Diquat
Grandwood Park Subdivision - Lake Co. Pw
NOTE: Grandwood Park Subdivision - Lake Co. Pw purchases water from Central Lake County Jawa which is required to test for diquat. Sample information shown below was taken by Central Lake County Jawa.
Diquat is a herbicide used on potato crops and aquatic weeds.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | ND | 1 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 7 | 0 | ND |
| 2019 | ND | 7 | 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
NOTE: Grandwood Park Subdivision - Lake Co. Pw purchases water from Central Lake County Jawa which is required to test for diquat. Sample information shown below was taken by Central Lake County Jawa.
| Date | Lab ID | Result |
|---|---|---|
| 2014-04-07 | 1404308-003A | ND |
| 2015-04-13 | 1504936-003A | ND |
| 2016-04-04 | 1604109-003A | ND |
| 2017-04-12 | 1704915-003A | ND |
| 2018-05-09 | 3932546 | ND |
| 2019-05-15 | 4295222 | ND |