Diquat
Sycamore
Diquat is a herbicide used on potato crops and aquatic weeds.
10
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
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 | N/A | 0 | 0 | N/A |
| 2017 | ND | 4 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2014-02-05 | SB40146-01_01 | ND |
| 2014-05-13 | SE40580-01_01 | ND |
| 2015-01-20 | SA50454-01_01 | ND |
| 2015-04-14 | SD50434-01_01 | ND |
| 2015-08-13 | SH50889-01_01 | ND |
| 2015-10-07 | SJ50343-01_01 | ND |
| 2017-01-10 | 17A0273-01_01 | ND |
| 2017-01-10 | 17A0272-01_01 | ND |
| 2017-05-02 | 17E0088-01_01 | ND |
| 2017-05-02 | 17E0087-01_01 | ND |