Diquat
Lower Rio Grande Public Water Works Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
15
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 | 8 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 7 | 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 |
|---|---|---|
| 2014-02-25 | 1402B03-004A | ND |
| 2014-02-25 | 1402B04-005A | ND |
| 2014-02-25 | 1402A91-005A | ND |
| 2014-02-25 | 1402A95-005A | ND |
| 2014-02-25 | 1402A93-005A | ND |
| 2014-02-25 | 1402A94-005A | ND |
| 2014-02-25 | 1402A96-005A | ND |
| 2014-03-25 | 1403B77-001A | ND |
| 2017-09-13 | 1709759-005 | ND |
| 2017-09-13 | 1709758-005 | ND |
| 2017-09-13 | 1709757-005 | ND |
| 2017-09-13 | 1709756-005 | ND |
| 2017-09-13 | 1709777-005 | ND |
| 2017-09-13 | 1709755-005 | ND |
| 2017-09-13 | 1709754-005 | ND |