Diquat
Schriever Water Treatment Service Area
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 2 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 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 |
|---|---|---|
| 2014-02-24 | AD89296 | ND |
| 2014-02-24 | AD89296 | ND |
| 2015-04-13 | 35183676002 | ND |
| 2015-04-13 | 35183676002 | ND |
| 2015-09-24 | 35208879010 | ND |
| 2015-09-24 | 35208879010 | ND |
| 2016-03-01 | 35232149002 | ND |
| 2016-03-01 | 35232149002 | ND |
| 2016-11-14 | 35277515003 | ND |
| 2016-11-14 | 35277515003 | ND |
| 2017-02-14 | 35295627003 | ND |
| 2017-02-14 | 35295627003 | ND |
| 2017-11-01 | 35345511001 | ND |
| 2017-11-01 | 35345511001 | ND |
| 2018-08-28 | 35414104001 | ND |
| 2018-08-28 | 35414104001 | ND |
| 2019-02-18 | 35449369001 | ND |
| 2019-02-18 | 35449369001 | ND |
| 2019-08-28 | 35494055001 | ND |
| 2019-08-28 | 35494055001 | ND |