Diquat
Waialee-sunset Beach
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 | 7 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | ND | 1 | 0 | ND |
2017 | ND | 5 | 0 | ND |
2018 | ND | 2 | 0 | ND |
2019 | ND | 1 | 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 |
---|---|---|
2014-02-19 | 201402210361 | ND |
2014-02-20 | 201402220088 | ND |
2014-07-21 | 201407230664 | ND |
2014-07-21 | 201407230666 | ND |
2014-10-31 | 201411040537 | ND |
2014-10-31 | 201411040538 | ND |
2014-11-12 | 201411140850 | ND |
2016-07-05 | ND | |
2017-01-04 | ND | |
2017-02-23 | ND | |
2017-10-10 | ND | |
2017-10-31 | ND | |
2017-10-31 | ND | |
2018-04-25 | 201804300496 | ND |
2018-08-13 | 201808160452 | ND |
2019-02-19 | 201902210382 | ND |