Diquat
East Chicago Water Works
Diquat is a herbicide used on potato crops and aquatic weeds.
12
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 | 3 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2014-07-17 | 321512RS28-1403 | ND |
| 2014-10-15 | 327441RS28-1404 | ND |
| 2015-02-09 | 333828RS28-1501 | ND |
| 2015-07-09 | 343721RS28-1503 | ND |
| 2015-07-09 | 343723RS28-1503 | ND |
| 2016-04-13 | 338132RS28-1502 | ND |
| 2017-05-17 | 388935RS28-1702 | ND |
| 2017-08-08 | 394966RS28-1703 | ND |
| 2017-11-16 | 403036RS28-1704 | ND |
| 2018-05-16 | 416733RS28-1802 | ND |
| 2018-08-21 | 426834RS-1803 | ND |
| 2018-11-16 | 436282RS28-1804 | ND |