Know Your Environment. Protect Your Health.

Diquat

Cecilia Water Corporation

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

 

21

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
2019ND60ND
2020ND50ND
2021ND40ND
20220.0667 ppb31ND - 0.200 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
2019-02-1835449808002ND
2019-02-1835449808003ND
2019-02-1835449808001ND
2019-02-1835449808002ND
2019-02-1835449808003ND
2019-02-1835449808001ND
2020-03-3035540639001ND
2020-09-2835581253002ND
2020-09-2835581253003ND
2020-12-0735597474004ND
2020-12-0735597474003ND
2021-02-0135608904003ND
2021-02-0135608904004ND
2021-05-0335630992003ND
2021-05-0335630992004ND
2022-01-3135694190001ND
2022-01-3135694190002ND
2022-01-31356941900030.200 ppb
2023-02-1335779756005ND
2023-11-0635840310001ND
2023-11-0635840310002ND