Diquat
Antioch
Diquat is a herbicide used on potato crops and aquatic weeds.
28
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 14 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 14 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2014-02-24 | 4023381-01 | ND |
| 2014-02-24 | 4023381-02 | ND |
| 2014-02-24 | 4023403-01 | ND |
| 2014-02-24 | 4023401-01 | ND |
| 2014-02-24 | 4023403-02 | ND |
| 2014-02-24 | 4023407-01 | ND |
| 2014-02-24 | 4023407-02 | ND |
| 2014-04-14 | 4042940-01 | ND |
| 2014-04-14 | 4042945-03 | ND |
| 2014-04-14 | 4042945-02 | ND |
| 2014-04-14 | 4042945-01 | ND |
| 2014-04-14 | 4042940-04 | ND |
| 2014-04-14 | 4042940-03 | ND |
| 2014-04-14 | 4042940-02 | ND |
| 2017-01-25 | 7013676-01 | ND |
| 2017-01-25 | 7013671-06 | ND |
| 2017-01-25 | 7013671-03 | ND |
| 2017-01-25 | 7013671-01 | ND |
| 2017-01-25 | 7013706-04 | ND |
| 2017-01-25 | 7013706-01 | ND |
| 2017-01-25 | 7013676-03 | ND |
| 2017-04-11 | 7042294-02 | ND |
| 2017-04-11 | 7042294-03 | ND |
| 2017-04-11 | 7042294-04 | ND |
| 2017-04-11 | 7042294-01 | ND |
| 2017-04-12 | 7042250-01 | ND |
| 2017-04-12 | 7042250-03 | ND |
| 2017-05-01 | 7050160-04 | ND |