Know Your Environment. Protect Your Health.

Diquat

Purcell

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

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND30ND
2020ND20ND
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
2018-08-14AH14157-01ND
2018-10-16AJ16112-01ND
2019-01-14BA14043-01ND
2019-04-08BD08052-01ND
2019-08-13BH13107-01ND
2020-01-28CA28074-01ND
2020-04-21CD21100-01ND
2021-01-19DA19096-01ND
2021-06-08DF08176-01ND
2022-06-14EF14181-01ND
2022-11-15EK15124-01ND
2023-06-06FF06135-01ND
2023-08-15FH15158-01ND
2023-10-17FJ17136-01ND
2023-12-05FL05129-01ND