Diquat
Soquel Creek Water District
Diquat is a herbicide used on potato crops and aquatic weeds.
45
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 | 25 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 15 | 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 |
|---|---|---|
| 2014-01-09 | 1644-049-0930 | ND |
| 2014-09-22 | 1644-003-1040 | ND |
| 2014-09-22 | 1644-004-0950 | ND |
| 2014-09-22 | 1644-005-1015 | ND |
| 2014-09-22 | 1644-036-1340 | ND |
| 2014-09-23 | 1644-049-0935 | ND |
| 2014-09-23 | 1644-002-1455 | ND |
| 2014-09-23 | 1644-007-1305 | ND |
| 2014-09-23 | 1644-022-1335 | ND |
| 2014-09-23 | 1644-034-1440 | ND |
| 2014-09-24 | 1644-037-1145 | ND |
| 2014-09-24 | 1644-047-1335 | ND |
| 2014-09-25 | 1644-012-1050 | ND |
| 2014-12-15 | 1644-022-1458 | ND |
| 2014-12-15 | 1644-037-1122 | ND |
| 2014-12-15 | 1644-047-1443 | ND |
| 2014-12-18 | 1644-034-0845 | ND |
| 2014-12-18 | 1644-007-0918 | ND |
| 2014-12-18 | 1644-002-0903 | ND |
| 2014-12-19 | 1644-004-1440 | ND |
| 2014-12-19 | 1644-003-1118 | ND |
| 2014-12-19 | 1644-049-0933 | ND |
| 2014-12-22 | 1644-036-1255 | ND |
| 2014-12-23 | 1644-005-1200 | ND |
| 2014-12-23 | 1644-012-1505 | ND |
| 2015-02-12 | 5806-054-0911 | ND |
| 2015-04-07 | 5806-014-1505 | ND |
| 2015-06-18 | 5806-054-1315 | ND |
| 2015-08-27 | 5806-054-1125 | ND |
| 2017-05-16 | 9590-013-1425 | ND |
| 2017-08-22 | 9590-004-1050 | ND |
| 2017-09-13 | 9590-036-1407 | ND |
| 2017-09-13 | 9590-005-1234 | ND |
| 2017-09-19 | 9590-049-1109 | ND |
| 2017-10-03 | 9590-054-1340 | ND |
| 2017-10-04 | 9590-037-1155 | ND |
| 2017-10-04 | 9590-054-1155 | ND |
| 2017-10-05 | 9590-034-1207 | ND |
| 2017-10-05 | 9590-047-1102 | ND |
| 2017-10-10 | 9590-022-1311 | ND |
| 2017-10-12 | 9590-014-1335 | ND |
| 2017-10-12 | 9590-012-0733 | ND |
| 2017-10-24 | 9590-013-1106 | ND |
| 2017-10-24 | 9590-007-1033 | ND |
| 2019-12-30 | 5810-059-1137 | ND |