Know Your Environment. Protect Your Health.

Diquat

Carthage

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

 

9

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND10ND
2020ND10ND
2021ND10ND
2022ND30ND
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
2018-05-0739201701ND
2019-04-0743308601ND
2020-05-182005E75-001END
2021-05-252105Q83-001FND
2022-04-262204M85-001GND
2022-07-062207405-001GND
2022-12-07FL02069-01ND
2023-01-12GA02520-01ND
2023-05-05GE01478-01ND