Diquat
Pike County Water Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
28
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 | N/A | 0 | 0 | N/A |
| 2016 | ND | 14 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 14 | 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 |
|---|---|---|
| 2016-03-01 | 112003012016-4S | ND |
| 2016-03-01 | 112003012016-5S | ND |
| 2016-03-01 | 112003012016-6S | ND |
| 2016-03-01 | 112003012016-3S | ND |
| 2016-03-01 | 112003012016-7S | ND |
| 2016-03-01 | 112003012016-2S | ND |
| 2016-03-01 | 112003012016-1S | ND |
| 2016-09-06 | 112009062016-5 | ND |
| 2016-09-06 | 112009062016-7 | ND |
| 2016-09-06 | 112009062016-4 | ND |
| 2016-09-06 | 112009062016-3 | ND |
| 2016-09-06 | 112009062016-6 | ND |
| 2016-09-06 | 112009062016-2 | ND |
| 2016-09-06 | 112009062016-1 | ND |
| 2019-04-16 | 189535-01SOC | ND |
| 2019-04-16 | 189537-01SOC | ND |
| 2019-04-16 | 189531-01SOC | ND |
| 2019-04-16 | 189532-01SOC | ND |
| 2019-04-16 | 189533-01SOC | ND |
| 2019-04-16 | 189536-01SOC | ND |
| 2019-04-16 | 189534-01SOC | ND |
| 2019-07-11 | 192954-01SOC | ND |
| 2019-07-11 | 192955-01SOC | ND |
| 2019-07-12 | 192956-01SOC | ND |
| 2019-07-12 | 192952-01SOC | ND |
| 2019-07-12 | 192953-01SOC | ND |
| 2019-07-12 | 192957-01SOC | ND |
| 2019-07-15 | 192951-01SOC | ND |