Know Your Environment. Protect Your Health.

Diquat

West Jefferson Waterworks District 2

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

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND60ND
2020ND20ND
2021ND40ND
2022ND20ND
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
2018-01-3035371297004ND
2018-01-3035371297004ND
2018-10-0235421760001ND
2018-10-0235421760001ND
2019-02-0535446731001ND
2019-02-0535446731001ND
2019-04-1135461216001ND
2019-04-1135461216001ND
2019-08-1435490415001ND
2019-08-1435490415001ND
2020-03-1835538508001ND
2020-10-2635587646001ND
2021-01-2835608074001ND
2021-12-0835683670001ND
2021-12-0935683306001ND
2021-12-0935683322001ND
2022-01-1335690758001ND
2022-08-0435737248001ND
2023-02-0135777179001ND
2023-10-3135838752001ND