Diquat
Sands Point
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 |
|---|---|---|---|---|
| 2014 | ND | 5 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | ND | 8 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 8 | 0 | ND |
| 2019 | ND | 10 | 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 |
|---|---|---|
| 2014-03-11 | 1403744-001-SOCS | ND |
| 2014-03-11 | 1403744-002-SOCS | ND |
| 2014-03-11 | 1403744-004-SOCS | ND |
| 2014-03-11 | 1403744-003-SOCS | ND |
| 2014-03-13 | 1403952-001-SOCS | ND |
| 2015-11-17 | 1511D88-003-SOCS | ND |
| 2015-11-17 | 1511D88-004-SOCS | ND |
| 2015-11-17 | 1511D88-002-SOCS | ND |
| 2015-11-17 | 1511D88-001-SOCS | ND |
| 2015-12-14 | 1512B49-001A-SOC | ND |
| 2016-09-15 | 1609D59-001 | ND |
| 2016-11-16 | 704941001 | ND |
| 2016-12-01 | 705824001A | ND |
| 2016-12-01 | 705824001 | ND |
| 2016-12-01 | 705824004 | ND |
| 2016-12-01 | 705824003 | ND |
| 2016-12-01 | 705824005 | ND |
| 2016-12-01 | 705824002 | ND |
| 2017-03-21 | 7013841001 | ND |
| 2017-05-18 | 7019049001-SOCS | ND |
| 2018-10-23 | 7068805004-SOCS | ND |
| 2018-10-23 | 7068805002-SOCS | ND |
| 2018-10-23 | 7068805001-POCS | ND |
| 2018-10-23 | 7068805006-SOCS | ND |
| 2018-10-23 | 7068805003-SOCS | ND |
| 2018-10-23 | 7068805005-SOCS | ND |
| 2018-11-28 | 7072272001-SOCS | ND |
| 2018-11-28 | 7072266001-SOCS | ND |
| 2019-11-12 | 70111549004 | ND |
| 2019-11-12 | 70111549005 | ND |
| 2019-11-12 | 70111549001 | ND |
| 2019-11-12 | 70111549006 | ND |
| 2019-11-12 | 70111549002 | ND |
| 2019-11-12 | 70111549003 | ND |
| 2019-12-03 | 70113918002 | ND |
| 2019-12-03 | 70113918001 | ND |
| 2019-12-03 | 70113918003 | ND |
| 2019-12-03 | 70113918004 | ND |