Diquat
Norwich Public Utilities
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 | 6 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 6 | 0 | ND |
2018 | N/A | 0 | 0 | N/A |
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 |
---|---|---|
2014-05-01 | 6300206SOC5 | ND |
2014-05-01 | 6300207SOC5 | ND |
2014-05-01 | 6300208SOC5 | ND |
2014-09-10 | 6300380SOC5 | ND |
2014-09-10 | 6300381SOC5 | ND |
2014-09-10 | 6300382SOC5 | ND |
2017-05-04 | PH-0453-6303174S | ND |
2017-05-04 | PH-0453-6303175S | ND |
2017-05-04 | PH-0453-6303176S | ND |
2017-07-06 | PH-0453-6303367S | ND |
2017-07-06 | PH-0453-6303368S | ND |
2017-07-06 | PH-0453-6303369S | ND |