Diquat
City of San Diego
Diquat is a herbicide used on potato crops and aquatic weeds.
64
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 | 11 | 0 | ND |
| 2015 | ND | 12 | 0 | ND |
| 2016 | ND | 9 | 0 | ND |
| 2017 | ND | 9 | 0 | ND |
| 2018 | ND | 11 | 0 | ND |
| 2019 | ND | 12 | 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 |
|---|---|---|
| 2014-02-19 | 9437-010-0000 | ND |
| 2014-02-19 | 9437-006-0000 | ND |
| 2014-02-19 | 9437-001-0000 | ND |
| 2014-05-21 | 9437-010-0000 | ND |
| 2014-05-21 | 9437-006-0000 | ND |
| 2014-05-21 | 9437-001-0000 | ND |
| 2014-09-22 | 9437-010-0000 | ND |
| 2014-09-22 | 9437-006-0000 | ND |
| 2014-09-22 | 9437-001-0000 | ND |
| 2014-12-01 | 9437-010-0000 | ND |
| 2014-12-01 | 9437-001-0000 | ND |
| 2015-02-18 | 9437-010-0000 | ND |
| 2015-02-18 | 9437-001-0000 | ND |
| 2015-02-18 | 9437-006-0000 | ND |
| 2015-05-20 | 9437-001-0000 | ND |
| 2015-05-20 | 9437-010-0000 | ND |
| 2015-05-20 | 9437-006-0000 | ND |
| 2015-08-19 | 9437-006-0000 | ND |
| 2015-08-19 | 9437-010-0000 | ND |
| 2015-08-19 | 9437-001-0000 | ND |
| 2015-11-18 | 9437-006-0000 | ND |
| 2015-11-18 | 9437-010-0000 | ND |
| 2015-11-18 | 9437-001-0000 | ND |
| 2016-05-18 | 9437-006-0000 | ND |
| 2016-05-18 | 9437-001-0000 | ND |
| 2016-05-18 | 9437-010-0000 | ND |
| 2016-08-17 | 9437-001-0000 | ND |
| 2016-08-17 | 9437-010-0000 | ND |
| 2016-08-17 | 9437-006-0000 | ND |
| 2016-11-16 | 9437-010-0000 | ND |
| 2016-11-16 | 9437-001-0000 | ND |
| 2016-11-16 | 9437-006-0000 | ND |
| 2017-02-15 | 9437-001-0000 | ND |
| 2017-02-15 | 9437-010-0000 | ND |
| 2017-02-15 | 9437-006-0000 | ND |
| 2017-09-27 | 9437-006-0000 | ND |
| 2017-09-27 | 9437-001-0000 | ND |
| 2017-09-27 | 9437-010-0000 | ND |
| 2017-11-15 | 9437-006-0000 | ND |
| 2017-11-15 | 9437-001-0000 | ND |
| 2017-11-15 | 9437-010-0000 | ND |
| 2018-02-07 | 9437-030-0000 | ND |
| 2018-02-21 | 9437-006-0000 | ND |
| 2018-02-21 | 9437-001-0000 | ND |
| 2018-02-21 | 9437-010-0000 | ND |
| 2018-06-13 | 9437-030-0000 | ND |
| 2018-08-15 | 9437-010-0000 | ND |
| 2018-08-15 | 9437-006-0000 | ND |
| 2018-08-15 | 9437-001-0000 | ND |
| 2018-08-15 | 9437-030-0000 | ND |
| 2018-09-05 | 9437-030-0000 | ND |
| 2018-11-14 | 9437-030-0000 | ND |
| 2019-03-06 | 9437-010-0000 | ND |
| 2019-03-06 | 9437-001-0000 | ND |
| 2019-03-19 | 9437-006-0000 | ND |
| 2019-06-05 | 9437-001-0000 | ND |
| 2019-06-05 | 9437-010-0000 | ND |
| 2019-06-05 | 9437-006-0000 | ND |
| 2019-09-04 | 9437-010-0000 | ND |
| 2019-09-04 | 9437-001-0000 | ND |
| 2019-09-04 | 9437-006-0000 | ND |
| 2019-12-04 | 9437-001-0000 | ND |
| 2019-12-04 | 9437-010-0000 | ND |
| 2019-12-04 | 9437-006-0000 | ND |