Diquat
Town of Hempstead Water Department
Diquat is a herbicide used on potato crops and aquatic weeds.
33
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 |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 12 | 0 | ND |
| 2017 | ND | 8 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 9 | 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 |
|---|---|---|
| 2015-01-22 | 1501D12-001-SOCS | ND |
| 2015-01-22 | 1501D12-002-SOCS | ND |
| 2016-01-22 | 1601F36-001-SOC | ND |
| 2016-04-20 | 1604I76-001-SOC | ND |
| 2016-04-20 | 1604I765-002-SOC | ND |
| 2016-08-23 | 1608M27-002-SOCS | ND |
| 2016-08-23 | 1608M270992 | ND |
| 2016-08-23 | 1608M27-004 | ND |
| 2016-08-23 | 1608M27-003 | ND |
| 2016-08-24 | 1609N61-003 | ND |
| 2016-08-24 | 160861-004 | ND |
| 2016-08-30 | 1608R85-002 | ND |
| 2016-08-30 | 1608R85-001 | ND |
| 2016-09-23 | 1608M27-001 | ND |
| 2017-09-22 | 7030806001-SOC | ND |
| 2017-09-22 | 7030806004-SOC | ND |
| 2017-10-05 | 7032089003-SOC | ND |
| 2017-10-05 | 7032089004-SOC | ND |
| 2017-10-19 | 7033560003-SOC | ND |
| 2017-10-19 | 7033560002-SOC | ND |
| 2017-10-19 | 7033560004-SOC | ND |
| 2017-10-19 | 7033560001-POC | ND |
| 2018-07-31 | 7059937002-SOC | ND |
| 2018-07-31 | 7059937001-SOC | ND |
| 2019-01-31 | 7078041005 | ND |
| 2019-03-29 | 7083937004 | ND |
| 2019-03-29 | 7083937002 | ND |
| 2019-03-29 | 7083937003 | ND |
| 2019-03-29 | 7083937001 | ND |
| 2019-04-15 | 7085833001 | ND |
| 2019-04-15 | 7085833002 | ND |
| 2019-05-02 | 7087918001 | ND |
| 2019-05-02 | 7087918002 | ND |