Diquat
City of Nogales
Diquat is a herbicide used on potato crops and aquatic weeds.
25
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 | 2 | 0 | ND |
| 2015 | ND | 10 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 10 | 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 |
|---|---|---|
| 2014-03-27 | 2998974 | ND |
| 2014-09-30 | 3114791 | ND |
| 2015-06-24 | 3269843 | ND |
| 2015-06-24 | 3269829 | ND |
| 2015-06-24 | 3269822 | ND |
| 2015-06-24 | 3269815 | ND |
| 2015-06-24 | 326936 | ND |
| 2015-12-08 | 3371695 | ND |
| 2015-12-08 | 3371689 | ND |
| 2015-12-08 | 3371680 | ND |
| 2015-12-08 | 3371657 | ND |
| 2015-12-08 | 3371642 | ND |
| 2016-09-29 | 3555619 | ND |
| 2017-03-15 | 3655652 | ND |
| 2017-08-15 | 3761090 | ND |
| 2018-03-05 | 3886306 | ND |
| 2018-04-26 | 3921892 | ND |
| 2018-04-26 | 3921884 | ND |
| 2018-05-08 | 3933073 | ND |
| 2018-05-08 | 3933044 | ND |
| 2018-05-16 | 3939487 | ND |
| 2018-08-14 | 4024606 | ND |
| 2018-12-31 | 1812-152-01 | ND |
| 2018-12-31 | 1812-154-01 | ND |
| 2018-12-31 | 1812-153-01 | ND |