Know Your Environment. Protect Your Health.

Diquat

Metropolitan Utilities District

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

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND60ND
2019ND100ND
2020N/A00N/A
2021ND60ND
2022N/A00N/A
2023ND20ND

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
2018-04-24546099ND
2018-04-24546100ND
2018-04-24546101ND
2018-09-17561299ND
2018-09-17561297ND
2018-09-17561298ND
2019-05-01605635ND
2019-05-01605636ND
2019-06-10605638ND
2019-06-10605634ND
2019-06-10605637ND
2019-09-23621602ND
2019-09-23621601ND
2019-09-23621604ND
2019-09-23621605ND
2019-09-23621603ND
2021-04-21729574ND
2021-04-21729573ND
2021-04-21729572ND
2021-09-27747853ND
2021-09-27747851ND
2021-09-27747852ND
2023-01-17844799ND
2023-01-17844798ND