Lead pipes by county in Washington
Lead, galvanized and unknown service lines reported by the water systems serving each Washington county.
| County | Lead | Galv. | Unknown | Systems |
|---|---|---|---|---|
| Adams County | 86 | 0 | 670 | 5 |
| Asotin County | 0 | 0 | 0 | 2 |
| Benton County | 0 | 162 | 765 | 19 |
| Chelan County | 1 | 146 | 2,479 | 15 |
| Clallam County | 0 | 0 | 4,235 | 18 |
| Clark County | 0 | 14 | 2,027 | 8 |
| Columbia County | 0 | 0 | 0 | 1 |
| Cowlitz County | 0 | 146 | 6,674 | 17 |
| Douglas County | 11 | 36 | 67 | 7 |
| Ferry County | 0 | 0 | 229 | 5 |
| Franklin County | 0 | 10 | 10,565 | 5 |
| Garfield County | 0 | 0 | 18 | 2 |
| Grant County | 43 | 364 | 4,684 | 25 |
| Grays Harbor County | 0 | 221 | 6,223 | 18 |
| Island County | 2 | 247 | 2,918 | 50 |
| Jefferson County | 0 | 0 | 151 | 6 |
| King County | 25 | 972 | 47,500 | 92 |
| Kitsap County | 0 | 359 | 14,461 | 96 |
| Kittitas County | 0 | 1 | 4,778 | 9 |
| Klickitat County | 8 | 89 | 3,307 | 12 |
| Lewis County | 0 | 4 | 1,137 | 16 |
| Lincoln County | 0 | 0 | 341 | 6 |
| Mason County | 2 | 28 | 6,383 | 62 |
| Okanogan County | 1 | 568 | 593 | 20 |
| Pacific County | 0 | 10 | 541 | 9 |
| Pend Oreille County | 1 | 0 | 1,127 | 9 |
| Pierce County | 1 | 139 | 29,928 | 128 |
| San Juan County | 0 | 2 | 196 | 8 |
| Skagit County | 12 | 51 | 9,754 | 14 |
| Skamania County | 1 | 0 | 152 | 7 |
| Snohomish County | 0 | 3 | 28,372 | 39 |
| Spokane County | 0 | 1,060 | 6,413 | 42 |
| Stevens County | 0 | 659 | 2,399 | 13 |
| Thurston County | 0 | 2 | 5,320 | 98 |
| Walla Walla County | 0 | 0 | 205 | 7 |
| Whatcom County | 32 | 16 | 4,498 | 40 |
| Whitman County | 1 | 919 | 1,545 | 11 |
| Yakima County | 10 | 457 | 9,444 | 25 |
Systems serving several counties are counted in each. Source: EPA SDWIS service line inventory, 2026 Q3.