Know Your Environment. Protect Your Health.

Diquat

Paw Penn District

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

 

37

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND30ND
2020ND160ND
2021ND10ND
2022ND10ND
2023ND150ND

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
2018-01-1138160801ND
2019-01-0942498901ND
2019-07-1545716201ND
2019-10-3143999701ND
2020-01-0621542590.00ND
2020-04-0622069249.00ND
2020-04-0622069220.00ND
2020-04-0822069438.00ND
2020-04-0822069380.00ND
2020-04-1422069351.00ND
2020-04-1622069409.00ND
2020-04-1622069467.00ND
2020-05-0622261477.00ND
2020-07-0122652388.00ND
2020-07-0122652301.00ND
2020-07-0122652272.00ND
2020-07-0922652214.00ND
2020-07-0922652330.00ND
2020-07-0922652243.00ND
2020-07-1322652359.00ND
2021-04-2124290978.00ND
2022-01-0525982868.00ND
2023-01-0528212758.00ND
2023-04-0628749310.00ND
2023-04-0628749478.00ND
2023-04-0628749439.00ND
2023-04-1328749424.00ND
2023-04-1328749368.00ND
2023-04-1328749339.00ND
2023-06-0729155719.00ND
2023-07-1329346867.00ND
2023-07-1329346817.00ND
2023-07-1329346788.00ND
2023-07-1329346885.00ND
2023-07-2029346701.00ND
2023-07-2029346759.00ND
2023-07-2029346757.00ND