Know Your Environment. Protect Your Health.

Diquat

Mt. Joy Boro Authority

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

 

17

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
2020ND90ND
2021N/A00N/A
2022N/A00N/A
2023ND60ND

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
2019-08-209083654-01ND
2019-11-079110611-01ND
2020-03-0321981419.00ND
2020-04-0922170944.00ND
2020-04-0922171111.00ND
2020-05-1922368369.00ND
2020-06-1022565230.00ND
2020-07-2122955050.00ND
2020-08-1122955134.00ND
2020-09-2223142299.00ND
2020-09-2223142329.00ND
2023-05-0929059151.00ND
2023-05-1629059183.00ND
2023-06-0529260257.00ND
2023-08-0129657077.00ND
2023-08-0229657078.00ND
2023-08-1529846310.00ND