Diquat
Coastside County 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 |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | ND | 2 | 0 | ND |
2015 | ND | 4 | 0 | ND |
2016 | ND | 2 | 0 | ND |
2017 | ND | 2 | 0 | ND |
2018 | ND | 2 | 0 | ND |
2019 | ND | 3 | 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 |
---|---|---|
2014-03-17 | 5810-011-1040 | ND |
2014-03-19 | 5810-010-1130 | ND |
2015-03-04 | 5810-010-1015 | ND |
2015-03-10 | 5810-011-1030 | ND |
2015-03-25 | 5810-002-1015 | ND |
2015-12-16 | 5810-013-1200 | ND |
2016-02-02 | 5810-011-1020 | ND |
2016-03-30 | 5810-010-0950 | ND |
2017-02-14 | 5810-011-1030 | ND |
2017-03-15 | 5810-010-1115 | ND |
2018-02-20 | 5810-011-1425 | ND |
2018-03-14 | 5810-010-1110 | ND |
2019-02-19 | 5810-011-1025 | ND |
2019-03-13 | 5810-010-1135 | ND |
2019-04-17 | 5810-002-1010 | ND |