Lead pipes by county in Ohio
Lead, galvanized and unknown service lines reported by the water systems serving each Ohio county.
| County | Lead | Galv. | Unknown | Systems |
|---|
| Adams County | 0 | 0 | 701 | 5 |
| Allen County | 4,652 | 110 | 23,413 | 5 |
| Ashland County | 0 | 137 | 2,877 | 3 |
| Ashtabula County | 204 | 927 | 7,018 | 9 |
| Athens County | 2 | 16 | 8,413 | 11 |
| Auglaize County | 93 | 352 | 2,364 | 6 |
| Belmont County | 96 | 176 | 18,697 | 10 |
| Brown County | 4 | 0 | 510 | 5 |
| Butler County | 8,303 | 337 | 23,908 | 12 |
| Carroll County | 1 | 6 | 406 | 3 |
| Champaign County | 25 | 1,314 | 2,598 | 6 |
| Clark County | 426 | 2,980 | 23,023 | 15 |
| Clermont County | 0 | 0 | 8,259 | 9 |
| Clinton County | 185 | 317 | 4,922 | 5 |
| Columbiana County | 826 | 1,362 | 13,100 | 9 |
| Coshocton County | 0 | 1,413 | 5,313 | 1 |
| Crawford County | 97 | 305 | 10,066 | 3 |
| Cuyahoga County | 147,858 | 991 | 62,470 | 6 |
| Darke County | 2,065 | 112 | 1,332 | 8 |
| Defiance County | 5 | 156 | 2,805 | 4 |
| Delaware County | 45 | 169 | 20,726 | 3 |
| Erie County | 7,281 | 269 | 2,457 | 10 |
| Fairfield County | 20 | 2,415 | 4,364 | 11 |
| Fayette County | 92 | 566 | 2,899 | 3 |
| Franklin County | 25,244 | 8,630 | 82,177 | 21 |
| Fulton County | 3 | 181 | 1,073 | 7 |
| Gallia County | 0 | 34 | 2,869 | 2 |
| Geauga County | 0 | 7 | 0 | 6 |
| Greene County | 1 | 441 | 231 | 11 |
| Guernsey County | 520 | 89 | 5,612 | 5 |
| Hamilton County | 35,652 | 247 | 19,470 | 11 |
| Hancock County | 0 | 26 | 175 | 4 |
| Hardin County | 1 | 36 | 4,114 | 6 |
| Harrison County | 4 | 0 | 249 | 4 |
| Henry County | 14 | 68 | 2,001 | 5 |
| Highland County | 0 | 3 | 3,403 | 5 |
| Hocking County | 0 | 2 | 3,495 | 3 |
| Holmes County | 13 | 28 | 1,404 | 7 |
| Huron County | 287 | 243 | 6,977 | 10 |
| Jackson County | 0 | 1 | 4,857 | 4 |
| Jefferson County | 237 | 222 | 12,235 | 11 |
| Knox County | 1 | 242 | 4,271 | 4 |
| Lake County | 0 | 160 | 28,296 | 5 |
| Lawrence County | 0 | 0 | 1,138 | 5 |
| Licking County | 0 | 2,492 | 5,735 | 13 |
| Logan County | 312 | 71 | 5,815 | 7 |
| Lorain County | 554 | 557 | 26,057 | 16 |
| Lucas County | 3,277 | 6,647 | 42,451 | 7 |
| Madison County | 93 | 148 | 1,847 | 8 |
| Mahoning County | 1,408 | 1,869 | 21,790 | 5 |
| Marion County | 3,371 | 230 | 6,576 | 2 |
| Medina County | 315 | 293 | 2,528 | 7 |
| Meigs County | 0 | 3 | 3,495 | 5 |
| Mercer County | 0 | 9 | 34 | 6 |
| Miami County | 603 | 916 | 12,483 | 9 |
| Monroe County | 0 | 2 | 1,629 | 5 |
| Montgomery County | 9,628 | 1,328 | 43,923 | 16 |
| Morgan County | 2 | 12 | 574 | 4 |
| Morrow County | 16 | 17 | 1,091 | 3 |
| Muskingum County | 64 | 220 | 13,079 | 9 |
| Noble County | 0 | 2 | 1,440 | 5 |
| Ottawa County | 65 | 19 | 2,804 | 7 |
| Paulding County | 63 | 13 | 237 | 4 |
| Perry County | 3 | 74 | 5,877 | 10 |
| Pickaway County | 11 | 521 | 1,757 | 10 |
| Pike County | 0 | 0 | 827 | 4 |
| Portage County | 1 | 68 | 2,867 | 11 |
| Preble County | 115 | 142 | 3,112 | 9 |
| Putnam County | 5 | 0 | 2,381 | 8 |
| Richland County | 681 | 156 | 17,093 | 14 |
| Ross County | 0 | 0 | 952 | 7 |
| Sandusky County | 242 | 567 | 2,879 | 4 |
| Scioto County | 0 | 0 | 19,122 | 15 |
| Seneca County | 3,714 | 172 | 5,607 | 7 |
| Shelby County | 589 | 123 | 2,868 | 7 |
| Stark County | 1,664 | 3,656 | 22,325 | 15 |
| Summit County | 3,016 | 7,674 | 18,720 | 12 |
| Trumbull County | 2,026 | 393 | 26,214 | 15 |
| Tuscarawas County | 62 | 416 | 13,443 | 12 |
| Union County | 23 | 8 | 1,619 | 2 |
| Van Wert County | 1 | 8 | 192 | 4 |
| Vinton County | 0 | 199 | 18 | 1 |
| Warren County | 10 | 479 | 790 | 11 |
| Washington County | 49 | 151 | 9,068 | 13 |
| Wayne County | 6 | 332 | 3,445 | 14 |
| Williams County | 593 | 125 | 4,304 | 9 |
| Wood County | 201 | 129 | 8,115 | 11 |
| Wyandot County | 1 | 101 | 2,017 | 4 |
Systems serving several counties are counted in each. Source: EPA SDWIS service line inventory, 2026 Q3.