We found 67 public water systems that could serve the same population as Patterson Seed & Supply (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Wapello Rural Water Assoc. | Ottumwa | 15,601 | 65 | 4 |
| Washington Water Department | Washington | 7,266 | 0 | 10 |
| Kalona Water Dept | Kalona | 2,363 | 0 | 3 |
| Wellman Municipal Waterworks | Wellman | 1,408 | 0 | 35 |
| Riverside Water Supply | Riverside | 993 | 0 | 3 |
| Lake Darling State Park | County of Washington | 800 | 0 | 0 |
| Brighton Municipal Water Supply | Brighton | 660 | 0 | 4 |
| Ainsworth Water Works | Ainsworth | 567 | 0 | 3 |
| Highland High School | Riverside | 405 | 0 | 18 |
| Ainsworth 4 Corners Restaurant | Ainsworth | 400 | 0 | 16 |
| Duckwall Alco Stores Inc | County of Washington | 327 | 0 | 0 |
| Crawfordsville Water Supply | Crawfordsville | 264 | 0 | 1 |
| Crawfordsville Texaco Fast Break | Crawfordsville | 256 | 0 | 0 |
| Jack Hamiltons Club House No | County of Washington | 250 | 0 | 0 |
| Iowa Mennonite School | Kalona | 202 | 0 | 9 |
| Washington Twsp. Elementary School | Kalona | 160 | 0 | 19 |
| Pleasant Plain Elementary Sch | County of Washington | 154 | 0 | 0 |
| Pleasant Plain Elementary Scho | County of Washington | 152 | 0 | 0 |
| Blue Note Cafe | County of Washington | 150 | 0 | 0 |
| Waco Drive In Theater | Washington | 150 | 0 | 0 |
| Marr Park | Ainsworth | 148 | 0 | 10 |
| West Chester Muni Wtr Supply | West Chester | 146 | 0 | 20 |
| Winnfield Mt Union School | County of Washington | 140 | 0 | 0 |
| Stoney Creek Estates | Washington | 132 | 0 | 0 |
| Shiloh | Kalona | 118 | 0 | 0 |
| Delano's Lounge | County of Washington | 100 | 0 | 0 |
| Timberline Estates | Riverside | 95 | 0 | 0 |
| Washington County Home Complex | County of Washington | 80 | 0 | 0 |
| Pathway Christian School | Kalona | 75 | 0 | 0 |
| Farmers Supply Sales Inc | County of Washington | 75 | 0 | 0 |
| Paine's Steakhouse | Ainsworth | 72 | 0 | 0 |
| Washington Golf & Country Club | County of Washington | 70 | 0 | 0 |
| Linn Hollow Mhp | Washington | 68 | 0 | 0 |
| Golden Delight Bakery | Kalona | 68 | 0 | 0 |
| Dairy Mart | Ainsworth | 62 | 0 | 0 |
| Case Power And Equipment (kalona) | County of Washington | 60 | 0 | 0 |
| Deep Rock Station | Washington | 60 | 0 | 0 |
| Him Hearth N Home Cooking | Kalona | 57 | 0 | 0 |
| Lake Trio Homeowners Association | Washington | 57 | 0 | 0 |
| Michelle Ltd. Richmond Tavern | County of Washington | 53 | 0 | 0 |
| Sylvia Ropp Home | Kalona | 47 | 0 | 0 |
| Martha Bender Home | Kalona | 47 | 0 | 0 |
| Hidden Valley Mobile Home Park | Washington | 46 | 0 | 0 |
| Waldschmidt Subdivision | Riverside | 45 | 0 | 0 |
| Sunset Hills Estates Part 2 | Kalona | 45 | 0 | 0 |
| Kalona Golf Course | Kalona | 44 | 0 | 0 |
| Crooked Creek Christian Camp | Washington | 43 | 0 | 0 |
| Eagles Nest | Coppock | 42 | 0 | 0 |
| Mccormick Ford-mercury Inc. | County of Washington | 40 | 0 | 0 |
| Washington Livestock Auction M | County of Washington | 40 | 0 | 0 |
| Farmer's Cashway Lumber Compan | County of Washington | 40 | 0 | 0 |
| Kalona Golf Club | County of Washington | 40 | 0 | 0 |
| Bud's Custom Meats | Riverside | 39 | 0 | 0 |
| Interstate Producers Livstk As | County of Washington | 30 | 0 | 0 |
| Carriage House | Kalona | 30 | 0 | 0 |
| Skunk River Loge | County of Washington | 30 | 0 | 0 |
| Mennonite Church | County of Washington | 30 | 0 | 0 |
| St Annes View | Riverside | 30 | 0 | 0 |
| Windmill Ridge Campground | Kalona | 27 | 0 | 0 |
| The Office | County of Washington | 26 | 0 | 0 |
| Skunk River Lodge | County of Washington | 25 | 0 | 0 |
| Ferne Cliff Ar-wash Conservati | County of Washington | 25 | 0 | 0 |
| Pleasant Valley School | County of Washington | 25 | 0 | 0 |
| Imc Fertilizer | County of Washington | 25 | 0 | 0 |
| First Mississippi Inc | County of Washington | 25 | 0 | 0 |
| A & D Country Kitchen | County of Washington | 25 | 0 | 0 |
| Hutmacher Chevrolet Inc | Washington | 25 | 0 | 0 |