Know Your Environment. Protect Your Health.

Diquat

Oakview Water Corporation

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

 

21

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
2020ND90ND
2021ND60ND
2022ND30ND
2023ND30ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2020-02-262002643ND
2020-03-04100104-01ND
2020-03-11100286-01ND
2020-07-14101916-01ND
2020-07-14101917-01ND
2020-07-14101918-01ND
2020-09-29103000-01ND
2020-09-29103001-01ND
2020-11-03103535-01ND
2021-03-09105357-01ND
2021-03-09105356-01ND
2021-03-10105358-01ND
2021-04-13105834-01ND
2021-04-13105835-01ND
2021-04-21105921-01ND
2022-04-05110971-01ND
2022-04-05110972-01ND
2022-07-12112482-01ND
2023-05-16117057-01ND
2023-05-16117058-01ND
2023-05-16117059-01ND