Diquat
Western MWD (Arlington)
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 | N/A | 0 | 0 | N/A |
2015 | ND | 3 | 0 | ND |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 3 | 0 | ND |
2018 | ND | 5 | 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 |
---|---|---|
2015-01-07 | 3334-001-1030 | ND |
2015-01-07 | 3334-005-1100 | ND |
2015-02-18 | 3334-009-1400 | ND |
2017-12-27 | 3334-002-1500 | ND |
2017-12-27 | 3334-003-1510 | ND |
2017-12-27 | 3334-004-1520 | ND |
2018-02-26 | 3334-001-1340 | ND |
2018-02-26 | 3334-002-1405 | ND |
2018-02-26 | 3334-003-1430 | ND |
2018-02-26 | 3334-004-1445 | ND |
2018-02-26 | 3334-005-1515 | ND |