Know Your Environment. Protect Your Health.

Diquat

Star Sewer and Water District Water System

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

 

10

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
2020ND20ND
2021ND60ND
2022ND20ND
2023N/A00N/A

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
2020-10-20S2052526ND
2020-10-20S2052524ND
2021-02-03S2105168ND
2021-02-03S2105166ND
2021-05-05S2121351ND
2021-05-05S2121353ND
2021-07-07S2134009ND
2021-07-07S2134007ND
2022-09-07S2244167ND
2022-10-12S2251116ND