Know Your Environment. Protect Your Health.

Diquat

Shreveport Water System

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

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND40ND
2020ND20ND
2021ND20ND
2022ND20ND
2023ND20ND

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
2018-01-0835367518001ND
2018-01-0835367518001ND
2019-02-1835449627001ND
2019-02-1835449627001ND
2019-07-2535485236001ND
2019-07-2535485236001ND
2020-03-1635538199001ND
2020-08-1135569895001ND
2021-02-1035612029004ND
2021-08-0535653536001ND
2022-01-2735693462009ND
2022-07-2735735463002ND
2023-01-3035776976001ND
2023-08-1535821479001ND