We found 116 public water systems in Ontario county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Geneva City | Geneva | 13,334 | 26 | 2 |
| Canandaigua-farmington Consolidated W.d. | Farmington | 13,000 | 14 | 4 |
| Canandaigua City | Canandaigua | 11,264 | 13 | 4 |
| Mcwa - Vwb | Victor | 8,532 | 0 | 3 |
| Canandaigua Town Cons. Wd | Canandaigua | 6,607 | 0 | 4 |
| Canandaigua-hopewell Consolidated Wd | Canandaigua, Hopewell | 3,781 | 0 | 3 |
| Gorham Town Wd | Gorham | 3,420 | 0 | 49 |
| Geneva Wd #2 Csa | Geneva | 2,680 | 0 | 1 |
| Seneca Town Wd | Seneca | 2,625 | 0 | 3 |
| Victor Village | Victor | 2,443 | 0 | 7 |
| Rushville Village | Rushville | 2,341 | 0 | 3 |
| North Farmington Wd | Farmington | 2,300 | 0 | 0 |
| Clifton Springs Village | Clifton Springs | 2,190 | 0 | 0 |
| Phelps Town Consolidated Wd | Phelps | 2,175 | 0 | 6 |
| Phelps Village | Phelps | 2,118 | 0 | 3 |
| Mcwa-richmond | Richmond | 2,000 | 13 | 11 |
| Bloomfield Village Consolidated | Bloomfield | 1,814 | 0 | 7 |
| Manchester Village | Manchester | 1,709 | 0 | 9 |
| Hopewell Consolidated Wd #2 | Hopewell | 1,615 | 0 | 6 |
| West Bloomfield Wd | West Bloomfield | 1,500 | 0 | 0 |
| Shortsville Village | Shortsville | 1,320 | 0 | 12 |
| J Warren Cutler Scout Reserv | South Bristol | 1,300 | 0 | 5 |
| Naples Village | Naples | 1,100 | 0 | 45 |
| Manchester Central Wd | Manchester | 1,000 | 0 | 4 |
| Geneva Wd #3 | Geneva | 960 | 0 | 0 |
| Bristol Harbour Water Corp | South Bristol | 835 | 0 | 35 |
| Clifton Springs Hosp & Clinic | Clifton Springs | 800 | 0 | 0 |
| Geneva Wd #8 | Geneva | 580 | 0 | 0 |
| Port Gibson Wd | Manchester | 475 | 0 | 5 |
| Central Hopewell Wd | Hopewell | 467 | 0 | 0 |
| Hunt Hollow Dev. Corp | Naples | 400 | 0 | 25 |
| Geneva Wd #1 | Geneva | 375 | 0 | 0 |
| Hopewell Wd #1 | Hopewell | 356 | 0 | 0 |
| Orleans Water District | Phelps | 340 | 0 | 0 |
| Bristol Mountain Water Works | South Bristol | 318 | 0 | 62 |
| East Bloomfield Wd #2 | East Bloomfield | 302 | 0 | 5 |
| Geneva Wd #6 | Geneva | 290 | 0 | 0 |
| North Bloomfield Wd | West Bloomfield | 252 | 0 | 0 |
| Bristol Woodlands Campground | Bristol | 250 | 0 | 8 |
| Geneva Wd #5 | Geneva | 250 | 0 | 0 |
| West Lake Rd Benefit Basis Dis | Canandaigua | 220 | 0 | 0 |
| Bristol Wd #1 | Bristol | 203 | 0 | 2 |
| Canandaigua Koa | Farmington | 200 | 0 | 0 |
| Honeoye Valley Mhp | Canadice | 184 | 0 | 40 |
| Camp-in-the-woods | Gorham | 175 | 0 | 0 |
| Manchester Wd #3 | Manchester | 160 | 0 | 0 |
| The Ritz | Manchester | 156 | 0 | 11 |
| The Sawmill | South Bristol | 150 | 0 | 21 |
| Naples Town Wd 1 | Naples | 150 | 0 | 0 |
| Maxfield Hose Company #2 | Naples | 135 | 0 | 0 |
| Country Colony Estates | Canadice | 125 | 0 | 5 |
| Country Side Park | Phelps | 125 | 0 | 46 |
| Geneva Wd #9 | Geneva | 125 | 0 | 0 |
| Geneva Wd #7 | Geneva | 125 | 0 | 0 |
| Willow Creek Mobile Home Park | Manchester | 123 | 0 | 0 |
| Melvin Hill Road Wd | Phelps | 123 | 0 | 0 |
| Geneva Wd #10 | Geneva | 110 | 0 | 0 |
| Cheerful Valley Campground | Phelps | 108 | 0 | 0 |
| WRIGHT COMPONENTS | Phelps | 105 | 0 | 0 |
| East Bloomfield Wd #1 | East Bloomfield | 101 | 0 | 0 |
| Big Oak Golf Course | Phelps | 100 | 0 | 0 |
| Kingdom Hall | Naples | 100 | 0 | 0 |
| Arbor Hill Associates | South Bristol | 100 | 0 | 0 |
| Winged Pheasant Golf Club | Farmington | 100 | 0 | 0 |
| Red Carpet Inn | Phelps | 100 | 0 | 0 |
| Geneva Wd #4 | Geneva | 100 | 0 | 0 |
| R.d. Campbell Hollistics | Phelps | 100 | 0 | 0 |
| Maxwell Road Wd | Farmington | 100 | 0 | 0 |
| Shetler Road Wd | Richmond | 100 | 0 | 0 |
| Ontario County Park | South Bristol | 90 | 0 | 0 |
| Bristol Valley Homes | Bristol | 90 | 0 | 0 |
| Idlewood Manor | Manchester | 87 | 0 | 0 |
| Canandaigua-bristol Wd | Canandaigua | 87 | 0 | 0 |
| Parkview Fairways Golf Course | East Bloomfield | 80 | 0 | 0 |
| Halfway Haus | Phelps | 80 | 0 | 0 |
| Landrys Tavern | Phelps | 75 | 0 | 0 |
| St. Johns Lutheran Church | Victor | 75 | 0 | 0 |
| 4-h Camp Bristol Hills Pool | Bristol | 75 | 0 | 0 |
| Outlet Road Mobile Home Park | Manchester | 72 | 0 | 0 |
| Geneva Wd #12 | Geneva | 60 | 0 | 0 |
| Spafford Road Wd | Phelps | 60 | 0 | 0 |
| Country Manor Trailer Park | Manchester | 57 | 0 | 0 |
| Riverside Park | Phelps | 56 | 0 | 0 |
| Grape Country Estates | Naples | 51 | 0 | 0 |
| Honeoye Fish & Game Club | Richmond | 50 | 0 | 0 |
| Monicas Pies | Naples | 50 | 0 | 0 |
| 4-h Camp Bristol Hills | Bristol | 50 | 0 | 0 |
| Hill Cumorah | Manchester | 50 | 0 | 0 |
| West Lake Campground | Canadice | 50 | 0 | 0 |
| Rock Haven Mobile Manor | Manchester | 50 | 0 | 0 |
| Trident Marine | Richmond | 50 | 0 | 0 |
| Mountain Rise Organics | Naples | 50 | 0 | 0 |
| Marbletown-white Road Wd | Phelps | 45 | 0 | 0 |
| Sweet Solutions | West Bloomfield | 45 | 0 | 0 |
| Manchester Wd #4 | Manchester | 45 | 0 | 0 |
| East Bloomfield Wd #2, Ext #2 | East Bloomfield | 38 | 0 | 0 |
| East Bloomfield Wd #4 | East Bloomfield | 36 | 0 | 0 |
| Hidden Hollow | South Bristol | 32 | 0 | 0 |
| Moore Memorial Vfw Post 8726 | Naples | 30 | 0 | 0 |
| Red Jacket Orchards | Geneva | 25 | 0 | 0 |
| Smith Boys Jansen Marina | South Bristol | 25 | 0 | 0 |
| Cummings Nature Center | South Bristol | 25 | 0 | 0 |
| Gale-wyn Farm | Bristol | 25 | 0 | 0 |
| Heron Hill On Canandaigua | Canandaigua | 25 | 0 | 0 |
| Locust Lodge | West Bloomfield | 25 | 0 | 0 |
| Locks Stock-n-barrell, Inc. | South Bristol | 25 | 0 | 0 |
| Scotts Fish-n-chips | Manchester | 25 | 0 | 0 |
| Nancys Creative Cutouts | Phelps | 25 | 0 | 0 |
| The Apple Farm | Victor | 25 | 0 | 0 |
| Ann Marie Confections | Manchester | 25 | 0 | 0 |
| Elderlee,inc-galvanizing Plant | Phelps | 25 | 0 | 0 |
| Clements Country Store | Bristol | 25 | 0 | 0 |
| Bristol Trading Post | Bristol | 25 | 0 | 0 |
| Elderlee, Inc.- Steel Plant | Phelps | 20 | 0 | 0 |
| North Star Village | South Bristol | 10 | 0 | 0 |
| Signature Cakes | Richmond | 10 | 0 | 0 |