Know Your Environment. Protect Your Health.

Diquat

Pendleton Water Association

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

 

18

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
2021ND20ND
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
2018-02-2035375979001ND
2018-02-2035375979001ND
2018-08-0635409599001ND
2018-08-0635409599001ND
2019-03-1235454721001ND
2019-03-1235454721001ND
2019-08-0735488972001ND
2019-08-0735488972001ND
2019-09-0435495456001ND
2019-09-0435495456001ND
2020-02-1035529911001ND
2020-09-2235579669001ND
2021-01-2035606276002ND
2021-08-1835657244005ND
2022-02-2135699244001ND
2022-08-2935743858002ND
2023-02-2735782747002ND
2023-08-0735819671001ND