Diquat
City of San Jose - EVG/EDV/COY
Diquat is a herbicide used on potato crops and aquatic weeds.
27
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 | 13 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 13 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 1 | 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 |
|---|---|---|
| 2014-02-18 | 9590-012-0902 | ND |
| 2014-02-25 | 9590-005-0948 | ND |
| 2014-02-25 | 9590-006-0859 | ND |
| 2014-03-27 | 1610-004-0900 | ND |
| 2014-03-27 | 1610-003-0810 | ND |
| 2014-03-27 | 1610-002-1000 | ND |
| 2014-03-27 | 1610-001-1130 | ND |
| 2014-04-15 | 3334-013-0845 | ND |
| 2014-04-15 | 3334-011-0930 | ND |
| 2014-08-05 | 5867-007-0920 | ND |
| 2014-08-26 | 5867-011-1125 | ND |
| 2014-08-26 | 5867-012-1008 | ND |
| 2014-08-26 | 5867-013-0918 | ND |
| 2017-01-17 | 1610-004-0925 | ND |
| 2017-01-17 | 1610-002-0835 | ND |
| 2017-01-17 | 1610-001-1036 | ND |
| 2017-03-14 | 1610-003-0746 | ND |
| 2017-04-11 | 1610-001-1125 | ND |
| 2017-04-11 | 1610-004-0850 | ND |
| 2017-04-11 | 1610-003-0755 | ND |
| 2017-04-11 | 1610-002-0950 | ND |
| 2017-05-02 | 1610-011-1002 | ND |
| 2017-08-01 | 5867-012-0950 | ND |
| 2017-08-01 | 5867-011-1030 | ND |
| 2017-09-26 | 5867-013-1030 | ND |
| 2017-12-19 | 5867-013-0920 | ND |
| 2019-05-14 | 1610-012-0949 | ND |