Diquat
Breezy Hill WD
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 | 3 | 0 | ND |
2015 | ND | 13 | 0 | ND |
2016 | ND | 1 | 0 | ND |
2017 | ND | 1 | 0 | ND |
2018 | ND | 13 | 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 |
---|---|---|
2014-01-08 | AD34134 | ND |
2014-04-08 | AD38188 | ND |
2014-08-13 | AD43964 | ND |
2015-02-11 | AD51431 | ND |
2015-02-11 | AD51435 | ND |
2015-02-11 | AD51437 | ND |
2015-04-08 | AD53943 | ND |
2015-04-08 | AD53949 | ND |
2015-04-08 | AD53951 | ND |
2015-04-08 | AD53966 | ND |
2015-04-08 | AD53971 | ND |
2015-07-15 | AD58288 | ND |
2015-07-15 | AD58291 | ND |
2015-07-15 | AD58294 | ND |
2015-07-15 | AD58300 | ND |
2015-07-15 | AD58302 | ND |
2016-02-03 | AD70130 | ND |
2017-03-08 | AD90840 | ND |
2018-02-28 | AE08403 | ND |
2018-02-28 | AE08397 | ND |
2018-02-28 | AE08415 | ND |
2018-02-28 | AE08417 | ND |
2018-02-28 | AE08431 | ND |
2018-02-28 | AE08439 | ND |
2018-02-28 | AE08441 | ND |
2018-03-06 | AE08892 | ND |
2018-03-06 | AE08894 | ND |
2018-03-06 | AE08912 | ND |
2018-03-06 | AE08896 | ND |
2018-03-06 | AE08908 | ND |
2018-03-06 | AE08910 | ND |
2019-01-09 | AE23798 | ND |