Diquat
Coachella Water Authority
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 | N/A | 0 | 0 | N/A |
| 2016 | ND | 6 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 6 | 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 |
|---|---|---|
| 2016-04-26 | 3334-009-0754 | ND |
| 2016-04-26 | 3334-010-0700 | ND |
| 2016-04-26 | 3334-012-0909 | ND |
| 2016-04-27 | 3334-018-0800 | ND |
| 2016-04-27 | 3334-019-0720 | ND |
| 2016-04-27 | 3334-020-0830 | ND |
| 2019-04-22 | 3334-009-1125 | ND |
| 2019-04-22 | 3334-010-1040 | ND |
| 2019-04-22 | 3334-012-1010 | ND |
| 2019-04-22 | 3334-018-1145 | ND |
| 2019-04-22 | 3334-019-1320 | ND |
| 2019-04-22 | 3334-020-1130 | ND |