Diquat
Bethpage WD
Diquat is a herbicide used on potato crops and aquatic weeds.
38
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 12 | 0 | ND |
| 2016 | ND | 9 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 9 | 0 | ND |
| 2019 | ND | 8 | 0 | ND |
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 |
|---|---|---|
| 2015-03-23 | 1503F55-001 | ND |
| 2015-04-09 | 1504634-001 | ND |
| 2015-06-08 | 1506620-002 | ND |
| 2015-06-08 | 1506620-001 | ND |
| 2015-06-09 | 1506727-001 | ND |
| 2015-06-09 | 1506768-001 | ND |
| 2015-06-09 | 156727-002 | ND |
| 2015-06-09 | 1506768-002 | ND |
| 2015-06-10 | 1506874-001 | ND |
| 2015-06-10 | 1506849-001 | ND |
| 2015-07-01 | 1507016-001 | ND |
| 2015-10-02 | 1510136-001 | ND |
| 2016-04-01 | 1604038-001 | ND |
| 2016-04-01 | 1604038-002 | ND |
| 2016-06-09 | 1606933-002 | ND |
| 2016-06-09 | 1606993-001 | ND |
| 2016-06-09 | 1606933-003 | ND |
| 2016-06-10 | 1606A06-001 | ND |
| 2016-06-10 | 1606A06-002 | ND |
| 2016-06-10 | 1606A77-001 | ND |
| 2016-06-10 | 1606A77-002 | ND |
| 2018-02-06 | 7042094006 | ND |
| 2018-02-06 | 7042094007 | ND |
| 2018-02-06 | 7042094009 | ND |
| 2018-02-06 | 7042094003 | ND |
| 2018-02-06 | 7042094005 | ND |
| 2018-02-06 | 7042094002 | ND |
| 2018-02-06 | 7042094008 | ND |
| 2018-02-06 | 7042094001 | ND |
| 2018-02-06 | 7042094004 | ND |
| 2019-09-16 | 70105002001 | ND |
| 2019-09-16 | 70105002007 | ND |
| 2019-09-16 | 70105002002 | ND |
| 2019-09-16 | 70105002005 | ND |
| 2019-09-16 | 70105002003 | ND |
| 2019-09-16 | 70105002004 | ND |
| 2019-09-16 | 70105002006 | ND |
| 2019-09-20 | 70105818001 | ND |