Endothall

City of Lewiston

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	1	ND
2015	ND	6	ND
2016	ND	5	ND
2017	ND	3	ND
2018	ND	4	ND
2019	ND	4	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
2014-02-25	S140226039-001	ND
2015-01-21	S2150122025-001	ND
2015-07-22	S150723044-003	ND
2015-07-22	S150723044-002	ND
2015-07-22	S150723044-001	ND
2015-08-19	S150819036-002	ND
2015-08-19	S150819036-001	ND
2016-02-09	S160209050-002	ND
2016-04-06	S160407008-003	ND
2016-04-06	S160407008-002	ND
2016-04-06	S160407008-001	ND
2016-05-16	S160518056-001	ND
2017-03-28	S170328050-001	ND
2017-09-19	S170920029-003	ND
2017-09-19	S170920029-004	ND
2018-02-21	S180221045-001	ND
2018-02-22	S180223004-001	ND
2018-12-13	S181213011-002	ND
2018-12-13	S181213011-001	ND
2019-01-24	S190124017-001	ND
2019-04-23	S190423067-002	ND
2019-04-23	S190423067-001	ND
2019-08-14	S190814080-001	ND