Fond Du Lac, WI · PWSID WI4200469
Fond Du Lac Waterworks lead service lines
3,172 lead or galvanized lines to replace
Fond Du Lac Waterworks reported 3,116 lead and 56 galvanized-requiring-replacement service lines out of 16,049 in its inventory. That's 20% of all its lines. Another 377 (2.3%) are still listed as unknown material.
Ranks #11 of 258 Wisconsin systems with confirmed lead lines, and #158 nationally.
20% of Fond Du Lac Waterworks's service lines are lead or galvanized requiring replacement. That's higher than the Wisconsin average (11%) and higher than the national average (3.1%).
- Lead 19%
- Galvanized (replace) 0.3%
- Unknown 2.3%
- Non-lead 78%
Total service lines reported: 16,049. Reported all required service line types. Population served: 44,678; 16,049 connections.
Lead test results
Fond Du Lac Waterworks's most recent 90th-percentile lead result (Jul 2025–Dec 2025) was 6.1 ppb, below both the 15 ppb action level and the 10 ppb level that takes effect in 2027. This means 90% of homes sampled were at or below that level; individual homes, especially those with lead lines, can be higher.
Lead and Copper Rule 90th-percentile results reported to EPA, in parts per billion. Dashed lines: 15 ppb action level and the 10 ppb level from November 1, 2027.
Progress since 2025 Q1
Reported lead and galvanized-requiring-replacement lines went from 3,589 in 2025 Q1 to 3,172 in 2026 Q3: down 417 (12%). Lines of unknown material went from 1,795 to 377, down 1,418 (79%).
Quarterly counts reported to EPA. A drop usually means lines were replaced or confirmed non-lead; a rise usually means more lines were identified. Replacement progress rankings.
Lead rule violations
EPA's data lists no Lead and Copper Rule violations for Fond Du Lac Waterworks since 2015. That covers testing, reporting, corrosion control and public notice requirements; it isn't a guarantee about any individual home.
Source: EPA SDWIS violation records for the Lead and Copper Rule.
Where the water comes from
Fond Du Lac Waterworks's main water source is groundwater (wells).
Source: EPA SDWIS water system and facility records.
Check your own address
These counts cover the whole system. To see whether your line is lead, use the utility's address-level inventory. Utilities had to prepare one by October 16, 2024 and make it publicly accessible; systems serving more than 50,000 people must post it online.
No map yet? Do the 2-minute scratch and magnet test on the pipe where water enters your home.
Protect your drinking water now
If your line is lead, galvanized or unknown, filter water for drinking, cooking and baby formula. Use a filter certified to NSF/ANSI 53 for lead. Run cold water for a few minutes after it sits for hours, and never use hot tap water for cooking.
How to pick a lead-certified filter · How to test your water for lead
Getting the line replaced
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask Fond Du Lac Waterworks whether it replaces the private side for free or with a cost share before you hire anyone. If you want it done sooner, or your utility doesn't cover your side, a licensed plumber can quote it. What replacement costs.
County pages: Lead pipes in Fond Du Lac County
Cities served
ZIP codes served
ZIP codes whose center falls inside Fond Du Lac Waterworks's mapped service area (EPA service area boundaries). Neighboring utilities may serve parts of the same ZIP.
54935
Other water systems nearby
| System | Lead + galv. | Unknown |
|---|---|---|
| Ripon Water Utility | 131 | 1,177 |
| North Fond Du Lac Waterworks | 166 | 598 |
| Campbellsport Waterworks | 0 | 0 |
| Oakfield Waterworks | 0 | 0 |
| Ashwood Grove Edgewater | 0 | 0 |
| Brandon Waterworks | 0 | 296 |
| Mary Hill Park Sanitary Dist | 0 | 13 |
Check another water system
Questions
Does Fond Du Lac Waterworks have lead pipes?
Yes. Fond Du Lac Waterworks reported 3,116 lead service lines and 56 galvanized lines that must be replaced, out of 16,049 total. 377 more are of unknown material.
How do I check if my home's service line is lead?
Look up your address on Fond Du Lac Waterworks's official service line inventory, which utilities must make publicly available. You can also scratch the pipe where it enters your home: lead is soft, dull gray, scratches to shiny silver and does not attract a magnet.
When will Fond Du Lac Waterworks replace lead service lines?
Under EPA's Lead and Copper Rule Improvements, most systems must replace lead and galvanized-requiring-replacement lines by December 31, 2037, starting from November 1, 2027. The rule is being challenged in court, so dates could change. Many utilities run free or cost-share programs now.
Has Fond Du Lac Waterworks had lead violations?
EPA's data shows no Lead and Copper Rule violations since 2015 for Fond Du Lac Waterworks.
Which water filters remove lead?
Use a filter certified to NSF/ANSI Standard 53 for lead reduction, or NSF/ANSI 58 for reverse osmosis. Check the certification on NSF's listings, not just the box.
Embed or cite this data
Local news sites, blogs and community groups can embed this card. It updates when EPA releases new data.
Citation: Lead Pipe Map, "Fond Du Lac Waterworks lead service lines," https://leadpipemap.com/wi/fond-du-lac-waterworks/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.