Endothall

City of Tulare

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	10	ND
2015	ND	4	ND
2016	N/A	0	N/A
2017	N/A	0	N/A
2018	ND	13	ND
2019	N/A	0	N/A

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
2014-08-28	5810-047-0845	ND
2014-08-28	5810-017-0715	ND
2014-08-28	5810-015-0755	ND
2014-08-28	5810-014-0645	ND
2014-08-28	5810-002-0730	ND
2014-08-28	5810-001-0840	ND
2014-12-10	5810-048-0915	ND
2014-12-10	5810-033-0800	ND
2014-12-10	5810-026-1120	ND
2014-12-10	5810-025-1025	ND
2015-06-26	5810-001-1130	ND
2015-06-26	5810-002-0740	ND
2015-06-26	5810-008-0845	ND
2015-06-26	5810-012-1015	ND
2018-09-20	5810-001-0930	ND
2018-09-20	5810-073-0730	ND
2018-09-20	5810-052-0715	ND
2018-09-20	5810-048-0830	ND
2018-09-20	5810-047-0830	ND
2018-09-20	5810-033-0820	ND
2018-12-20	5810-073-0812	ND
2018-12-20	5810-069-1015	ND
2018-12-20	5810-065-0845	ND
2018-12-20	5810-061-0855	ND
2018-12-20	5810-057-1300	ND
2018-12-20	5810-056-1220	ND
2018-12-20	5810-017-1020	ND