Know Your Environment. Protect Your Health.

Diquat

North Penn Water Authority

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

 

30

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
2020ND220ND
2021N/A00N/A
2022N/A00N/A
2023ND80ND

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
2020-04-0122022932.00ND
2020-04-0122023051.00ND
2020-04-0122023021.00ND
2020-04-0122022961.00ND
2020-04-0122022991.00ND
2020-04-0122023129.00ND
2020-04-1322023343.00ND
2020-04-1322023313.00ND
2020-04-1322023283.00ND
2020-04-1322023253.00ND
2020-05-0422215385.00ND
2020-07-0622607327.00ND
2020-07-0622607357.00ND
2020-07-0622607387.00ND
2020-07-0622607297.00ND
2020-07-0622608056.00ND
2020-08-1022799607.00ND
2020-08-1022799577.00ND
2020-08-1022799487.00ND
2020-08-1222799547.00ND
2020-08-1222799517.00ND
2020-08-3122999386.00ND
2023-04-1228702835.00ND
2023-04-1228702833.00ND
2023-04-1228702836.00ND
2023-04-1228702834.00ND
2023-07-1929498003.00ND
2023-07-1929498005.00ND
2023-07-1929498004.00ND
2023-07-1929498002.00ND