Diquat
Daleville Water & Sewer Board
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 | ND | 2 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 6 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 6 | 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 |
|---|---|---|
| 2014-07-21 | 140722025-1 | ND |
| 2014-10-09 | 141010012-1 | ND |
| 2016-03-29 | 160330019-1 | ND |
| 2016-03-29 | 160330019-2 | ND |
| 2016-03-29 | 160330019-3 | ND |
| 2016-10-06 | 161007022-1 | ND |
| 2016-10-06 | 161007022-3 | ND |
| 2016-10-06 | 161007022-2 | ND |
| 2017-07-19 | 170720035-1 | ND |
| 2017-10-05 | 171006061-1 | ND |
| 2019-09-13 | 20121716003_ISOC | ND |
| 2019-09-13 | 20121716002_ISOC | ND |
| 2019-09-13 | 20121716001_ISOC | ND |
| 2019-10-29 | 20128177002_ISOC | ND |
| 2019-10-29 | 20128177001_ISOC | ND |
| 2019-10-29 | 20128177003_ISOC | ND |