Diquat
City of Hermiston
Diquat is a herbicide used on potato crops and aquatic weeds.
16
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 | ND | 8 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 8 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2015-08-10 | 150813003010-S | ND |
| 2015-08-10 | 150813003011-S | ND |
| 2015-08-10 | 150813003012-S | ND |
| 2015-08-10 | 150813003009-S | ND |
| 2015-10-15 | 151016016003-S | ND |
| 2015-10-15 | 151016016004-S | ND |
| 2015-10-15 | 151016016005-S | ND |
| 2015-10-15 | 151016016006-S | ND |
| 2017-04-10 | 170410C2-S | ND |
| 2017-04-10 | 170410C3-S | ND |
| 2017-04-10 | 170410C4-S | ND |
| 2017-04-10 | 170410C1-S | ND |
| 2017-07-13 | 170713F1-S | ND |
| 2017-07-13 | 170713F2-S | ND |
| 2017-07-13 | 170713F3-S | ND |
| 2017-07-13 | 170713F4-S | ND |