Diquat

Lake Bruin Water District #1

NOTE: Lake Bruin Water District #1 purchases water from Tensas Water District Association which is required to test for diquat. Sample information shown below was taken by Tensas Water District Association.

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

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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	2	ND
2015	ND	4	ND
2016	ND	4	ND
2017	ND	4	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 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

Date	Lab ID	Result
2014-03-17	AD89856	ND
2014-03-17	AD89856	ND
2015-03-03	35177844004	ND
2015-03-03	35177844004	ND
2015-09-16	35207972015	ND
2015-09-16	35207972015	ND
2016-01-11	35224622005	ND
2016-01-11	35224622005	ND
2016-09-07	35264598002	ND
2016-09-07	35264598002	ND
2017-01-09	35288675004	ND
2017-01-09	35288675004	ND
2017-09-25	35338816007	ND
2017-09-25	35338816007	ND
2018-01-08	35367824002	ND
2018-01-08	35367824002	ND
2018-07-30	35407878001	ND
2018-07-30	35407878001	ND
2019-01-14	35442603003	ND
2019-01-14	35442603003	ND
2019-07-31	35486747001	ND
2019-07-31	35486747001	ND