Diquat
North Wales Water Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
40
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 | 20 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 20 | 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 |
|---|---|---|
| 2014-04-07 | 14030700-01 | ND |
| 2014-04-07 | 14030711-01 | ND |
| 2014-04-07 | 14030702-01 | ND |
| 2014-04-07 | 14030710-01 | ND |
| 2014-04-07 | 14030703-01 | ND |
| 2014-04-07 | 14030704-01 | ND |
| 2014-04-07 | 14030709-01 | ND |
| 2014-04-07 | 14030706-01 | ND |
| 2014-04-07 | 14030708-01 | ND |
| 2014-04-07 | 14030707-01 | ND |
| 2014-07-14 | 14071693-001 | ND |
| 2014-07-14 | 14071691-001 | ND |
| 2014-07-14 | 14071713-001 | ND |
| 2014-07-14 | 14071690-001 | ND |
| 2014-07-14 | 14071706-001 | ND |
| 2014-07-28 | 14073270-001 | ND |
| 2014-08-11 | 14081086-001 | ND |
| 2014-08-18 | 14081989-001 | ND |
| 2014-08-18 | 14081991-001 | ND |
| 2014-08-18 | 14081990-001 | ND |
| 2017-04-04 | 15939271 | ND |
| 2017-04-10 | 15939830 | ND |
| 2017-04-10 | 15939859 | ND |
| 2017-04-10 | 15939974 | ND |
| 2017-04-10 | 15939741 | ND |
| 2017-04-10 | 15939771 | ND |
| 2017-04-10 | 15939801 | ND |
| 2017-04-10 | 15939887 | ND |
| 2017-04-10 | 15939945 | ND |
| 2017-04-10 | 15939916 | ND |
| 2017-07-06 | 16415620 | ND |
| 2017-07-24 | 16567957 | ND |
| 2017-07-24 | 16568179 | ND |
| 2017-07-24 | 16567813 | ND |
| 2017-07-24 | 16567729 | ND |
| 2017-07-24 | 16567673 | ND |
| 2017-07-26 | 16567785 | ND |
| 2017-07-26 | 16567757 | ND |
| 2017-07-26 | 16567929 | ND |
| 2017-07-26 | 16567701 | ND |