Diquat
Camino Real Regional Utility Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
12
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 | 5 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 5 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-02-18 | 1402866-005A | ND |
| 2014-02-18 | 1402871-005A | ND |
| 2014-02-18 | 1402874-005A | ND |
| 2014-02-18 | 1402869-005A | ND |
| 2014-05-21 | 1405A43-005A | ND |
| 2017-02-08 | 1702464-005 | ND |
| 2017-02-08 | 1702462-005 | ND |
| 2017-02-08 | 1702467-005 | ND |
| 2017-03-01 | 1703086-005 | ND |
| 2017-04-19 | 1704A06-003 | ND |
| 2019-11-19 | 1911973-002 | ND |
| 2019-11-19 | 1911976-002 | ND |