Diquat
Golden State Water Company - Arden Water Services
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 | 5 | 0 | ND |
2016 | N/A | 0 | 0 | N/A |
2017 | N/A | 0 | 0 | N/A |
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 |
---|---|---|
2015-07-14 | 2706-001-1150 | ND |
2015-07-14 | 2706-002-1250 | ND |
2015-07-14 | 2706-008-1043 | ND |
2015-07-21 | 2706-005-1230 | ND |
2015-12-08 | 2706-006-1031 | ND |
2018-08-29 | 9590-001-1435 | ND |
2018-08-29 | 9590-002-1500 | ND |
2018-08-29 | 9590-005-1348 | ND |
2018-08-29 | 9590-006-1358 | ND |
2018-08-29 | 9590-008-1317 | ND |