Know Your Environment. Protect Your Health.

Diquat

Worthington

NOTE: Worthington purchases water from Lewis and Clark Regional Water System which is required to test for diquat. Sample information shown below was taken by Lewis and Clark Regional Water System.

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

 

4

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
2019ND20ND
2020N/A00N/A
2021ND10ND
2022ND30ND
2023N/A00N/A

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

NOTE: Worthington purchases water from Lewis and Clark Regional Water System which is required to test for diquat. Sample information shown below was taken by Lewis and Clark Regional Water System.

Date Lab ID Result
2019-05-01ND
2019-07-22ND
2022-06-14228802ND
2022-08-08228802ND