We found 123 public water systems in Warren county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Western Water Company | Goshen | 40,000 | 12 | 16 |
| Warren Co. Richard Renneker Pws | Lebanon | 35,351 | 12 | 45 |
| Warren Co. Franklin Area Pws | Lebanon | 31,968 | 12 | 25 |
| Lebanon City | Lebanon | 20,500 | 40 | 18 |
| Springboro Pws | Springboro | 17,500 | 20 | 12 |
| Warren Co. Socialville Pws | Lebanon | 11,591 | 40 | 0 |
| Franklin Public Water System | Franklin | 11,396 | 17 | 50 |
| Mason, City Of | Mason | 11,000 | 0 | 0 |
| Mason, City Of - South | Mason | 11,000 | 0 | 0 |
| Lebanon, City Of-plant 1 | County of Warren | 8,500 | 0 | 0 |
| Lebanon Correctional Institution | Lebanon | 6,000 | 0 | 25 |
| Warren Co. Franklin/lebanon Pws | County of Warren | 4,125 | 0 | 0 |
| South Lebanon Village Pws | County of Warren | 4,115 | 0 | 20 |
| Waynesville Village Pws | County of Warren | 3,187 | 0 | 10 |
| Kings Island Pws | County of Warren | 3,180 | 0 | 10 |
| Morrow Village Pws | County of Warren | 2,200 | 0 | 24 |
| Lebanon, City Of-plant 2 | County of Warren | 1,657 | 0 | 0 |
| Otterbein-lebanon Retreat Center | County of Warren | 1,541 | 0 | 31 |
| Warren Co. Massie Wayne Pws | County of Warren | 1,534 | 0 | 0 |
| Sunoco 3202 | Carlisle | 1,500 | 0 | 0 |
| Supt-springboro Mill St.wtp | Springboro | 1,001 | 0 | 0 |
| Warren Co,socialville Wat.area | County of Warren | 1,000 | 0 | 0 |
| Carlisle Elementary/middle Schools | County of Warren | 924 | 0 | 72 |
| Warren Co. Pennyroyal Area Pws | County of Warren | 902 | 0 | 1 |
| Mgr,larrick Transporation Co. | County of Warren | 900 | 0 | 0 |
| Carlisle City Pws | County of Warren | 882 | 0 | 27 |
| Shadow Lake Village Mhp | Mason | 857 | 0 | 0 |
| Mgr,s B Craig Co -water Hauler | County of Warren | 700 | 0 | 0 |
| Harveysburg,village Of | Harveysburg | 700 | 0 | 0 |
| Warren County-roachester San D | County of Warren | 690 | 0 | 0 |
| Mgr,woody's Water Service Co. | County of Warren | 600 | 0 | 0 |
| Carlisle High School | County of Warren | 571 | 0 | 24 |
| Mgr,schaut Water Service Co. | County of Warren | 500 | 0 | 0 |
| Corwin Village Pws | County of Warren | 498 | 0 | 0 |
| Big Turtle Lakes Campgrd,mgr. | County of Warren | 480 | 0 | 0 |
| Mgr.,shadow Lake Village Mhp | County of Warren | 450 | 0 | 0 |
| Mgr,walker's Water Service Co. | County of Warren | 450 | 0 | 0 |
| Hillcrest Baptist Church Pws | County of Warren | 300 | 0 | 2 |
| Oh Hist Soc,ft.ancient-spr | County of Warren | 300 | 0 | 0 |
| The Meadows | County of Warren | 300 | 0 | 0 |
| Mgr,mccanless Water Hauling Co | County of Warren | 300 | 0 | 0 |
| Camp Swonkey | County of Warren | 275 | 0 | 0 |
| Little Miami Estates-mhp | South Lebanon | 250 | 0 | 0 |
| Country Kitchen | County of Warren | 250 | 0 | 0 |
| Rivers Crossing | County of Warren | 200 | 0 | 0 |
| Odot-rest Area 8-38 | County of Warren | 175 | 0 | 0 |
| Odot-rest Area 8-33 | County of Warren | 175 | 0 | 0 |
| Mill Run Day Camp | Waynesville | 170 | 0 | 0 |
| Mill Run Day Camp | County of Warren | 170 | 0 | 0 |
| Millers Campground | County of Warren | 170 | 0 | 0 |
| Kings Domain | County of Warren | 153 | 0 | 0 |
| Ceasars Creek Mart | County of Warren | 150 | 0 | 0 |
| New Jersey Presbyterian | Carlisle | 150 | 0 | 0 |
| Mgr,cockerham Water Hauling Co | County of Warren | 150 | 0 | 0 |
| Camp Butterworth | County of Warren | 150 | 0 | 0 |
| Camp Kern-dayton Ymca | County of Warren | 150 | 0 | 0 |
| Mgr,williams Gen'l.hauling Co. | County of Warren | 150 | 0 | 0 |
| Olive Branch Campground | County of Warren | 150 | 0 | 0 |
| Sycamore Creek Country Club | County of Warren | 150 | 0 | 0 |
| Whistle Stop Center | Carlisle | 150 | 0 | 0 |
| Warren Co. Sharts Road Pws | County of Warren | 145 | 0 | 3 |
| Harveysburg Community Center | County of Warren | 145 | 0 | 0 |
| Mgr,waynesville Water Serv.co. | County of Warren | 125 | 0 | 0 |
| Fort Ancient Campground | County of Warren | 120 | 0 | 0 |
| Wayne Mobile Inc | County of Warren | 118 | 0 | 0 |
| Carter Lumber Company | Carlisle | 107 | 0 | 0 |
| Frontier Campground | County of Warren | 100 | 0 | 0 |
| Cookies Market | County of Warren | 100 | 0 | 0 |
| Ohs-ft. Ancient | County of Warren | 100 | 0 | 0 |
| Odnr-r.access Pt-ft Ancient | County of Warren | 100 | 0 | 0 |
| Kesling Park | Lebanon | 100 | 0 | 0 |
| Sycamore Creek Country C | Springboro | 100 | 0 | 0 |
| The Golf Ranch Inc Pws | County of Warren | 100 | 0 | 0 |
| Kingswood Golf Course-clubhouse Pws | County of Warren | 100 | 0 | 0 |
| Carlisle Village Hall | Carlisle | 100 | 0 | 0 |
| Pizza Hotline | Carlisle | 100 | 0 | 0 |
| Larrys Service Center | County of Warren | 100 | 0 | 0 |
| Lake Manor Restaurant | County of Warren | 100 | 0 | 0 |
| Morgans Canoe Rental | Oregonia | 100 | 0 | 0 |
| Bp Oil Station 4845 | County of Warren | 100 | 0 | 0 |
| Waynesville Lumber & Supply | Waynesville | 100 | 0 | 0 |
| Carlisle Manor Health C. | Carlisle | 98 | 0 | 0 |
| Caesars Lake Mhp Pws | County of Warren | 90 | 0 | 0 |
| Bel Wood Country Club | County of Warren | 80 | 0 | 0 |
| Holly Hills Golf Club | County of Warren | 75 | 0 | 0 |
| Warren Co. Beal Rd Pws | County of Warren | 70 | 0 | 0 |
| Gross Lumber Company,manager | County of Warren | 70 | 0 | 0 |
| Mgr,mellott Water Service Co. | County of Warren | 60 | 0 | 0 |
| Little Miami Canoe Rental Pws | County of Warren | 50 | 0 | 0 |
| Cozy Dale Camp | County of Warren | 50 | 0 | 0 |
| Little River Cafe | County of Warren | 50 | 0 | 0 |
| Main Street Deli | Springboro | 50 | 0 | 0 |
| 350 Carryout | County of Warren | 50 | 0 | 0 |
| Warren Co. Township Line Pws | County of Warren | 48 | 0 | 0 |
| Mgr,monroe Water Service Co. | County of Warren | 45 | 0 | 0 |
| Mgr,shaner Water Service Co. | County of Warren | 45 | 0 | 0 |
| Ikg Borden | Carlisle | 40 | 0 | 0 |
| Camp Wy-ca-key,dayton Ymca | County of Warren | 40 | 0 | 0 |
| Train Stop Inn | County of Warren | 40 | 0 | 0 |
| Mgr,mikesell Water Hauling Co. | County of Warren | 35 | 0 | 0 |
| Camp Lebanon,manager | County of Warren | 33 | 0 | 0 |
| Camp Lebanon | County of Warren | 33 | 0 | 0 |
| American Atm Solutions | County of Warren | 30 | 0 | 0 |
| Bob's Phillips 66 | County of Warren | 30 | 0 | 0 |
| Palace Billiards | Carlisle | 30 | 0 | 0 |
| Whiteacres Oak Hill | Morrow | 25 | 0 | 0 |
| Hwy Pat-lebanon Post | Columbus | 25 | 0 | 0 |
| Carlisle Firehouse | Carlisle | 25 | 0 | 0 |
| Kingswood Golf Course-#14 Pws | Mason | 25 | 0 | 0 |
| Mgr,burnell Water Hauling Co. | County of Warren | 25 | 0 | 0 |
| Caesars Creek Trading Post,mgr | County of Warren | 25 | 0 | 0 |
| Carlisle Baseball Association Pws | County of Warren | 25 | 0 | 0 |
| Carlisle Family Practice | Carlisle | 25 | 0 | 0 |
| Chiefs Lake | County of Warren | 25 | 0 | 0 |
| King Kwik #152 | County of Warren | 25 | 0 | 0 |
| Agri-urban,inc | County of Warren | 21 | 0 | 0 |
| Carlisle Firestation | Carlisle | 20 | 0 | 0 |
| Mgr-heffners Ivy Cottage N.h. | County of Warren | 19 | 0 | 0 |
| Pres.,society For Handicapped | County of Warren | 19 | 0 | 0 |
| Franklin Twp Adm Building | County of Warren | 8 | 0 | 0 |
| Camp Hook-bsa | Franklin | 1 | 0 | 0 |
| Riverside Inn | County of Warren | 1 | 0 | 0 |
| Uncle Toms Lounge | County of Warren | 1 | 0 | 0 |