N/A	0	N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2014-08-18	201408190818	ND
2014-08-18	201408190804	ND
2014-08-18	201408190818	ND
2014-08-18	201408190804	ND
2014-09-08	C14-09-0036	ND
2014-09-08	C14-09-0035A	ND
2014-09-08	C14-09-0036	ND
2014-09-08	C14-09-0035A	ND
2014-09-15	201409180857	ND
2014-09-15	201409180857	ND
2014-11-10	201411110095	ND
2014-11-10	201411110094	ND
2014-11-10	201411110094	ND
2014-11-10	201411110095	ND
2014-12-01	C14-12-0047	ND
2014-12-01	C14-12-0048	ND
2014-12-01	C14-12-0047	ND
2014-12-01	C14-12-0048	ND
2017-04-10		ND
2017-04-10		ND
2017-07-17		ND
2017-07-17		ND
2017-08-16		ND
2017-08-16		ND