Diquat
Valencia Water Company Town Division
Diquat is a herbicide used on potato crops and aquatic weeds.
12
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 | ND | 6 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2015-01-13 | 550-38319-1S | ND |
| 2015-01-13 | 550-38319-2S | ND |
| 2015-01-13 | 550-38319-3S | ND |
| 2015-01-13 | 550-38319-4S | ND |
| 2015-10-27 | 518184-001 | ND |
| 2015-10-27 | 518185-001 | ND |
| 2018-02-28 | 577634-001 | ND |
| 2018-03-14 | 579056-001 | ND |
| 2018-04-05 | 581510-001 | ND |
| 2019-03-14 | 19C1489-01 | ND |
| 2019-06-05 | 19F0451-01 | ND |
| 2019-06-06 | 19F0664-01 | ND |