Diquat
Port Washington WD
Diquat is a herbicide used on potato crops and aquatic weeds.
29
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 | 7 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-04-07 | 1404529-002-SOCS | ND |
| 2014-05-05 | 1405251-001-SOCS | ND |
| 2014-06-02 | 1406109-001-SOCS | ND |
| 2014-07-07 | 1407372-002-SOCS | ND |
| 2014-07-07 | 1407372-005-SOCS | ND |
| 2014-07-14 | 1407945-005-SOCS | ND |
| 2014-08-04 | 1408146-001-SOCS | ND |
| 2014-09-08 | 1409535-001-SOCS | ND |
| 2014-10-06 | 1410357-001-SOCS | ND |
| 2015-04-13 | 1504911-003-SOCS | ND |
| 2015-05-04 | 1505212-001-SOCS | ND |
| 2015-06-01 | 1506099-001-SOCS | ND |
| 2015-07-06 | 1507268-005-SOCS | ND |
| 2015-07-06 | 1507268-002-SOCS | ND |
| 2015-08-03 | 1508069-001-SOCS | ND |
| 2015-09-08 | 1509487-001-SOCS | ND |
| 2016-07-05 | 1607195-001-SOCS | ND |
| 2016-08-08 | 1608841-002-SOCS | ND |
| 2016-08-08 | 1608841-001-SOCS | ND |
| 2016-08-15 | 1608E02-001-SOCS | ND |
| 2017-07-03 | 7023331001-SOCS | ND |
| 2017-08-07 | 7026412001-SOCS | ND |
| 2017-08-07 | 7026412003-SOCS | ND |
| 2017-08-07 | 7026412002-SOCS | ND |
| 2018-07-10 | 7057573001 | ND |
| 2019-07-15 | 7097515003 | ND |
| 2019-08-12 | 70100932002 | ND |
| 2019-08-20 | 7010205002 | ND |
| 2019-08-20 | 70102058001 | ND |