Lead pipes in Wisconsin
Wisconsin's 1,051 community water systems reported 146,354 lead and 12,730 galvanized-requiring-replacement service lines, plus 180,721 of unknown material. That ranks #6 among states for confirmed lead lines.
- Lead 10%
- Galvanized (replace) 0.9%
- Unknown 13%
- Non-lead 76%
11% of the service lines Wisconsin utilities reported are lead or galvanized requiring replacement, well above the national share of 3.1%. 13% are still unidentified (national: 21%). The largest counts are in Milwaukee Waterworks (65,331), Racine Waterworks (10,651), Wauwatosa Waterworks (8,665). 3 systems haven't reported counts yet.
Since 2025 Q1, reported lead and galvanized lines in Wisconsin went from 164,094 to 159,084 (down 5,010). See which systems made the most progress.
Systems with confirmed lead lines (258)
Showing the 100 with the most. All Wisconsin water systems
No confirmed lead, but unknown lines remain (232)
Showing 50. See all
No lead or unknown lines reported (139)
Systems serving 1,000 or more people. Systems without counts on file are listed as 0.
Showing the 50 largest. See all
Lead pipes in Wisconsin cities
- Milwaukee65,331 lead + galv. lines
- Madison2 lead + galv. lines
- Green Bay72 lead + galv. lines
- Kenosha1,801 lead + galv. lines
- Racine10,651 lead + galv. lines
- Appleton731 lead + galv. lines
- Eau Claire101 lead + galv. lines
- Waukesha cityno lead reported
- Oshkosh6,718 lead + galv. lines
- Janesville3 lead + galv. lines
- West Allis7,719 lead + galv. lines
- La Crosseno lead reported
- Sheboygan5,279 lead + galv. lines
- Wauwatosa8,665 lead + galv. lines
- Fond du Lac3,172 lead + galv. lines
- Brookfield485 unknown
- Menomonee Falls4 lead + galv. lines
- New Berlinno lead reported
- Wausau3,580 lead + galv. lines
- Sun Prairieno lead reported
- Oak Creekno lead reported
- Greenfieldno lead reported
- Fitchburg2 lead + galv. lines
- West Bend703 lead + galv. lines
- Mount Pleasant10,651 lead + galv. lines
- Neenah3,318 lead + galv. lines
- Superior4,610 lead + galv. lines
- Stevens Point95 unknown
- Muskego23 unknown
- De Pere49 lead + galv. lines
Wisconsin lead pipe questions
How many lead pipes are in Wisconsin?
Wisconsin's community water systems reported 146,354 lead service lines and 12,730 galvanized lines that must be replaced, for 159,084 in total. Another 180,721 lines are of unknown material.
Which Wisconsin water systems have the most lead pipes?
Milwaukee Waterworks (65,331), Racine Waterworks (10,651), Wauwatosa Waterworks (8,665). Counts are lead plus galvanized-requiring-replacement lines.
What share of Wisconsin service lines are lead?
11% of reported service lines in Wisconsin are lead or galvanized requiring replacement, well above the national figure of 3.1%. 13% are still unknown, compared with 21% nationally.
How do I find out if my Wisconsin home has a lead service line?
Search for your water system or ZIP code above, then open your utility's address-level inventory map. You can also check the pipe where it enters your home with a scratch and magnet test.
Source: EPA SDWIS service line inventory, 2026 Q3. Smaller systems with no lead or unknown lines are omitted. See also national rankings.