Lead pipes by county in Montana
Lead, galvanized and unknown service lines reported by the water systems serving each Montana county.
| County | Lead | Galv. | Unknown | Systems |
|---|
| Beaverhead County | 4 | 0 | 1,577 | 6 |
| Big Horn County | 3 | 27 | 866 | 2 |
| Blaine County | 3 | 0 | 3 | 2 |
| Broadwater County | 0 | 8 | 561 | 2 |
| Carbon County | 0 | 61 | 2,134 | 6 |
| Cascade County | 157 | 762 | 5,644 | 12 |
| Chouteau County | 6 | 34 | 642 | 5 |
| Custer County | 0 | 0 | 226 | 2 |
| Daniels County | 0 | 0 | 3 | 1 |
| Dawson County | 2 | 0 | 2,113 | 2 |
| Deer Lodge County | 0 | 1 | 0 | 2 |
| Fallon County | 0 | 7 | 403 | 4 |
| Fergus County | 4 | 60 | 2,268 | 3 |
| Flathead County | 40 | 60 | 6,387 | 46 |
| Gallatin County | 3 | 134 | 2,505 | 15 |
| Garfield County | 0 | 0 | 268 | 1 |
| Glacier County | 0 | 4 | 1,182 | 3 |
| Golden Valley County | 0 | 5 | 15 | 1 |
| Granite County | 0 | 0 | 0 | 1 |
| Hill County | 140 | 0 | 2 | 2 |
| Jefferson County | 0 | 1 | 418 | 3 |
| Judith Basin County | 2 | 13 | 291 | 2 |
| Lake County | 0 | 2 | 2,367 | 7 |
| Lewis And Clark County | 1 | 155 | 499 | 16 |
| Liberty County | 2 | 4 | 3 | 1 |
| Lincoln County | 0 | 114 | 605 | 5 |
| Madison County | 0 | 94 | 968 | 5 |
| McCone County | 2 | 0 | 19 | 2 |
| Meagher County | 0 | 36 | 596 | 1 |
| Mineral County | 0 | 0 | 0 | 1 |
| Missoula County | 0 | 0 | 1,035 | 14 |
| Musselshell County | 2 | 0 | 214 | 2 |
| Park County | 8 | 163 | 3,537 | 8 |
| Petroleum County | 0 | 0 | 137 | 1 |
| Phillips County | 1 | 32 | 552 | 2 |
| Pondera County | 0 | 0 | 0 | 1 |
| Powder River County | 0 | 0 | 2 | 1 |
| Powell County | 0 | 10 | 1,347 | 2 |
| Ravalli County | 2 | 69 | 3,433 | 5 |
| Richland County | 1 | 16 | 486 | 4 |
| Roosevelt County | 0 | 0 | 1 | 2 |
| Rosebud County | 0 | 10 | 780 | 2 |
| Sanders County | 0 | 8 | 447 | 6 |
| Sheridan County | 3 | 18 | 949 | 3 |
| Silver Bow County | 20 | 536 | 12,774 | 2 |
| Stillwater County | 1 | 31 | 1,309 | 2 |
| Sweet Grass County | 0 | 0 | 0 | 1 |
| Teton County | 1 | 22 | 74 | 4 |
| Toole County | 5 | 17 | 699 | 7 |
| Treasure County | 2 | 3 | 1 | 1 |
| Valley County | 12 | 19 | 2,088 | 6 |
| Wheatland County | 38 | 44 | 44 | 2 |
| Wibaux County | 9 | 3 | 251 | 1 |
| Yellowstone County | 5 | 158 | 3,122 | 15 |
Systems serving several counties are counted in each. Source: EPA SDWIS service line inventory, 2026 Q3.