Diquat
Lockport
Diquat is a herbicide used on potato crops and aquatic weeds.
26
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 | 10 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 14 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2015-08-04 | 1508225-006A | ND |
| 2015-08-04 | 1508225-009A | ND |
| 2015-08-04 | 1508225-012A | ND |
| 2015-08-04 | 1508225-015A | ND |
| 2015-08-04 | 1508225-003A | ND |
| 2015-11-10 | 1511802-002A | ND |
| 2015-11-10 | 1511802-004A | ND |
| 2015-11-10 | 1511802-006A | ND |
| 2015-11-10 | 1511802-008A | ND |
| 2015-11-10 | 1511802-010A | ND |
| 2018-03-20 | 1803E24-003A | ND |
| 2018-05-29 | 1805L07-003A | ND |
| 2018-08-07 | 1808616-001E | ND |
| 2018-08-07 | 1808616-002E | ND |
| 2018-08-07 | 1808616-003E | ND |
| 2018-08-07 | 1808616-004E | ND |
| 2018-10-01 | 1810073-001C | ND |
| 2018-10-01 | 1810073-002C | ND |
| 2018-10-15 | 1810B48-001E | ND |
| 2018-10-15 | 1810B48-003E | ND |
| 2018-10-15 | 1810B48-005E | ND |
| 2018-10-16 | 1810C95-001E | ND |
| 2018-10-16 | 1810C95-003E | ND |
| 2018-10-17 | 1810D46-001E | ND |
| 2019-02-05 | 1902317-001E | ND |
| 2019-04-09 | 1904731-001E | ND |