Diquat
Monterey Park Water Department
Diquat is a herbicide used on potato crops and aquatic weeds.
14
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 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 14 | 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 |
|---|---|---|
| 2019-02-28 | 9588-001-1130 | ND |
| 2019-02-28 | 9588-002-1115 | ND |
| 2019-02-28 | 9588-006-1240 | ND |
| 2019-02-28 | 9588-010-1220 | ND |
| 2019-02-28 | 9588-011-1145 | ND |
| 2019-02-28 | 9588-038-1205 | ND |
| 2019-05-20 | 9588-001-0850 | ND |
| 2019-05-20 | 9588-002-0905 | ND |
| 2019-05-20 | 9588-006-0940 | ND |
| 2019-05-20 | 9588-010-1035 | ND |
| 2019-05-20 | 9588-011-0920 | ND |
| 2019-05-20 | 9588-013-0945 | ND |
| 2019-05-20 | 9588-038-1020 | ND |
| 2019-08-27 | 9588-013-0935 | ND |