Know Your Environment. Protect Your Health.

Diquat

Lafourche Water District 1

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

 

31

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND80ND
2019ND80ND
2020ND40ND
2021ND40ND
2022ND30ND
2023ND40ND

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
2018-01-2535370415009ND
2018-01-2535370415009ND
2018-05-1435392324001ND
2018-05-1435392324002ND
2018-05-1435392324002ND
2018-05-1435392324001ND
2018-07-2335406305001ND
2018-07-2335406305001ND
2019-01-2935445082001ND
2019-01-2935445082001ND
2019-02-1835449374001ND
2019-02-1835449374001ND
2019-07-2435484855001ND
2019-07-2435484855001ND
2019-08-2835494052001ND
2019-08-2835494052001ND
2020-01-2235526013001ND
2020-01-2235526013002ND
2020-10-1535585520001ND
2020-12-0335596468001ND
2021-03-1135619276001ND
2021-03-1135619285001ND
2021-11-0435675774001ND
2021-12-1635685695001ND
2022-03-0235701429001ND
2022-08-2535742731001ND
2022-10-1235753130001ND
2023-02-2735782418001ND
2023-03-2735789305001ND
2023-10-2335836721001ND
2023-12-1435848533001ND