Diquat
Erie City Water Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
21
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 | 5 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2014-05-13 | 3024695 | ND |
| 2014-05-13 | 3024695 | ND |
| 2014-09-10 | 3100925 | ND |
| 2014-09-23 | 3109573 | ND |
| 2014-09-23 | 3109573 | ND |
| 2015-04-15 | 12962992 | ND |
| 2015-05-06 | 13585664 | ND |
| 2015-08-18 | 13341562 | ND |
| 2015-09-17 | 13585735 | ND |
| 2016-05-24 | 14507019 | ND |
| 2016-07-20 | 14841789 | ND |
| 2016-08-23 | 15015282 | ND |
| 2017-05-16 | 16355435 | ND |
| 2017-07-13 | 16506461 | ND |
| 2017-09-20 | 16822129 | ND |
| 2018-01-08 | 3849224 | ND |
| 2018-05-21 | 3941484 | ND |
| 2018-08-21 | 4030515 | ND |
| 2019-05-21 | 4302822 | ND |
| 2019-09-10 | 4415506 | ND |
| 2019-11-18 | 4489102 | ND |