We found 225 public water systems that could serve the same population as Happy Hollow Lake Ass C/o H Sm (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Galesburg | Galesburg | 31,745 | 10 | 3 |
| Abingdon | Abingdon | 3,654 | 0 | 11 |
| Knoxville | Knoxville | 3,183 | 0 | 24 |
| I-74 Spoon River Rest Area Eb | County of Knox | 3,000 | 0 | 0 |
| I74 Spoon River Rest Area | County of Knox | 2,356 | 0 | 22 |
| Galesburg Mhc | County of Knox | 2,015 | 0 | 0 |
| Aqua Illinois-oak Run | County of Knox | 1,800 | 0 | 5 |
| Hill Crctl Ctr | Galesburg Twp | 1,300 | 0 | 0 |
| East Galesburg | East Galesburg | 850 | 0 | 8 |
| Wataga | Wataga | 843 | 0 | 6 |
| YATES CITY | Yates City | 750 | 0 | 14 |
| Oneida | Oneida | 750 | 0 | 8 |
| Williamsfield | Williamsfield | 625 | 0 | 30 |
| Altona | Altona | 531 | 0 | 10 |
| Henderson | Henderson | 319 | 0 | 16 |
| Victoria | Victoria | 316 | 0 | 15 |
| The Moon Drive In Theatre | County of Knox | 300 | 0 | 1 |
| B&g Foods | County of Knox | 300 | 0 | 0 |
| Maquon | Maquon | 284 | 0 | 18 |
| Rio | Rio | 262 | 0 | 41 |
| Laurel Greens Public Golf Cour | County of Knox | 200 | 0 | 11 |
| Midland Coal Co (mecco Mine) | County of Knox | 200 | 0 | 0 |
| Green Diamond | County of Knox | 200 | 0 | 0 |
| Midland Coal Co (mecco Mine) | County of Knox | 200 | 0 | 0 |
| Fellheimer Scout Reservation | County of Knox | 200 | 0 | 0 |
| Windwood Water System, Inc. | County of Knox | 185 | 0 | 9 |
| Cedar Water Company, Inc. | County of Knox | 160 | 0 | 29 |
| Maxey Chapel United Methodist Church | County of Knox | 140 | 0 | 0 |
| Camp Akita Lodge Well | County of Knox | 134 | 0 | 6 |
| Brown Oil Company | County of Knox | 125 | 0 | 0 |
| St Augustine | St Augustine | 120 | 0 | 0 |
| Lake Bracken Cc Clubhouse | County of Knox | 120 | 0 | 0 |
| Camp Shaubena | County of Knox | 120 | 0 | 0 |
| Lake Bracken Club House | County of Knox | 119 | 0 | 0 |
| Camp Akita/a Frame Well | County of Knox | 100 | 0 | 0 |
| Oak Run Camping Area | County of Knox | 100 | 0 | 0 |
| Gamber Cove | County of Knox | 100 | 0 | 0 |
| Lake Bracken C C Pool Well | County of Knox | 100 | 0 | 0 |
| I74 Youth Complex | County of Knox | 100 | 0 | 0 |
| Dahinda Um Church | County of Knox | 100 | 0 | 0 |
| Dons Travel Inn | County of Knox | 100 | 0 | 0 |
| Sherwood Youth Camp A | County of Knox | 100 | 0 | 0 |
| Sherwood Youth Camp | County of Knox | 100 | 0 | 0 |
| Port & Starboard | County of Knox | 100 | 0 | 0 |
| Club 41 | County of Knox | 100 | 0 | 0 |
| Lake Braken (golf Shop) | County of Knox | 100 | 0 | 0 |
| The Old Clubhouse On Lake Calhoun | County of Knox | 100 | 0 | 0 |
| Laurel Greens Pub Golf Course | County of Knox | 100 | 0 | 0 |
| Port & Starboard | County of Knox | 100 | 0 | 0 |
| Lake Bracken (golf Shop) | County of Knox | 100 | 0 | 0 |
| Lake Bracken (club House) | County of Knox | 100 | 0 | 0 |
| Oak Run Camping Area | County of Knox | 100 | 0 | 0 |
| Dons Travel Inn | County of Knox | 100 | 0 | 0 |
| Sherwood Youth Camp A | County of Knox | 100 | 0 | 0 |
| Sherwood Youth Camp B | County of Knox | 100 | 0 | 0 |
| Manson Heights | County of Knox | 100 | 0 | 0 |
| Danceland | County of Knox | 85 | 0 | 0 |
| Community Bible Church | County of Knox | 84 | 0 | 0 |
| Board Of Education | County of Knox | 84 | 0 | 0 |
| Big Mikes Smokehouse | County of Knox | 75 | 0 | 0 |
| Northwood & Island Ln Wtr Assn | Unspec Pl In Co | 75 | 0 | 0 |
| Westport Water Mutual | County of Knox | 61 | 0 | 0 |
| Camp Akita Bathhouse Well | County of Knox | 60 | 0 | 0 |
| Community Bible Church | County of Knox | 60 | 0 | 0 |
| Eagle Country Market | County of Knox | 60 | 0 | 0 |
| Faith Bible Camp | County of Knox | 50 | 0 | 0 |
| Gunther Asphalt Plant #4 | County of Knox | 50 | 0 | 0 |
| Hook & Bullet Conservations C | County of Knox | 50 | 0 | 0 |
| Windmills Golf Course | County of Knox | 50 | 0 | 0 |
| Galesburg Drive-in Theater | County of Knox | 50 | 0 | 0 |
| Faith Bible Camp | County of Knox | 50 | 0 | 0 |
| Oak Run Marina | County of Knox | 50 | 0 | 0 |
| Galesburg Drive-in Theater | County of Knox | 50 | 0 | 0 |
| Indian Point Campground | County of Knox | 50 | 0 | 0 |
| Oak Run Marina | County of Knox | 50 | 0 | 0 |
| Unit School Dist 202 Delong | County of Knox | 48 | 0 | 0 |
| Dixons Travelers Mart | County of Knox | 45 | 0 | 0 |
| Messiah Lutheran Church (77560) | County of Knox | 45 | 0 | 0 |
| Unit School Dist #202(appleton | County of Knox | 44 | 0 | 0 |
| Unit School Dist 202 Appleton | County of Knox | 44 | 0 | 0 |
| Knox Co Breezy Bluff Wtr Corp | County of Knox | 43 | 0 | 0 |
| Unit School Dist #202(de Long) | County of Knox | 40 | 0 | 0 |
| Camp Akita Girls Village | County of Knox | 36 | 0 | 0 |
| Hole In The Wall Health Club & Spa | County of Knox | 35 | 0 | 0 |
| Koppers Company,inc | County of Knox | 35 | 0 | 0 |
| Manson Hts Sbdv | County of Knox | 35 | 0 | 0 |
| Cactus Country | County of Knox | 30 | 0 | 0 |
| Crossroads Bar And Grill | County of Knox | 30 | 0 | 0 |
| Little John Conservation Club | County of Knox | 26 | 0 | 0 |
| Cabin Fever Campground | County of Knox | 26 | 0 | 0 |
| Galesburg Kampground East Inc | County of Knox | 25 | 0 | 0 |
| Whispering Oaks | County of Knox | 25 | 0 | 0 |
| Knox Co Sportsmens Club | County of Knox | 25 | 0 | 0 |
| Double Tree Hills | County of Knox | 25 | 0 | 0 |
| Stonefort Campground | County of Knox | 25 | 0 | 0 |
| Lake Calhoun Association #5 | County of Knox | 25 | 0 | 0 |
| Lake Bracken Cc Golf Course Bath Room | County of Knox | 25 | 0 | 0 |
| Quick Stop | County of Knox | 25 | 0 | 0 |
| Walmart Supercenter #775 | County of Knox | 25 | 0 | 0 |
| Hy-vee Main | County of Knox | 25 | 0 | 0 |
| Hy Vee | County of Knox | 25 | 0 | 0 |
| Hi Lo Grocery Abingdon | County of Knox | 25 | 0 | 0 |
| Hi Lo Market Galesburg | County of Knox | 25 | 0 | 0 |
| Econo Foods (135640) | County of Knox | 25 | 0 | 0 |
| The Watering Hole | County of Knox | 25 | 0 | 0 |
| The Country Store & More | County of Knox | 25 | 0 | 0 |
| Giant Food Store | County of Knox | 25 | 0 | 0 |
| Ladds Food Store Vending Mach | County of Knox | 25 | 0 | 0 |
| Knoxville Iga | County of Knox | 25 | 0 | 0 |
| Econo Foods (129312) | County of Knox | 25 | 0 | 0 |
| Joe's Metal Finishing | County of Knox | 25 | 0 | 0 |
| Fayhee Inc | County of Knox | 25 | 0 | 0 |
| Diet-rite Beverages | County of Knox | 25 | 0 | 0 |
| Rapatee Union Church | County of Knox | 25 | 0 | 0 |
| Wagon Wheel Motel | County of Knox | 25 | 0 | 0 |
| Spoon River Fs Inc | County of Knox | 25 | 0 | 0 |
| Conlon's Garage & Gas Station | County of Knox | 25 | 0 | 0 |
| United Methodist Church | County of Knox | 25 | 0 | 0 |
| Hoffman Seed Farm Co | County of Knox | 25 | 0 | 0 |
| Baird Seed Co | County of Knox | 25 | 0 | 0 |
| Knox Co Highway Dept | County of Knox | 25 | 0 | 0 |
| Gilson Community Church | County of Knox | 25 | 0 | 0 |
| Orange Chapel Church | County of Knox | 25 | 0 | 0 |
| Rest Area I-74 East Bound Idot | County of Knox | 25 | 0 | 0 |
| Knox Co Landfill | County of Knox | 25 | 0 | 0 |
| Standard Oil Co | County of Knox | 25 | 0 | 0 |
| New Windsor Sportsmen's Club | County of Knox | 25 | 0 | 0 |
| Arco Gas Station | County of Knox | 25 | 0 | 0 |
| Dahinda United Methodist Churc | County of Knox | 25 | 0 | 0 |
| Ontario Congregational Church | County of Knox | 25 | 0 | 0 |
| Maxey Chapel Methodist Church | County of Knox | 25 | 0 | 0 |
| Krause Equipment Co | County of Knox | 25 | 0 | 0 |
| Wickes Lumber Co | County of Knox | 25 | 0 | 0 |
| Abingdon Veterinary Clinic | County of Knox | 25 | 0 | 0 |
| De Long Congregational Church | County of Knox | 25 | 0 | 0 |
| Alfanos Pizzeria | County of Knox | 25 | 0 | 0 |
| Little John Consv Club Inc B | County of Knox | 25 | 0 | 0 |
| Little John Consv Club Inc A | County of Knox | 25 | 0 | 0 |
| Lake Calhoun Association #1 | County of Knox | 25 | 0 | 0 |
| Lake Calhoun Association #2 | County of Knox | 25 | 0 | 0 |
| Lake Calhoun Association #3 | County of Knox | 25 | 0 | 0 |
| Gilson Community Church | County of Knox | 25 | 0 | 0 |
| Galesburg East Koa | County of Knox | 25 | 0 | 0 |
| Berean Baptist Church | County of Knox | 25 | 0 | 0 |
| Royal Crown Inc | County of Knox | 25 | 0 | 0 |
| Galesburg Police Pistol Range | County of Knox | 25 | 0 | 0 |
| M&r Oil Co Inc | County of Knox | 25 | 0 | 0 |
| National By Products Inc | County of Knox | 25 | 0 | 0 |
| W R Grace & Co | County of Knox | 25 | 0 | 0 |
| Central Warren Co Fire Distric | County of Knox | 25 | 0 | 0 |
| Harmony Pines | County of Knox | 25 | 0 | 0 |
| Knox Co Highway Dept | County of Knox | 25 | 0 | 0 |
| Gilson Community Church | County of Knox | 25 | 0 | 0 |
| Orange Chapel Church | County of Knox | 25 | 0 | 0 |
| Rest Area I-74 East Bound Idot | County of Knox | 25 | 0 | 0 |
| Knox Co Landfill | County of Knox | 25 | 0 | 0 |
| Standard Oil Co | County of Knox | 25 | 0 | 0 |
| Messiah Lutheran Church | County of Knox | 25 | 0 | 0 |
| Ontario Congregational Church | County of Knox | 25 | 0 | 0 |
| Maxey Chapel Methodist Church | County of Knox | 25 | 0 | 0 |
| Krause Equipment Co | County of Knox | 25 | 0 | 0 |
| Wickes Lumber Co | County of Knox | 25 | 0 | 0 |
| Abingdon Veterinary Clinic | County of Knox | 25 | 0 | 0 |
| De Long Congregational Church | County of Knox | 25 | 0 | 0 |
| New Windsor Sportsmen's Club | County of Knox | 25 | 0 | 0 |
| Arco Gas Station | County of Knox | 25 | 0 | 0 |
| Dahinda United Methodist Churc | County of Knox | 25 | 0 | 0 |
| Sampson Implement Co | County of Knox | 25 | 0 | 0 |
| Empiregas Inc Of Galesburg | County of Knox | 25 | 0 | 0 |
| Tobler Transfer Co | County of Knox | 25 | 0 | 0 |
| Gunther Construction Co (plant | County of Knox | 25 | 0 | 0 |
| Farm Credit Bank | County of Knox | 25 | 0 | 0 |
| Community School Dist 205 Gara | County of Knox | 25 | 0 | 0 |
| Gilson Grain Co | County of Knox | 25 | 0 | 0 |
| Manson Heights Cabins A | County of Knox | 25 | 0 | 0 |
| Manson Heights Cabins B | County of Knox | 25 | 0 | 0 |
| Little John Cons Club B | County of Knox | 25 | 0 | 0 |
| Little John Cons Club A | County of Knox | 25 | 0 | 0 |
| Knox Co Cons Sportsman Club A | County of Knox | 25 | 0 | 0 |
| Lake Calhoun Assn Inc A | County of Knox | 25 | 0 | 0 |
| Lake Calhoun Assn Inc B | County of Knox | 25 | 0 | 0 |
| Lake Calhoun Assn Inc C | County of Knox | 25 | 0 | 0 |
| Quality Water Services Inc | County of Knox | 25 | 0 | 0 |
| Gilson Community Church | County of Knox | 25 | 0 | 0 |
| County of Knox | 25 | 0 | 0 | |
| Wareco Pizza Station Vend Mach | County of Knox | 25 | 0 | 0 |
| Cozy Inn | County of Knox | 25 | 0 | 0 |
| Blue Angel | County of Knox | 25 | 0 | 0 |
| The Junction | County of Knox | 25 | 0 | 0 |
| Green Diamond | County of Knox | 25 | 0 | 0 |
| Club 41 | County of Knox | 25 | 0 | 0 |
| Alfanos Pizzeria | County of Knox | 25 | 0 | 0 |
| Sampson Implement Co | County of Knox | 25 | 0 | 0 |
| Kleine Equipment Inc | County of Knox | 25 | 0 | 0 |
| Tobler Transfer Co | County of Knox | 25 | 0 | 0 |
| Gunther Construction Co (plant | County of Knox | 25 | 0 | 0 |
| Farm Credit Bank | County of Knox | 25 | 0 | 0 |
| Community School Dist 205 Gara | County of Knox | 25 | 0 | 0 |
| Gilson Grain Co | County of Knox | 25 | 0 | 0 |
| Manson Heights Cabins A | County of Knox | 25 | 0 | 0 |
| Manson Heights Cabins B | County of Knox | 25 | 0 | 0 |
| Don's Travel Inn/inactive | County of Knox | 25 | 0 | 0 |
| Maquon Miracle Mart | County of Knox | 25 | 0 | 0 |
| Circle K 1233 Galesburg | County of Knox | 25 | 0 | 0 |
| Happy Hollow Lake Association | County of Knox | 25 | 0 | 0 |
| Joe's Metal Finishing | County of Knox | 25 | 0 | 0 |
| Fayhee Inc | County of Knox | 25 | 0 | 0 |
| Diet-rite Beverages | County of Knox | 25 | 0 | 0 |
| Rapatee Union Church | County of Knox | 25 | 0 | 0 |
| Wagon Wheel Motel | County of Knox | 25 | 0 | 0 |
| Spoon River Fs Inc | County of Knox | 25 | 0 | 0 |
| Conlon's Garage & Gas Station | County of Knox | 25 | 0 | 0 |
| United Methodist Church | County of Knox | 25 | 0 | 0 |
| Hoffman Seed Farm Co | County of Knox | 25 | 0 | 0 |
| Baird Seed Co | County of Knox | 25 | 0 | 0 |
| Kamperstowne | County of Knox | 25 | 0 | 0 |
| Indian Point Campground | County of Knox | 25 | 0 | 0 |
| Berean Baptist Church | County of Knox | 25 | 0 | 0 |
| Royal Crown Inc | County of Knox | 25 | 0 | 0 |
| Galesburg Police Pistol Range | County of Knox | 25 | 0 | 0 |
| M&r Oil Co Inc | County of Knox | 25 | 0 | 0 |
| National By Products Inc | County of Knox | 25 | 0 | 0 |
| W R Grace & Co | County of Knox | 25 | 0 | 0 |
| Central Warren Co Fire Distric | County of Knox | 25 | 0 | 0 |
| Harmony Pines | County of Knox | 25 | 0 | 0 |