Diquat
Portales Water System
Diquat is a herbicide used on potato crops and aquatic weeds.
11
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 |
|---|---|---|---|---|
| 2012 | ND | 2 | 0 | ND |
| 2013 | ND | 2 | 0 | ND |
| 2014 | ND | 3 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 4 | 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 |
|---|---|---|
| 2012-09-11 | 2012032647 | ND |
| 2012-10-30 | 2012038994 | ND |
| 2013-09-05 | 1309246-005A | ND |
| 2013-10-02 | 1310236-002A | ND |
| 2014-07-17 | 1407893-005A | ND |
| 2014-07-17 | 1407894-005A | ND |
| 2014-10-01 | 1410173-001A | ND |
| 2017-06-06 | 2017016942 | ND |
| 2017-06-06 | 2017016943 | ND |
| 2017-10-17 | 2017030180 | ND |
| 2017-10-17 | 2017030181 | ND |