Diquat
Artesia Municipal Water System
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 8 | 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 |
|---|---|---|
| 2014-01-22 | 1401A15-004A | ND |
| 2014-01-22 | 1401A17-004A | ND |
| 2014-01-22 | 1401A16-004A | ND |
| 2014-01-22 | 1401A27-005A | ND |
| 2014-01-22 | 1401A18-004A | ND |
| 2014-01-22 | 1401A19-004A | ND |
| 2014-05-20 | 1405962-001A | ND |
| 2014-05-20 | 1405964-005A | ND |
| 2017-08-22 | 2017024651 | ND |
| 2017-08-22 | 2017024649 | ND |
| 2017-08-22 | 2017024653 | ND |
| 2017-08-22 | 2017024652 | ND |
| 2017-08-22 | 2017024654 | ND |
| 2017-08-22 | 2017024650 | ND |
| 2018-04-30 | 1804E59-004 | ND |
| 2018-07-30 | 2018021507 | ND |