Know Your Environment. Protect Your Health.

Diquat

Woodbury

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

 

32

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
2020N/A00N/A
2021ND160ND
2022ND140ND
2023ND20ND

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
2021-08-184990523ND
2021-08-184990521ND
2021-08-184990519ND
2021-08-184990535ND
2021-08-184990537ND
2021-08-184990539ND
2021-08-184990556ND
2021-11-167789-2ND
2021-11-167789-1ND
2021-11-167789-3ND
2021-11-167789-4ND
2021-11-167789-5ND
2021-11-167789-6ND
2021-11-167789-7ND
2021-11-167789-8ND
2021-11-167789-9ND
2022-02-1414920-2ND
2022-02-1414930-3ND
2022-02-1414930-2ND
2022-02-1414930-1ND
2022-02-1414920-4ND
2022-02-1414920-3ND
2022-02-1414920-1ND
2022-05-0523869-7ND
2022-05-0523869-6ND
2022-05-0523869-5ND
2022-05-0523869-4ND
2022-05-0523869-3ND
2022-05-0523869-2ND
2022-05-0523869-1ND
2023-09-1978216-1ND
2023-12-2088916-1ND