Diquat
Golden State Water Company - Cordova
Diquat is a herbicide used on potato crops and aquatic weeds.
17
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 | 7 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 7 | 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 |
|---|---|---|
| 2014-03-04 | 2706-051-1121 | ND |
| 2014-06-03 | 2706-051-1224 | ND |
| 2015-07-14 | 2706-028-0959 | ND |
| 2015-07-14 | 2706-030-1116 | ND |
| 2015-07-14 | 2706-008-1250 | ND |
| 2015-07-14 | 2706-019-1147 | ND |
| 2015-07-14 | 2706-010-1340 | ND |
| 2015-07-21 | 2706-051-1130 | ND |
| 2015-07-28 | 2706-022-1216 | ND |
| 2016-09-20 | 2706-029-1300 | ND |
| 2018-08-21 | 9590-022-1135 | ND |
| 2018-08-22 | 9590-028-0959 | ND |
| 2018-08-22 | 9590-010-1228 | ND |
| 2018-08-22 | 9590-030-0902 | ND |
| 2018-08-29 | 9590-019-1020 | ND |
| 2018-08-29 | 9590-051-1233 | ND |
| 2018-08-29 | 9590-008-1055 | ND |