Diquat
Cary
Diquat is a herbicide used on potato crops and aquatic weeds.
32
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 14 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 16 | 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 |
|---|---|---|
| 2015-09-01 | 5090819-01 | ND |
| 2015-09-01 | 5090819-02 | ND |
| 2015-09-01 | 5090817-04 | ND |
| 2015-09-01 | 5090819-03 | ND |
| 2015-09-01 | 5090817-03 | ND |
| 2015-09-01 | 5090819-04 | ND |
| 2015-09-01 | 5090817-01 | ND |
| 2015-09-01 | 5090817-02 | ND |
| 2015-11-19 | 5113106-01 | ND |
| 2015-11-19 | 5113102-02 | ND |
| 2015-11-19 | 5113111-02 | ND |
| 2015-11-19 | 5113111-01 | ND |
| 2015-11-19 | 5113106-02 | ND |
| 2015-11-23 | 5113717-02 | ND |
| 2016-01-06 | 6011004-02 | ND |
| 2016-01-07 | 6011004-01 | ND |
| 2018-07-17 | 8073094-04 | ND |
| 2018-07-17 | 8073094-03 | ND |
| 2018-07-17 | 8073094-02 | ND |
| 2018-07-17 | 8073094-01 | ND |
| 2018-09-12 | 8091983-01 | ND |
| 2018-09-12 | 8091983-02 | ND |
| 2018-09-12 | 8091983-03 | ND |
| 2018-09-12 | 8091983-04 | ND |
| 2018-11-07 | 8111244-01 | ND |
| 2018-11-07 | 8111244-02 | ND |
| 2018-11-07 | 8111244-03 | ND |
| 2018-11-07 | 8111244-04 | ND |
| 2018-12-05 | 8120953-04 | ND |
| 2018-12-05 | 8120953-03 | ND |
| 2018-12-05 | 8120953-02 | ND |
| 2018-12-05 | 8120953-01 | ND |