Know Your Environment. Protect Your Health.

Diquat

North Wales Water Authority

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

 

34

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
2020ND200ND
2021N/A00N/A
2022N/A00N/A
2023ND140ND

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
2020-04-0122025478.00ND
2020-04-2022026083.00ND
2020-04-2022026173.00ND
2020-04-2022026113.00ND
2020-04-2022026143.00ND
2020-04-2722217305.00ND
2020-04-2722217275.00ND
2020-04-2722217335.00ND
2020-04-2722217394.00ND
2020-04-2722217365.00ND
2020-07-0622609701.00ND
2020-07-2722801142.00ND
2020-07-2722801169.00ND
2020-07-2722801112.00ND
2020-07-2722801202.00ND
2020-07-2722801082.00ND
2020-08-3123001503.00ND
2020-08-3123001475.00ND
2020-08-3123001419.00ND
2020-08-3123001447.00ND
2023-04-0328704928.00ND
2023-04-0328704927.00ND
2023-04-0328704931.00ND
2023-04-0328704930.00ND
2023-04-0328704929.00ND
2023-04-0428704932.00ND
2023-06-0529110379.00ND
2023-07-1029304293.00ND
2023-07-1029304292.00ND
2023-07-1029304290.00ND
2023-07-1029304289.00ND
2023-07-1129304294.00ND
2023-07-1129304291.00ND
2023-07-1129304295.00ND