Diquat
Centennial Park Domestic Water Improvement District
Diquat is a herbicide used on potato crops and aquatic weeds.
20
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 | N/A | 0 | 0 | N/A |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 16 | 0 | ND |
| 2018 | ND | 3 | 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 |
|---|---|---|
| 2016-08-29 | 201608300195S | ND |
| 2017-02-21 | 201702220068CS | ND |
| 2017-02-21 | 201702220068BS | ND |
| 2017-02-21 | 201702220068AS | ND |
| 2017-03-13 | 201703140304S | ND |
| 2017-05-30 | 201705310067DS | ND |
| 2017-05-30 | 201705310067CS | ND |
| 2017-05-30 | 201705310067BS | ND |
| 2017-05-30 | 201705310067AS | ND |
| 2017-08-23 | 201708240184DS | ND |
| 2017-08-23 | 201708240184CS | ND |
| 2017-08-23 | 201708240184BS | ND |
| 2017-08-23 | 201708240184AS | ND |
| 2017-10-23 | 201710240250SD | ND |
| 2017-10-23 | 201710240250SC | ND |
| 2017-10-23 | 201710240250SB | ND |
| 2017-10-23 | 201710240250SA | ND |
| 2018-05-30 | 201805310333SC | ND |
| 2018-05-30 | 201805310333SB | ND |
| 2018-09-11 | 201809120466SB | ND |