Diquat
Hempstead
Diquat is a herbicide used on potato crops and aquatic weeds.
32
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 9 | 0 | ND |
| 2015 | ND | 8 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 8 | 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 |
|---|---|---|
| 2014-02-07 | 1402307-001-SOCS | ND |
| 2014-03-18 | 1403C79-001-SOCS | ND |
| 2014-03-18 | 1403C79-004-SOCS | ND |
| 2014-03-18 | 1403C79-002-SOCS | ND |
| 2014-03-18 | 1403C79-003-SOCS | ND |
| 2014-03-26 | 1403I18-002-SOCS | ND |
| 2014-03-26 | 03I18-001-SOCS | ND |
| 2014-05-13 | 1405924-001-SOCS | ND |
| 2014-05-13 | 1405924-002-SOCS | ND |
| 2015-03-17 | 1503B84-003-SOCS | ND |
| 2015-03-17 | 1503B84-001-SOCS | ND |
| 2015-03-17 | 1503B84-002-SOCS | ND |
| 2015-03-24 | 1503G73-001-SOCS | ND |
| 2015-05-27 | 1505J25-004-SOCS | ND |
| 2015-05-27 | 1505J25-001-SOCS | ND |
| 2015-05-27 | 1505J25-003-SOCS | ND |
| 2015-05-27 | 1505J25-002-SOCS | ND |
| 2016-03-23 | 1603I98-003-SOCS | ND |
| 2016-03-23 | 1603I98-001-SOCS | ND |
| 2016-03-23 | 1603I98-002-SOCS | ND |
| 2016-03-29 | 1603N30-002-SOCS | ND |
| 2016-03-29 | 1603N30-001-SOCS | ND |
| 2017-05-23 | 7019310002 | ND |
| 2017-05-23 | 7019310001 | ND |
| 2018-11-07 | 7070357002 | ND |
| 2018-11-07 | 7070357001 | ND |
| 2018-11-14 | 7071096001 | ND |
| 2018-11-14 | 7071096002 | ND |
| 2018-11-21 | 7071825001 | ND |
| 2018-11-21 | 7071825002 | ND |
| 2018-12-11 | 7073530002 | ND |
| 2018-12-11 | 7073530001 | ND |