Endothall

Cal-water Service Company - Chico

Endothall is a herbicide used to kill aquatic plants and algae. It's also used on potato and cotton crops.

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	2	ND
2015	ND	1	ND
2016	ND	13	ND
2017	ND	3	ND
2018	N/A	0	N/A
2019	ND	9	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 94 ppb

The EWG Health Guideline of 94 ppb for endothall 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 harm to the stomach and intestines.

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for endothall, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1960s.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-01-14	5810-140-1248	ND
2014-04-23	5810-140-0930	ND
2015-07-14	5810-052-0700	ND
2016-12-19	9590-007-1155	ND
2016-12-19	9590-063-1115	ND
2016-12-19	9590-074-1045	ND
2016-12-19	9590-049-0915	ND
2016-12-19	9590-075-0900	ND
2016-12-19	9590-041-0919	ND
2016-12-22	5810-031-0650	ND
2016-12-28	9590-064-0953	ND
2016-12-28	9590-059-0845	ND
2016-12-29	9590-038-0807	ND
2016-12-29	9590-032-1205	ND
2016-12-29	9590-054-0928	ND
2016-12-29	9590-062-0815	ND
2017-03-22	9590-038-1143	ND
2017-04-12	9590-017-1053	ND
2017-05-10	9590-032-0855	ND
2019-12-03	5810-038-0900	ND
2019-12-09	5810-064-0850	ND
2019-12-10	5810-062-0800	ND
2019-12-10	5810-075-1328	ND
2019-12-11	5810-074-0937	ND
2019-12-11	5810-041-1038	ND
2019-12-12	5810-054-1030	ND
2019-12-16	5810-049-1153	ND
2019-12-17	5810-059-1050	ND