Know Your Environment. Protect Your Health.

Diquat

Bristol Water Department

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
2018ND10ND
2019N/A00N/A
2020ND40ND
2021ND10ND
2022N/A00N/A
2023ND40ND

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
2018-07-09D8G0647-01SOCND
2020-02-26D0B2110-01SOCND
2020-02-26D0B2110-02SOCND
2020-02-26D0B2110-03SOCND
2020-02-26D0B2110-04SOCND
2021-02-25D1B2160-01SOCND
2023-03-06D3C0647-01SOCND
2023-03-06D3C0647-02SOCND
2023-03-06D3C0647-03SOCND
2023-03-15D3C1379-02SOCND