Diquat
Maryland American Water Company
Diquat is a herbicide used on potato crops and aquatic weeds.
17
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 | 3 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-06-18 | 0120003_02_25671 | ND |
| 2014-06-18 | 0120003_01_25676 | ND |
| 2014-08-12 | 0120003_01_26567 | ND |
| 2015-05-12 | 28899901 | ND |
| 2015-05-12 | 28898301 | ND |
| 2015-08-18 | 30218701 | ND |
| 2016-05-10 | 31991801 | ND |
| 2016-05-10 | 31992901 | ND |
| 2016-08-30 | 33406701 | ND |
| 2017-05-09 | 35398201 | ND |
| 2017-05-09 | 35392801 | ND |
| 2017-08-08 | 36568101 | ND |
| 2018-05-08 | 39313201 | ND |
| 2018-05-15 | 39310701 | ND |
| 2018-08-08 | 40555301_A | ND |
| 2019-05-16 | 438938 | ND |
| 2019-05-21 | 438925 | ND |