Diquat
Carmel Water Department
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 | 8 | 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 |
---|---|---|
2014-02-10 | 2014020479RS28-1 | ND |
2014-05-15 | 2014051070RS28-1 | ND |
2015-05-14 | 2015051024RS28-1 | ND |
2015-05-14 | 2015051021RS28-1 | ND |
2015-05-14 | 2015051022RS28-1 | ND |
2015-05-14 | 2015051023RS28-1 | ND |
2015-08-13 | 2015082057RS28-1 | ND |
2015-08-13 | 2015082059RS28-1 | ND |
2015-08-13 | 2015082058RS28-1 | ND |
2015-08-13 | 2015082055RS28-1 | ND |
2018-05-15 | 2018052237RS28-1 | ND |
2018-05-15 | 2018052238RS28-1 | ND |
2018-05-15 | 2018052239RS28-1 | ND |
2018-05-15 | 2018052240RS28-1 | ND |
2018-08-13 | 2018082800RS28-1 | ND |
2018-08-13 | 2018082804RS28-1 | ND |
2018-08-13 | 2018082805RS28-1 | ND |
2018-08-13 | 2018082809RS28-1 | ND |