Diquat

Village of Georgetown Water Supply

NOTE: Village of Georgetown Water Supply purchases water from Red Hill Waterworks Inc. which is required to test for diquat. Sample information shown below was taken by Red Hill Waterworks Inc..

Diquat is a herbicide used on potato crops and aquatic weeds.

MORE ABOUT THIS CONTAMINANT

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	ND	2	ND
2018	N/A	0	N/A
2019	ND	6	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 6 ppb

The EWG Health Guideline of 6 ppb for diquat 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 cataracts.

EPA Maximum Contaminant
Level (MCL) 20 ppb

The legal limit for diquat, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s.

ppb = parts per billion

All test results

NOTE: Village of Georgetown Water Supply purchases water from Red Hill Waterworks Inc. which is required to test for diquat. Sample information shown below was taken by Red Hill Waterworks Inc..

Date	Lab ID	Result
2016-02-04	35228303005	ND
2016-02-04	35228303004	ND
2016-02-04	35228303003	ND
2016-02-04	35228303004	ND
2016-02-04	35228303005	ND
2016-02-04	35228303003	ND
2016-12-08	35282709004	ND
2016-12-08	35282709005	ND
2016-12-08	35282709006	ND
2016-12-08	35282709006	ND
2016-12-08	35282709005	ND
2016-12-08	35282709004	ND
2017-10-17	35342600001	ND
2017-10-17	35342600001	ND
2019-09-13	35498092001	ND
2019-09-13	35498092003	ND
2019-09-13	35498092002	ND
2019-09-13	35498092001	ND
2019-09-13	35498092003	ND
2019-09-13	35498092002	ND