Diquat
Pointe A La Hache Water System
Diquat is a herbicide used on potato crops and aquatic weeds.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | ND | 2 | 0 | ND |
2015 | ND | 4 | 0 | ND |
2016 | ND | 2 | 0 | ND |
2017 | ND | 2 | 0 | ND |
2018 | ND | 4 | 0 | ND |
2019 | ND | 4 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
---|---|---|
2014-01-21 | AD88467 | ND |
2014-01-21 | AD88467 | ND |
2015-03-30 | 35181567004 | ND |
2015-03-30 | 35181567004 | ND |
2015-10-06 | 35211176006 | ND |
2015-10-06 | 35211176006 | ND |
2016-12-08 | 35282294004 | ND |
2016-12-08 | 35282294004 | ND |
2017-02-16 | 35296025004 | ND |
2017-02-16 | 35296025004 | ND |
2018-03-06 | 35378294001 | ND |
2018-03-06 | 35378294001 | ND |
2018-09-24 | 35419981001 | ND |
2018-09-24 | 35419981001 | ND |
2019-02-14 | 35448746001 | ND |
2019-02-14 | 35448746001 | ND |
2019-09-24 | 35500297001 | ND |
2019-09-24 | 35500297001 | ND |