Know Your Environment. Protect Your Health.

Diquat

Pennsylvania American Water Company Warren

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
2019ND10ND
2020ND80ND
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
2019-08-2746272501ND
2020-04-0622151842.00ND
2020-04-1522151870.00ND
2020-05-0622347223.00ND
2020-05-1322347295.00ND
2020-07-0822736956.00ND
2020-07-1522736884.00ND
2020-08-1322934668.00ND
2020-08-1922934696.00ND
2023-04-0328837798.00ND
2023-04-1128837742.00ND
2023-06-1329240328.00ND
2023-06-1929240329.00ND
2023-08-1529636976.00ND
2023-08-1629636978.00ND
2023-09-0529827540.00ND
2023-09-1229827596.00ND