Diquat
Alco Water Service
Diquat is a herbicide used on potato crops and aquatic weeds.
25
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 | ND | 2 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 7 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | ND | 9 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-11-18 | 2706-022-0830 | ND |
| 2014-11-18 | 2706-011-0905 | ND |
| 2015-03-10 | 2706-011-1120 | ND |
| 2015-03-10 | 2706-021-1215 | ND |
| 2015-06-18 | 2706-021-1200 | ND |
| 2015-07-01 | 2706-004-1215 | ND |
| 2016-01-19 | 2706-004-0920 | ND |
| 2016-01-19 | 2706-007-1020 | ND |
| 2016-01-19 | 2706-001-0950 | ND |
| 2016-03-30 | 2706-001-0825 | ND |
| 2016-03-30 | 2706-022-0855 | ND |
| 2016-03-30 | 2706-007-0840 | ND |
| 2016-06-27 | 2706-022-1135 | ND |
| 2017-12-05 | 5810-011-0941 | ND |
| 2018-03-06 | 5810-011-1009 | ND |
| 2018-03-06 | 5810-021-0946 | ND |
| 2018-06-05 | 5810-021-0716 | ND |
| 2018-09-10 | 5810-007-0909 | ND |
| 2018-09-10 | 5810-001-0930 | ND |
| 2018-09-10 | 5810-004-0830 | ND |
| 2018-12-26 | 5810-007-0814 | ND |
| 2018-12-26 | 5810-001-0835 | ND |
| 2018-12-26 | 5810-004-0826 | ND |
| 2019-03-05 | 5810-022-0925 | ND |
| 2019-06-05 | 5810-022-0928 | ND |