Diquat
Cucamonga Valley Water District
Diquat is a herbicide used on potato crops and aquatic weeds.
19
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 9 | 0 | ND |
| 2015 | ND | 6 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 1 | 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 |
|---|---|---|
| 2014-02-27 | 9588-033-1255 | ND |
| 2014-05-29 | 9588-033-0000 | ND |
| 2014-06-05 | 9588-027-1045 | ND |
| 2014-08-05 | 9588-055-1150 | ND |
| 2014-08-18 | 9588-033-1050 | ND |
| 2014-09-04 | 9588-033-1010 | ND |
| 2014-09-04 | 9588-027-1010 | ND |
| 2014-11-20 | 9588-033-1145 | ND |
| 2014-12-09 | 9588-027-1040 | ND |
| 2015-03-05 | 9588-027-0855 | ND |
| 2015-03-12 | 9588-055-1140 | ND |
| 2015-05-13 | 9588-055-1050 | ND |
| 2015-07-09 | 9588-017-1100 | ND |
| 2015-08-20 | 9588-055-0925 | ND |
| 2015-11-23 | 3761-055-0900 | ND |
| 2016-02-11 | 3761-055-1040 | ND |
| 2016-11-23 | 3761-035-1440 | ND |
| 2017-06-02 | 3761-027-0918 | ND |
| 2019-07-24 | 9588-017-1115 | ND |