Diquat
City of Florence
Diquat is a herbicide used on potato crops and aquatic weeds.
25
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 | 2 | 0 | ND |
| 2015 | ND | 9 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 7 | 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 |
|---|---|---|
| 2014-05-27 | AD40319 | ND |
| 2014-05-27 | AD40317 | ND |
| 2015-03-17 | AD53072 | ND |
| 2015-03-18 | AD53103 | ND |
| 2015-03-18 | AD53105 | ND |
| 2015-03-18 | AD53107 | ND |
| 2015-03-18 | AD53109 | ND |
| 2015-03-18 | AD53112 | ND |
| 2015-03-18 | AD53114 | ND |
| 2015-03-18 | AD53116 | ND |
| 2015-03-18 | AD53118 | ND |
| 2016-03-29 | AD73324 | ND |
| 2017-02-01 | AD89158 | ND |
| 2017-02-01 | AD89168 | ND |
| 2018-01-30 | AE06813 | ND |
| 2018-01-30 | AE06829 | ND |
| 2018-01-30 | AE06838 | ND |
| 2018-01-30 | AE06840 | ND |
| 2018-01-30 | AE06842 | ND |
| 2018-10-23 | AE20328 | ND |
| 2018-10-23 | AE20304 | ND |
| 2019-01-15 | AE24119 | ND |
| 2019-04-04 | AE28248 | ND |
| 2019-04-04 | AE28249 | ND |
| 2019-10-03 | AE38224 | ND |