Diquat
City of Gilroy
Diquat is a herbicide used on potato crops and aquatic weeds.
36
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 18 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 18 | 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 |
|---|---|---|
| 2015-05-20 | 5810-008-1025 | ND |
| 2015-05-20 | 5810-009-1100 | ND |
| 2015-05-20 | 5810-007-1300 | ND |
| 2015-05-20 | 5810-010-0810 | ND |
| 2015-05-20 | 5810-006-0945 | ND |
| 2015-05-21 | 5810-001-0800 | ND |
| 2015-05-21 | 5810-002-1010 | ND |
| 2015-05-21 | 5810-011-0955 | ND |
| 2015-05-21 | 5810-004-1250 | ND |
| 2015-08-19 | 5810-008-1019 | ND |
| 2015-08-19 | 5810-007-1120 | ND |
| 2015-08-19 | 5810-009-1044 | ND |
| 2015-08-19 | 5810-006-0948 | ND |
| 2015-08-19 | 5810-010-1203 | ND |
| 2015-08-19 | 5810-004-1320 | ND |
| 2015-08-19 | 5810-002-1250 | ND |
| 2015-08-19 | 5810-001-1225 | ND |
| 2015-08-20 | 5810-011-0845 | ND |
| 2018-05-03 | 1610-009-0815 | ND |
| 2018-05-03 | 1610-010-1000 | ND |
| 2018-05-03 | 1610-011-0930 | ND |
| 2018-05-03 | 1610-007-1030 | ND |
| 2018-05-03 | 1610-008-0755 | ND |
| 2018-05-03 | 1610-006-1106 | ND |
| 2018-05-03 | 1610-004-0835 | ND |
| 2018-05-03 | 1610-001-0905 | ND |
| 2018-05-24 | 1610-002-0805 | ND |
| 2018-08-13 | 1610-008-0955 | ND |
| 2018-08-13 | 1610-007-0940 | ND |
| 2018-08-13 | 1610-006-1030 | ND |
| 2018-08-13 | 1610-009-1010 | ND |
| 2018-08-13 | 1610-004-0830 | ND |
| 2018-08-13 | 1610-002-0815 | ND |
| 2018-08-13 | 1610-010-0925 | ND |
| 2018-08-13 | 1610-001-0800 | ND |
| 2018-08-13 | 1610-011-0740 | ND |