Diquat
City of Galt
Diquat is a herbicide used on potato crops and aquatic weeds.
16
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 | 8 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 6 | 0 | ND |
| 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 |
|---|---|---|
| 2015-10-21 | 9590-021-0745 | ND |
| 2015-10-21 | 9590-022-0900 | ND |
| 2015-10-21 | 9590-025-1000 | ND |
| 2015-10-27 | 9590-016-1015 | ND |
| 2015-10-28 | 9590-019-1000 | ND |
| 2015-10-28 | 9590-020-1010 | ND |
| 2015-10-28 | 9590-024-0900 | ND |
| 2015-11-05 | 9590-021-1000 | ND |
| 2016-04-28 | 9590-017-1034 | ND |
| 2016-05-05 | 9590-027-1030 | ND |
| 2018-06-20 | 9590-020-1031 | ND |
| 2018-06-20 | 9590-023-0800 | ND |
| 2018-06-26 | 9590-021-0900 | ND |
| 2018-06-26 | 9590-027-0705 | ND |
| 2018-07-12 | 9590-021-0840 | ND |
| 2018-07-17 | 9590-030-0940 | ND |