Diquat
La Habra Heights County 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 | N/A | 0 | 0 | N/A |
2015 | ND | 6 | 0 | ND |
2016 | ND | 2 | 0 | ND |
2017 | N/A | 0 | 0 | N/A |
2018 | ND | 6 | 0 | ND |
2019 | ND | 2 | 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
Date | Lab ID | Result |
---|---|---|
2015-04-10 | 9588-009-0909 | ND |
2015-04-10 | 9588-010-0920 | ND |
2015-07-28 | 9588-009-0935 | ND |
2015-07-28 | 9588-010-1057 | ND |
2015-09-16 | 9588-006-1010 | ND |
2015-12-16 | 9588-006-0955 | ND |
2016-03-21 | 9588-005-0920 | ND |
2016-06-03 | 9588-005-1005 | ND |
2018-04-10 | 9588-009-0942 | ND |
2018-04-10 | 9588-010-0935 | ND |
2018-07-20 | 9588-006-1014 | ND |
2018-07-20 | 9588-009-0930 | ND |
2018-07-20 | 9588-010-0947 | ND |
2018-10-19 | 9588-006-1040 | ND |
2019-02-21 | 9588-005-0900 | ND |
2019-05-29 | 9588-005-0830 | ND |