Diquat
City of Mountain View
Diquat is a herbicide used on potato crops and aquatic weeds.
11
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 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 5 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 2 | 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 |
|---|---|---|
| 2016-02-24 | 1610-011-0915 | ND |
| 2016-02-24 | 1610-016-1010 | ND |
| 2016-02-24 | 1610-029-1110 | ND |
| 2016-05-12 | 1610-011-0915 | ND |
| 2016-05-12 | 1610-016-1000 | ND |
| 2018-03-01 | 9590-029-0840 | ND |
| 2018-12-06 | 9590-014-1200 | ND |
| 2019-02-14 | 1610-011-1050 | ND |
| 2019-02-14 | 1610-016-1120 | ND |
| 2019-03-28 | 1610-011-0900 | ND |
| 2019-03-28 | 1610-016-0820 | ND |