Diquat
Cerritos - City, 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 |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | N/A | 0 | 0 | N/A |
2015 | ND | 5 | 0 | ND |
2016 | ND | 1 | 0 | ND |
2017 | N/A | 0 | 0 | N/A |
2018 | ND | 6 | 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 |
---|---|---|
2015-02-12 | 2706-001-1200 | ND |
2015-02-12 | 2706-003-1250 | ND |
2015-05-28 | 2706-001-0855 | ND |
2015-05-28 | 2706-003-0910 | ND |
2015-06-30 | 2706-002-1400 | ND |
2016-05-25 | 9588-002-1340 | ND |
2018-02-22 | 9588-001-1110 | ND |
2018-02-22 | 9588-002-1210 | ND |
2018-02-22 | 9588-003-1130 | ND |
2018-05-24 | 9588-001-1130 | ND |
2018-05-24 | 9588-002-1215 | ND |
2018-05-24 | 9588-003-1150 | ND |