Know Your Environment. Protect Your Health.

Diquat

Ephrata Area Joint Authority

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
2018N/A00N/A
2019N/A00N/A
2020ND80ND
2021N/A00N/A
2022N/A00N/A
2023ND80ND

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
2020-04-0622168911.00ND
2020-04-1322169077.00ND
2020-04-1322169078.00ND
2020-04-1622365693.00ND
2020-07-1322754007.00ND
2020-07-1322754008.00ND
2020-07-1422754068.00ND
2020-07-1722952569.00ND
2023-04-1429056927.00ND
2023-04-1429057126.00ND
2023-04-1429056929.00ND
2023-04-1429056928.00ND
2023-07-1129654724.00ND
2023-07-1829654891.00ND
2023-08-0929844084.00ND
2023-08-2929844123.00ND