We found 24 public water systems in Grundy county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Ia Regional Utilities Assoc (waverly) | Waverly | 34,245 | 87 | 2 |
| Grundy Center Water Supply | Grundy Center | 2,706 | 0 | 2 |
| Reinbeck Water Supply | Reinbeck | 1,664 | 0 | 4 |
| Dike Water Supply | Dike | 1,209 | 0 | 4 |
| Conrad Water Supply | Conrad | 1,108 | 0 | 4 |
| Wellsburg Water Supply | Wellsburg | 709 | 0 | 24 |
| Holland Water Supply | Holland | 282 | 0 | 1 |
| Stout Water Supply | Stout | 224 | 0 | 16 |
| Dietrick Mobile Home Park | Dike | 212 | 0 | 3 |
| Beaman Water Supply | Beaman | 191 | 0 | 8 |
| That Place, Inc. | Conrad | 158 | 0 | 0 |
| Timothy Christian School | Wellsburg | 60 | 0 | 0 |
| Cue And Brew | County of Grundy | 55 | 0 | 0 |
| Skyway Club | Reinbeck | 54 | 0 | 0 |
| Colfax Center Presbyterian | Holland | 48 | 0 | 0 |
| Morris Inn Steak House | County of Grundy | 47 | 0 | 0 |
| Meester Addition | County of Grundy | 40 | 0 | 0 |
| Oak Leaf Country Club | Reinbeck | 40 | 0 | 0 |
| Paymaster Seeds | County of Grundy | 25 | 0 | 0 |
| Clearview Mobile Home Pk | County of Grundy | 25 | 0 | 0 |
| Green Products | County of Grundy | 25 | 0 | 0 |
| Grundy Museum-grundy Conservat | County of Grundy | 25 | 0 | 0 |
| Wolf Creek Ar-grundy Conservat | County of Grundy | 25 | 0 | 0 |
| Shearn Mem Pk-grundy Conservat | County of Grundy | 25 | 0 | 0 |