Know Your Environment. Protect Your Health.

Diquat

California Water Service Company Oak Hills

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

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND20ND
2020N/A00N/A
2021ND10ND
2022ND20ND
2023N/A00N/A

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
2018-03-27CA2710019_001_001-201803271038ND
2019-06-19CA2710019_008_008-201906191322ND
2019-09-12CA2710019_003_003-201909121402ND
2021-06-29CA2710019_001_001-202106291352ND
2022-06-22CA2710019_008_008-202206221334ND
2022-09-22CA2710019_003_003-202209221411ND