Know Your Environment. Protect Your Health.

Diquat

Afton Public Works Authority

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

 

12

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
2020ND30ND
2021ND40ND
2022ND40ND
2023ND10ND

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
2020-05-11CE11057-01ND
2020-08-19CH19170-01ND
2020-10-05CJ05040-01ND
2021-01-04DA04019-01ND
2021-04-19DD19012-01ND
2021-07-19DG19040-01ND
2021-10-18DJ18014-01ND
2022-02-22EB22042-01ND
2022-05-03EE03131-01ND
2022-09-19EI19045-01ND
2022-11-07EK07041-01ND
2023-02-21FB21043-01ND