Diquat
City of Pineville Water System
Diquat is a herbicide used on potato crops and aquatic weeds.
44
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 | 20 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | 0.0744 ppb | 18 | 2 | ND - 0.670 ppb |
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 |
|---|---|---|
| 2014-03-10 | AD89665 | ND |
| 2014-03-10 | AD89665 | ND |
| 2016-09-15 | 35265896005 | ND |
| 2016-09-15 | 35265896005 | ND |
| 2016-09-28 | 35268029012 | ND |
| 2016-09-28 | 35268029009 | ND |
| 2016-09-28 | 35268029010 | ND |
| 2016-09-28 | 35268029011 | ND |
| 2016-09-28 | 35268029012 | ND |
| 2016-09-28 | 35268029013 | ND |
| 2016-09-28 | 35268029011 | ND |
| 2016-09-28 | 35268029010 | ND |
| 2016-09-28 | 35268029009 | ND |
| 2016-09-28 | 35268029013 | ND |
| 2016-11-16 | 35278842009 | ND |
| 2016-11-16 | 35278842008 | ND |
| 2016-11-16 | 35278842008 | ND |
| 2016-11-16 | 35278842007 | ND |
| 2016-11-16 | 35278842006 | ND |
| 2016-11-16 | 35278842009 | ND |
| 2016-11-16 | 35278842007 | ND |
| 2016-11-16 | 35278842006 | ND |
| 2017-09-27 | 35338974002 | ND |
| 2017-09-27 | 35338974002 | ND |
| 2017-09-27 | 35338974001 | ND |
| 2017-09-27 | 35338974001 | ND |
| 2019-07-18 | 35483366003 | ND |
| 2019-07-18 | 35483366005 | ND |
| 2019-07-18 | 35483366004 | ND |
| 2019-07-18 | 35483366002 | ND |
| 2019-07-18 | 35483366001 | ND |
| 2019-07-18 | 35483366001 | ND |
| 2019-07-18 | 35483366002 | ND |
| 2019-07-18 | 35483366003 | ND |
| 2019-07-18 | 35483366004 | ND |
| 2019-07-18 | 35483366005 | ND |
| 2019-07-25 | 35485313001 | 0.670 ppb |
| 2019-07-25 | 35485313004 | ND |
| 2019-07-25 | 35485313003 | ND |
| 2019-07-25 | 35485313002 | ND |
| 2019-07-25 | 35485313001 | 0.670 ppb |
| 2019-07-25 | 35485313004 | ND |
| 2019-07-25 | 35485313003 | ND |
| 2019-07-25 | 35485313002 | ND |