Diquat
South Mesa Water Company
Diquat is a herbicide used on potato crops and aquatic weeds.
8
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | ND | 1 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 7 | 0 | ND |
2018 | N/A | 0 | 0 | N/A |
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 |
---|---|---|
2014-11-04 | 9588-022-0850 | ND |
2017-08-07 | 3761-003-0845 | ND |
2017-08-07 | 3761-004-0910 | ND |
2017-08-07 | 3761-006-0925 | ND |
2017-08-07 | 3761-008-0955 | ND |
2017-08-07 | 3761-009-1010 | ND |
2017-08-07 | 3761-010-1050 | ND |
2017-08-07 | 3761-013-0945 | ND |