Diquat
Oyster Bay Water District
Diquat is a herbicide used on potato crops and aquatic weeds.
20
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 |
|---|---|---|---|---|
| 2012 | ND | 5 | 0 | ND |
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 5 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | 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 |
|---|---|---|
| 2012-12-19 | 1212988-001-SOCS | ND |
| 2012-12-19 | 1212988-002-SOCS | ND |
| 2012-12-19 | 1212988-004-SOCS | ND |
| 2012-12-19 | 1212988-003-SOCS | ND |
| 2012-12-21 | 1212B33-001-SOCS | ND |
| 2014-06-04 | 1406268-004-SOCS | ND |
| 2014-06-04 | 1406268-005-SOCS | ND |
| 2014-06-04 | 1406268-002-SOCS | ND |
| 2014-06-04 | 1406268-001-SOCS | ND |
| 2014-06-04 | 1406268-003-SOCS | ND |
| 2015-05-20 | 1505E61-003-SOCS | ND |
| 2015-05-20 | 1505E61-001-SOCS | ND |
| 2015-05-20 | 1505E61-002-SOCS | ND |
| 2015-05-20 | 1505E61-004-SOCS | ND |
| 2015-05-20 | 1505E61-005-SOCS | ND |
| 2016-06-28 | 1606Q85-003-SOCS | ND |
| 2016-06-28 | 1606Q85-004-SOCS | ND |
| 2016-06-28 | 1606Q85-001-SOCS | ND |
| 2016-06-28 | 1606Q85-002-SOCS | ND |
| 2016-06-29 | 1606S10-001-SOCS | ND |