Know Your Environment. Protect Your Health.

Diquat

Fort Johnson South Water System

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

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND120ND
2019N/A00N/A
2020N/A00N/A
2021ND60ND
2022N/A00N/A
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
2018-09-1135417514003ND
2018-09-1135417514002ND
2018-09-1135417514001ND
2018-09-1135417514002ND
2018-09-1135417514003ND
2018-09-1135417514001ND
2018-09-1335417861002ND
2018-09-1335417861003ND
2018-09-1335417861002ND
2018-09-1335417861001ND
2018-09-1335417861003ND
2018-09-1335417861001ND
2021-08-2435658936001ND
2021-08-2435658936004ND
2021-08-2435658936005ND
2021-08-2435658936006ND
2021-10-1335670389002ND
2021-10-1335670389003ND