Know Your Environment. Protect Your Health.

Diquat

Riverdale Subdivision

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

 

9

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND10ND
2020ND10ND
2021ND10ND
2022ND10ND
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
2018-02-2138859101-DIQND
2018-05-1639301001-DIQND
2018-08-2240588001-DIQND
2018-11-1941796901-DIQND
2019-02-2743169601-DIQND
2020-02-1748249301-DIQND
2021-02-0953345601ND
2022-02-2857715801ND
2023-02-1361986201ND