Diquat
Lake Hemet Municipal Water District
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 | ND | 3 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | ND | 1 | 0 | ND |
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 |
---|---|---|
2014-06-25 | 3334-050-1100 | ND |
2014-10-07 | 3334-050-1115 | ND |
2014-12-15 | 3334-050-1015 | ND |
2016-11-09 | 3761-050-0830 | ND |
2017-02-21 | 3761-050-0945 | ND |
2017-05-22 | 3761-050-0930 | ND |
2017-08-21 | 3761-050-1120 | ND |
2018-02-14 | 3761-028-0905 | ND |
2018-02-14 | 3761-030-0945 | ND |
2018-02-14 | 3761-036-1040 | ND |
2018-02-21 | 3761-018-0910 | ND |
2018-02-21 | 3761-019-0840 | ND |