Know Your Environment. Protect Your Health.

Diquat

Belmont Waterworks Inc.

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
2020ND30ND
2021ND20ND
20220.160 ppb21ND - 0.320 ppb
2023ND30ND

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
2020-03-0235534888001ND
2020-03-0235534888002ND
2020-03-0235534888003ND
2021-07-1435648064001ND
2021-10-0535668355001ND
2022-02-0135694942003ND
2022-07-21357344080020.320 ppb
2023-04-1035792383001ND
2023-04-1035792383002ND
2023-04-1035792383003ND