Know Your Environment. Protect Your Health.

Diquat

Salem Public Works

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

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND30ND
2020ND40ND
2021ND20ND
2022ND20ND
2023ND40ND

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
2018-01-24201801250239-SND
2019-02-07201902080338-SND
2019-08-15201908160799-SND
2019-10-10201910110546-SND
2020-02-03202002040118-SND
2020-04-08202004090573-SND
2020-05-18202005190119-SND
2020-07-30202007310210-SND
2021-02-16202102170345-SND
2021-05-10202105110678-SND
2022-02-16202202180003ND
2022-06-23380-6930-1-SND
2023-01-04380-33407-1-SND
2023-04-27380-45315-1-SND
2023-08-15380-59270-1-SND
2023-10-31380-69271-1-SND