Diquat
Franklin Square WD
Diquat is a herbicide used on potato crops and aquatic weeds.
19
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 | 4 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 6 | 0 | ND |
| 2018 | ND | 4 | 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 |
|---|---|---|
| 2014-04-01 | 1404080-001-SOCS | ND |
| 2014-04-01 | 1404080-002-SOCS | ND |
| 2014-04-08 | 1404651-002-SOCS | ND |
| 2014-04-15 | 1404B70-001-SOCS | ND |
| 2015-08-04 | 1508266-002-SOCS | ND |
| 2015-08-11 | 1508871-001-SOCS | ND |
| 2015-08-11 | 1508266-001-SOCS | ND |
| 2015-08-11 | 1508871-002-SOCS | ND |
| 2015-08-25 | 1508J38-001-SOCS | ND |
| 2017-04-04 | 7014998001-SOCS | ND |
| 2017-04-04 | 701499801-SOCS | ND |
| 2017-04-04 | 701-4998002-SOC | ND |
| 2017-04-11 | 7015529002 | ND |
| 2017-04-11 | 7015529001 | ND |
| 2017-04-18 | 7016178001 | ND |
| 2018-12-04 | 7072994002 | ND |
| 2018-12-04 | 7072994003 | ND |
| 2018-12-04 | 7072994001 | ND |
| 2018-12-04 | 7072994004 | ND |