Diquat
Altoona Water Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
24
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 12 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 12 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2014-06-09 | 14061228-01 | ND |
| 2014-06-10 | 14061236-01 | ND |
| 2014-06-10 | 14061234-01 | ND |
| 2014-06-10 | 14061233-01 | ND |
| 2014-06-10 | 14061235-01 | ND |
| 2014-06-18 | 14062293-01 | ND |
| 2014-08-07 | 14081262-01 | ND |
| 2014-08-07 | 14081267-01 | ND |
| 2014-08-08 | 14081269-01 | ND |
| 2014-08-08 | 14081264-01 | ND |
| 2014-08-08 | 14081266-01 | ND |
| 2014-08-08 | 14081271-01 | ND |
| 2017-05-16 | 16316511 | ND |
| 2017-05-16 | 16316433 | ND |
| 2017-05-16 | 16316459 | ND |
| 2017-05-16 | 16316485 | ND |
| 2017-05-16 | 16316407 | ND |
| 2017-05-16 | 16316381 | ND |
| 2017-08-16 | 16783146 | ND |
| 2017-08-16 | 16783200 | ND |
| 2017-08-16 | 16783173 | ND |
| 2017-08-16 | 16624871 | ND |
| 2017-08-16 | 16624847 | ND |
| 2017-08-16 | 16783119 | ND |