Know Your Environment. Protect Your Health.

Diquat

New Orleans Carrollton Waterworks

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

 

41

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND80ND
2019ND100ND
2020ND60ND
2021ND60ND
2022ND60ND
2023ND50ND

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
2018-03-1535380391002ND
2018-03-1535380391001ND
2018-03-1535380391001ND
2018-03-1535380391002ND
2018-08-1535411633001ND
2018-08-1535411633002ND
2018-08-1535411633002ND
2018-08-1535411633001ND
2019-04-1135461214001ND
2019-04-1135461215001ND
2019-04-1135461215001ND
2019-04-1135461214001ND
2019-08-0135486661001ND
2019-08-0135486665001ND
2019-08-0135486661001ND
2019-08-0135486665001ND
2019-09-1935499418001ND
2019-09-1935499418001ND
2020-03-2635540032001ND
2020-03-2635540029001ND
2020-03-2635540024001ND
2020-10-0835583702001ND
2020-10-0835583691001ND
2020-10-0835583701001ND
2021-03-2935622307001ND
2021-03-2935622309001ND
2021-03-2935622313001ND
2021-10-1435671090001ND
2021-10-1435671094001ND
2021-10-1435671099001ND
2022-03-1535704709001ND
2022-03-1535704707001ND
2022-03-1535704706001ND
2022-10-1335753420001ND
2022-10-1335753422001ND
2022-10-1335753419001ND
2023-03-0635783931001ND
2023-03-0635783938001ND
2023-03-0635783939001ND
2023-11-1635842434001ND
2023-11-1635842436001ND