Endothall

Liberty Water Rio Rico

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	N/A	0	N/A
2015	N/A	0	N/A
2016	ND	12	ND
2017	N/A	0	N/A
2018	N/A	0	N/A
2019	ND	12	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
2016-05-18	3453953	ND
2016-05-18	3453947	ND
2016-05-18	3453941	ND
2016-05-18	3453935	ND
2016-06-27	3479517	ND
2016-06-27	3479511	ND
2016-08-23	3530512	ND
2016-08-23	3530542	ND
2016-08-23	3530536	ND
2016-08-23	3530530	ND
2016-08-23	3530524	ND
2016-08-23	3530518	ND
2019-04-09	4257188	ND
2019-04-09	4257182	ND
2019-04-09	4257176	ND
2019-04-09	4257170	ND
2019-04-09	4257164	ND
2019-04-09	4257158	ND
2019-08-12	4386017	ND
2019-08-12	4386061	ND
2019-08-12	4386055	ND
2019-08-12	4386049	ND
2019-08-12	4386029	ND
2019-08-12	4386023	ND