Endothall

Oxnard Water Department

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
2014	ND	1	ND
2015	N/A	0	N/A
2016	ND	5	ND
2017	ND	5	ND
2018	ND	4	ND
2019	ND	13	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
2014-11-19	9588-037-1021	ND
2016-03-16	9588-039-0829	ND
2016-03-17	9588-035-0917	ND
2016-03-17	9588-038-1007	ND
2016-03-22	9588-040-0855	ND
2016-03-22	9588-041-0943	ND
2017-07-19	9588-037-0847	ND
2017-08-09	9588-060-0850	ND
2017-08-09	9588-057-1020	ND
2017-08-16	9588-063-1005	ND
2017-08-16	9588-059-1055	ND
2018-11-14	9588-060-0934	ND
2018-11-14	9588-057-1020	ND
2018-11-21	9588-063-0944	ND
2018-11-28	9588-059-1056	ND
2019-04-17	9588-041-1040	ND
2019-04-17	9588-018-0810	ND
2019-04-17	9588-020-0929	ND
2019-04-24	9588-039-1134	ND
2019-05-01	9588-036-1044	ND
2019-05-15	9588-040-1130	ND
2019-06-19	9588-035-1028	ND
2019-06-26	9588-038-1002	ND
2019-07-17	9588-021-1247	ND
2019-09-18	9588-059-1107	ND
2019-10-02	9588-063-1222	ND
2019-10-16	9588-057-1112	ND
2019-11-20	9588-057-1124	ND