Diquat
Carmichael Water District
Diquat is a herbicide used on potato crops and aquatic weeds.
14
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 | 6 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 6 | 0 | ND |
| 2018 | ND | 2 | 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 |
|---|---|---|
| 2014-06-11 | 5810-016-0918 | ND |
| 2014-12-17 | 5810-006-1022 | ND |
| 2014-12-17 | 5810-009-0947 | ND |
| 2014-12-17 | 5810-021-1103 | ND |
| 2014-12-17 | 5810-022-0852 | ND |
| 2014-12-17 | 5810-023-0913 | ND |
| 2017-03-21 | 5810-022-1100 | ND |
| 2017-03-21 | 5810-023-1040 | ND |
| 2017-06-01 | 5810-006-1051 | ND |
| 2017-06-01 | 5810-009-1015 | ND |
| 2017-06-01 | 5810-016-1220 | ND |
| 2017-06-01 | 5810-021-0947 | ND |
| 2018-03-15 | 9590-022-1323 | ND |
| 2018-03-15 | 9590-023-1349 | ND |