Know Your Environment. Protect Your Health.

Diquat

State College Boro Water Auth.

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

 

20

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
2020ND100ND
2021N/A00N/A
2022N/A00N/A
2023ND100ND

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
2020-05-1322292185.00ND
2020-05-1322292158.00ND
2020-05-1322292266.00ND
2020-05-1322292212.00ND
2020-05-1322292239.00ND
2020-08-1723069128.00ND
2020-08-1722876893.00ND
2020-08-1722876870.00ND
2020-08-1722876913.00ND
2020-09-2223069443.00ND
2023-05-1528981623.00ND
2023-05-1528981614.00ND
2023-05-1528981637.00ND
2023-05-1528981651.00ND
2023-05-1528981605.00ND
2023-08-1429577850.00ND
2023-08-1629578216.00ND
2023-08-1629578158.00ND
2023-08-1629578245.00ND
2023-08-1629578187.00ND