Diquat
Richland Township Water Authority
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 | 5 | 0 | ND |
2015 | ND | 4 | 0 | ND |
2016 | ND | 1 | 0 | ND |
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 |
---|---|---|
2014-06-25 | 14030479-01 | ND |
2014-06-25 | 14030483-01 | ND |
2014-08-12 | 14030485-01 | ND |
2014-08-12 | 14030484-01 | ND |
2014-09-25 | 14091904-01 | ND |
2015-02-10 | 12392496 | ND |
2015-06-09 | 12872132 | ND |
2015-09-15 | 13254701 | ND |
2015-12-08 | 13624240 | ND |
2016-02-16 | 13861537 | ND |
2017-06-13 | 16246508 | ND |
2017-06-13 | 16246537 | ND |
2017-06-13 | 16246567 | ND |
2017-08-18 | 16716230 | ND |
2017-08-18 | 16716256 | ND |
2017-08-18 | 16716283 | ND |