Know Your Environment. Protect Your Health.

Diquat

Bryan County Rural Water District #9

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

 

25

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
2020ND120ND
2021ND70ND
2022ND50ND
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
2020-03-02SDWA-1470003-00ND
2020-03-02SDWA-1470003-09ND
2020-03-02SDWA-1470004-00ND
2020-03-02SDWA-1470004-09ND
2020-03-02SDWA-1470005-00ND
2020-03-02SDWA-1470005-09ND
2020-03-02SDWA-1470054-00ND
2020-03-02SDWA-1470054-15ND
2020-09-01SDWA-1516099-00ND
2020-09-01SDWA-1516100-00ND
2020-09-01SDWA-1516101-00ND
2020-09-01SDWA-1516075-00ND
2021-09-09SDWA-1603650-00ND
2021-09-09SDWA-1603649-00ND
2021-09-09SDWA-1603648-00ND
2021-11-02SDWA-1641421-00ND
2021-11-02SDWA-1641474-00ND
2021-11-02SDWA-1641423-00ND
2021-11-02SDWA-1641422-00ND
2022-03-07SDWA-1674251-00ND
2022-04-20SDWA-1684779-00ND
2022-04-20SDWA-1684806-00ND
2022-04-20SDWA-1684830-00ND
2022-04-20SDWA-1684848-00ND
2023-12-15SDWA-1859120-00ND