Know Your Environment. Protect Your Health.

Diquat

Upper Hanover Water Authority

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
2020ND70ND
2021N/A00N/A
2022N/A00N/A
2023ND130ND

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
2020-03-2021847978.00ND
2020-03-2021847976.00ND
2020-03-2021847977.00ND
2020-06-1822417351.00ND
2020-06-1822417354.00ND
2020-06-1822417352.00ND
2020-06-1822417353.00ND
2023-02-2828703074.00ND
2023-02-2828703076.00ND
2023-02-2828703075.00ND
2023-05-2429108931.00ND
2023-05-2429108933.00ND
2023-05-2429108932.00ND
2023-08-2129700636.00ND
2023-08-2129700635.00ND
2023-08-2229700637.00ND
2023-11-1330246610.00ND
2023-11-1330246582.00ND
2023-11-1430246554.00ND
2023-11-2830246526.00ND