Diquat
San Lorenzo Valley Water District
Diquat is a herbicide used on potato crops and aquatic weeds.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | ND | 2 | 0 | ND |
2015 | ND | 8 | 0 | ND |
2016 | N/A | 0 | 0 | N/A |
2017 | N/A | 0 | 0 | N/A |
2018 | ND | 11 | 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 |
---|---|---|
2014-08-27 | 9590-034-1140 | ND |
2014-11-18 | 9590-034-1200 | ND |
2015-02-10 | 9590-034-1130 | ND |
2015-05-20 | 9590-034-1445 | ND |
2015-06-17 | 9590-023-1230 | ND |
2015-06-17 | 9590-024-1215 | ND |
2015-06-23 | 9590-010-1430 | ND |
2015-06-23 | 9590-026-1515 | ND |
2015-06-30 | 9590-025-1400 | ND |
2015-07-27 | 9590-022-1500 | ND |
2018-02-12 | 9590-034-0900 | ND |
2018-03-01 | 9590-025-0945 | ND |
2018-03-01 | 9590-026-0910 | ND |
2018-03-06 | 9590-024-1045 | ND |
2018-04-17 | 9590-022-1400 | ND |
2018-05-07 | 9590-034-0900 | ND |
2018-06-12 | 9590-025-1015 | ND |
2018-06-12 | 9590-026-0945 | ND |
2018-06-12 | 9590-010-1659 | ND |
2018-07-17 | 9590-022-1400 | ND |
2018-09-04 | 9590-010-0900 | ND |