Diquat
City of San Luis
Diquat is a herbicide used on potato crops and aquatic weeds.
28
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 | 4 | 0 | ND |
| 2015 | ND | 12 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 6 | 0 | ND |
| 2019 | ND | 6 | 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 | 479281-005D | ND |
| 2014-02-13 | 479281-005C | ND |
| 2014-02-13 | 479281-005B | ND |
| 2014-02-13 | 479281-005A | ND |
| 2015-05-20 | 201505210191SC | ND |
| 2015-05-20 | 201505210191SB | ND |
| 2015-05-20 | 201505210191SA | ND |
| 2015-05-20 | 201505210177SC | ND |
| 2015-05-20 | 201505210177SB | ND |
| 2015-05-20 | 201505210177SA | ND |
| 2015-11-18 | 201511190130SC | ND |
| 2015-11-18 | 201511190132SC | ND |
| 2015-11-18 | 201511190132SB | ND |
| 2015-11-18 | 201511190132SA | ND |
| 2015-11-18 | 201511190130SB | ND |
| 2015-11-18 | 201511190130SA | ND |
| 2018-03-27 | 201803280607SC | ND |
| 2018-03-27 | 201803280607SB | ND |
| 2018-03-27 | 201803280607SA | ND |
| 2018-03-28 | 201803280608SC | ND |
| 2018-03-28 | 201803280608SB | ND |
| 2018-03-28 | 201803280608SA | ND |
| 2019-03-12 | 201903130096SA | ND |
| 2019-03-12 | 201903130098SC | ND |
| 2019-03-12 | 201903130098SB | ND |
| 2019-03-12 | 201903130098SA | ND |
| 2019-03-12 | 201903130096SC | ND |
| 2019-03-12 | 201903130096SB | ND |