Diquat
Quint-mar Water Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
24
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 | N/A | 0 | 0 | N/A |
| 2016 | ND | 10 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 10 | 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 |
|---|---|---|
| 2014-02-13 | AA88468 | ND |
| 2014-07-29 | AA90730 | ND |
| 2016-06-14 | AB12485 | ND |
| 2016-06-14 | AB12483 | ND |
| 2016-06-14 | AB12484 | ND |
| 2016-06-14 | AB12481 | ND |
| 2016-06-14 | AB12482 | ND |
| 2016-07-20 | AB13718 | ND |
| 2016-07-20 | AB13720 | ND |
| 2016-07-20 | AB13719 | ND |
| 2016-07-20 | AB13722 | ND |
| 2016-07-20 | AB13721 | ND |
| 2017-01-26 | AB17479 | ND |
| 2017-07-13 | AB21022 | ND |
| 2019-02-05 | AB32811 | ND |
| 2019-02-05 | AB32809 | ND |
| 2019-02-05 | AB32810 | ND |
| 2019-02-05 | AB32808 | ND |
| 2019-04-17 | AB34287 | ND |
| 2019-07-17 | AB36910 | ND |
| 2019-07-17 | AB36909 | ND |
| 2019-07-17 | AB36908-1 | ND |
| 2019-07-17 | AB36912 | ND |
| 2019-07-17 | AB36911 | ND |