Lead pipes by county in Wisconsin
Lead, galvanized and unknown service lines reported by the water systems serving each Wisconsin county.
| County | Lead | Galv. | Unknown | Systems |
|---|
| Adams County | 0 | 21 | 967 | 6 |
| Ashland County | 536 | 178 | 890 | 5 |
| Barron County | 1 | 546 | 1,876 | 10 |
| Bayfield County | 1 | 113 | 1,149 | 3 |
| Brown County | 66 | 124 | 6,545 | 14 |
| Buffalo County | 0 | 60 | 1,387 | 4 |
| Burnett County | 0 | 21 | 751 | 4 |
| Calumet County | 454 | 3 | 29 | 6 |
| Chippewa County | 1 | 6 | 1,685 | 9 |
| Clark County | 192 | 28 | 1,738 | 9 |
| Columbia County | 211 | 337 | 4,730 | 19 |
| Crawford County | 0 | 2 | 526 | 6 |
| Dane County | 24 | 14 | 4,809 | 32 |
| Dodge County | 1,123 | 554 | 1,620 | 18 |
| Door County | 0 | 10 | 0 | 2 |
| Douglas County | 4,497 | 113 | 391 | 2 |
| Dunn County | 2 | 240 | 3,564 | 6 |
| Eau Claire County | 100 | 122 | 8,245 | 11 |
| Florence County | 0 | 1 | 22 | 2 |
| Fond Du Lac County | 3,298 | 171 | 2,461 | 8 |
| Forest County | 0 | 0 | 457 | 2 |
| Grant County | 22 | 84 | 2,384 | 18 |
| Green County | 62 | 486 | 3,098 | 9 |
| Green Lake County | 73 | 11 | 1,497 | 4 |
| Iowa County | 70 | 66 | 2,092 | 10 |
| Iron County | 0 | 86 | 457 | 4 |
| Jackson County | 1 | 132 | 495 | 6 |
| Jefferson County | 1,782 | 501 | 850 | 14 |
| Juneau County | 0 | 38 | 1,204 | 8 |
| Kenosha County | 1,677 | 209 | 9,707 | 20 |
| Kewaunee County | 345 | 4 | 0 | 3 |
| La Crosse County | 0 | 6 | 1,419 | 13 |
| Lafayette County | 22 | 8 | 98 | 6 |
| Langlade County | 213 | 383 | 1,200 | 2 |
| Lincoln County | 0 | 127 | 2,143 | 4 |
| Manitowoc County | 2,295 | 424 | 2,611 | 7 |
| Marathon County | 4,109 | 91 | 6,736 | 19 |
| Marinette County | 3 | 542 | 2,074 | 8 |
| Marquette County | 0 | 3 | 594 | 1 |
| Milwaukee County | 89,251 | 6 | 35,424 | 15 |
| Monroe County | 5 | 41 | 568 | 7 |
| Oconto County | 12 | 3 | 863 | 4 |
| Oneida County | 0 | 99 | 2,378 | 6 |
| Outagamie County | 822 | 731 | 1,870 | 12 |
| Ozaukee County | 637 | 106 | 2,600 | 23 |
| Pepin County | 0 | 92 | 266 | 1 |
| Pierce County | 0 | 122 | 1,629 | 7 |
| Polk County | 0 | 221 | 2,284 | 9 |
| Portage County | 0 | 0 | 418 | 7 |
| Price County | 1 | 203 | 448 | 2 |
| Racine County | 10,756 | 447 | 859 | 8 |
| Richland County | 24 | 176 | 25 | 1 |
| Rock County | 2,209 | 1,602 | 13,696 | 14 |
| Rusk County | 0 | 154 | 822 | 6 |
| Sauk County | 624 | 413 | 2,837 | 16 |
| Sawyer County | 0 | 20 | 1,398 | 5 |
| Shawano County | 0 | 2 | 1,225 | 7 |
| Sheboygan County | 6,302 | 510 | 2,043 | 12 |
| St. Croix County | 6 | 248 | 2,203 | 11 |
| Taylor County | 0 | 0 | 1 | 1 |
| Trempealeau County | 3 | 104 | 1,798 | 9 |
| Vernon County | 7 | 114 | 717 | 9 |
| Vilas County | 3 | 10 | 252 | 5 |
| Walworth County | 2,107 | 240 | 6,423 | 18 |
| Washburn County | 0 | 189 | 716 | 4 |
| Washington County | 898 | 55 | 108 | 9 |
| Waukesha County | 733 | 40 | 3,360 | 30 |
| Waupaca County | 493 | 401 | 2,664 | 7 |
| Waushara County | 0 | 0 | 34 | 3 |
| Winnebago County | 9,988 | 250 | 5,082 | 8 |
| Wood County | 293 | 266 | 2,902 | 7 |
Systems serving several counties are counted in each. Source: EPA SDWIS service line inventory, 2026 Q3.