Diquat
City of San Jacinto
Diquat is a herbicide used on potato crops and aquatic weeds.
16
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 | N/A | 0 | 0 | N/A |
| 2016 | ND | 12 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2016-01-20 | 3334-014-0847 | ND |
| 2016-01-27 | 3334-005-0840 | ND |
| 2016-01-27 | 3334-005-0950 | ND |
| 2016-01-27 | 3334-014-0825 | ND |
| 2016-02-10 | 3334-001-1020 | ND |
| 2016-02-16 | 3334-010-1450 | ND |
| 2016-02-23 | 3334-001-1430 | ND |
| 2016-03-02 | 3334-010-1420 | ND |
| 2016-04-05 | 3334-010-1535 | ND |
| 2016-04-12 | 3334-001-1504 | ND |
| 2016-04-19 | 3334-005-1400 | ND |
| 2016-06-28 | 3334-014-0800 | ND |
| 2019-03-20 | 3334-010-0701 | ND |
| 2019-03-27 | 3334-014-0701 | ND |
| 2019-12-10 | 3334-010-1330 | ND |
| 2019-12-11 | 3334-005-0900 | ND |