Diquat
Peter Pitchess Honor Rancho Detention Center
Diquat is a herbicide used on potato crops and aquatic weeds.
14
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 6 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 1 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2015-02-18 | 5442-003-1155 | ND |
| 2015-02-18 | 5442-006-1215 | ND |
| 2015-02-18 | 5442-016-1230 | ND |
| 2015-05-05 | 5442-003-1250 | ND |
| 2015-05-05 | 5442-006-1310 | ND |
| 2015-05-05 | 5442-016-1330 | ND |
| 2017-09-18 | 9590-016-0945 | ND |
| 2018-07-16 | 9590-003-0800 | ND |
| 2018-07-16 | 9590-006-0845 | ND |
| 2018-10-09 | 9590-003-0900 | ND |
| 2018-10-09 | 9590-006-0930 | ND |
| 2019-07-08 | 9590-016-0945 | ND |
| 2019-09-03 | 9590-006-0930 | ND |
| 2019-12-16 | 9590-016-0830 | ND |