Know Your Environment. Protect Your Health.

Diquat

Ruston Water System

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

 

22

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
2021N/A00N/A
2022N/A00N/A
2023ND100ND

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
2020-01-0735523111001ND
2020-01-1335524733008ND
2020-01-1335524733001ND
2020-01-1335524733002ND
2020-01-1335524733003ND
2020-01-1335524733004ND
2020-01-1335524733005ND
2020-01-1335524733006ND
2020-01-1335524733007ND
2020-06-2235558556001ND
2020-06-2235558556002ND
2020-12-0835597801001ND
2023-02-2735782669001ND
2023-02-2735782669002ND
2023-02-2735782669003ND
2023-02-2735782669004ND
2023-02-2735782669005ND
2023-03-0635784479001ND
2023-03-0635784479002ND
2023-03-0635784479003ND
2023-03-0635784479004ND
2023-03-0635784479005ND