Diquat
Santa Clara Valley Water District
Diquat is a herbicide used on potato crops and aquatic weeds.
54
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 | 9 | 0 | ND |
| 2015 | ND | 21 | 0 | ND |
| 2016 | ND | 6 | 0 | ND |
| 2017 | ND | 6 | 0 | ND |
| 2018 | ND | 6 | 0 | ND |
| 2019 | ND | 6 | 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 |
|---|---|---|
| 2014-08-12 | 9590-011-0901 | ND |
| 2014-08-12 | 9590-007-1010 | ND |
| 2014-08-12 | 9590-005-1021 | ND |
| 2014-11-12 | 9590-024-1103 | ND |
| 2014-11-12 | 2400-024-1103 | ND |
| 2014-11-12 | 9590-023-0949 | ND |
| 2014-11-12 | 2400-023-0949 | ND |
| 2014-11-12 | 9590-022-1030 | ND |
| 2014-11-12 | 2400-022-1030 | ND |
| 2015-02-23 | 2400-022-1200 | ND |
| 2015-02-23 | 9590-022-1200 | ND |
| 2015-02-23 | 2400-023-1100 | ND |
| 2015-02-23 | 9590-023-1100 | ND |
| 2015-02-23 | 2400-024-1240 | ND |
| 2015-02-23 | 9590-024-1240 | ND |
| 2015-05-18 | 9590-023-0855 | ND |
| 2015-05-18 | 2400-023-0855 | ND |
| 2015-05-18 | 2400-024-0920 | ND |
| 2015-05-18 | 9590-022-0950 | ND |
| 2015-05-18 | 2400-022-0950 | ND |
| 2015-05-18 | 9590-024-0920 | ND |
| 2015-05-19 | 9590-005-0935 | ND |
| 2015-05-19 | 2400-005-0935 | ND |
| 2015-05-19 | 9590-007-0928 | ND |
| 2015-05-19 | 2400-007-0928 | ND |
| 2015-05-19 | 2400-011-0818 | ND |
| 2015-05-19 | 9590-011-0818 | ND |
| 2015-08-18 | 9590-022-1030 | ND |
| 2015-09-21 | 9590-023-1105 | ND |
| 2015-09-21 | 9590-024-1110 | ND |
| 2016-02-23 | 2400-011-0800 | ND |
| 2016-02-23 | 9590-011-0950 | ND |
| 2016-02-23 | 2400-005-0930 | ND |
| 2016-02-23 | 9590-005-0823 | ND |
| 2016-02-23 | 9590-007-0932 | ND |
| 2016-02-23 | 2400-007-0932 | ND |
| 2017-05-16 | 9590-007-0950 | ND |
| 2017-05-16 | 9590-011-0845 | ND |
| 2017-08-22 | 9590-005-0800 | ND |
| 2017-11-08 | 9590-023-1015 | ND |
| 2017-11-08 | 9590-022-1023 | ND |
| 2017-11-15 | 9590-024-1340 | ND |
| 2018-08-21 | 9590-007-1152 | ND |
| 2018-08-21 | 9590-005-1323 | ND |
| 2018-08-21 | 9590-011-1006 | ND |
| 2018-08-22 | 9590-024-1017 | ND |
| 2018-08-22 | 9590-023-1448 | ND |
| 2018-08-22 | 9590-022-1055 | ND |
| 2019-05-21 | 9590-011-0851 | ND |
| 2019-05-21 | 9590-007-1049 | ND |
| 2019-05-21 | 9590-005-1056 | ND |
| 2019-05-22 | 9590-024-1205 | ND |
| 2019-05-22 | 9590-023-1057 | ND |
| 2019-05-22 | 9590-022-1249 | ND |