Know Your Environment. Protect Your Health.

Diquat

Erie City Water Authority

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

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND30ND
2020ND40ND
2021N/A00N/A
2022N/A00N/A
2023ND40ND

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
2018-01-083849224ND
2018-05-213941484ND
2018-08-214030515ND
2019-05-214302822ND
2019-09-104415506ND
2019-11-184489102ND
2020-04-0122141721.00ND
2020-05-1822336497.00ND
2020-08-2622923665.00ND
2020-09-2323112736.00ND
2023-04-0428825998.00ND
2023-04-1828826400.00ND
2023-08-0929625435.00ND
2023-09-1429816652.00ND