Know Your Environment. Protect Your Health.

Diquat

Pennsylvania American Water Company Yardley

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

 

12

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
2020ND60ND
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
2020-04-0922005570.00ND
2020-04-0922005598.00ND
2020-06-1122395819.00ND
2020-08-1222780358.00ND
2020-08-1222780414.00ND
2020-08-1222780386.00ND
2023-04-1128684260.00ND
2023-04-1728684288.00ND
2023-04-1728684317.00ND
2023-08-0929478392.00ND
2023-08-0929478421.00ND
2023-08-0929478437.00ND