Diquat
Connecticut Water Company - Northern Region-Western System
Diquat is a herbicide used on potato crops and aquatic weeds.
20
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 |
|---|---|---|---|---|
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 15 | 0 | ND |
| 2023 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2018-01-31 | BZ82950SOC5 | ND |
| 2018-06-28 | CA80715SOC5 | ND |
| 2018-08-03 | CB04980 | ND |
| 2019-01-09 | SOC 200518249 | ND |
| 2019-03-11 | SOC 200524185 | ND |
| 2022-01-31 | CK26558 | ND |
| 2022-02-28 | CK76167 | ND |
| 2022-04-18 | CL11075 | ND |
| 2022-08-26 | CM16197 | ND |
| 2022-08-26 | CM16200 | ND |
| 2022-09-07 | CM25593 | ND |
| 2022-09-08 | CM25670 | ND |
| 2022-09-20 | CM37292 | ND |
| 2022-09-20 | CM37296 | ND |
| 2022-10-04 | CM49624 | ND |
| 2022-10-04 | CM49621 | ND |
| 2022-10-06 | CM51510 | ND |
| 2022-10-06 | CM51504 | ND |
| 2022-10-06 | CM50872 | ND |
| 2022-11-03 | CM76536 | ND |