Diquat
Oxford Water Works & Sewer Board
Diquat is a herbicide used on potato crops and aquatic weeds.
24
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 | ND | 10 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 10 | 0 | ND |
| 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 |
|---|---|---|
| 2014-02-17 | 140217043-1 | ND |
| 2014-08-19 | 140819039-1 | ND |
| 2015-02-19 | 150220001-5 | ND |
| 2015-02-19 | 150220001-3 | ND |
| 2015-02-19 | 150220001-4 | ND |
| 2015-02-19 | 150220001-1 | ND |
| 2015-02-19 | 150220001-2 | ND |
| 2015-10-26 | 151026047-4 | ND |
| 2015-10-26 | 151026047-5 | ND |
| 2015-10-26 | 151026047-1 | ND |
| 2015-10-26 | 151026047-2 | ND |
| 2015-10-26 | 151026047-3 | ND |
| 2017-02-22 | 170222051-1 | ND |
| 2017-10-27 | 171027019-1 | ND |
| 2018-02-22 | 180222023-1 | ND |
| 2018-02-22 | 180222023-2 | ND |
| 2018-02-22 | 180222023-3 | ND |
| 2018-02-22 | 180222023-4 | ND |
| 2018-02-22 | 180222023-5 | ND |
| 2018-05-22 | 180522024-1 | ND |
| 2018-07-31 | 180731026-001 | ND |
| 2018-10-11 | 18100409-003H | ND |
| 2018-10-11 | 18100409-002H | ND |
| 2018-10-11 | 18100409-001H | ND |