Madison Water Utility filter and testing guidance
Use this only as an interim protection layer when replacement is not immediate and the utility-specific next step is still unresolved.
Filters and testing are interim safety layers. They are not equivalent to a utility-confirmed full replacement path.
Use this only when replacement is not immediate: filter guidance sits below inventory, notice, and replacement decisions. It is not a substitute for line replacement.
Use local utility guidance, then narrow to certified interim protection.
Maintenance tips
Use a certified filter as an interim protection step, not as a replacement for line replacement.
Use testing when it changes the next action or clarifies uncertainty.
Return to the utility lookup if the service-line status is still unclear.
Testing should change the next action, not distract from the utility record.
Use the source stack that supports this interim route.
Madison says all known lead services remaining in the city are none and that as of November 4 2025 it has no known lead service lines, while historic records can still contain inaccuracies.
https://www.cityofmadison.com/water/water-quality/lead-copper-in-water/lead-service-line-inventory
Madison tells property owners to determine whether lead service exists on private property and says owners who discover lead may qualify for a rebate up to 3000 dollars if they contact Madison Water instead of relying on a citywide no-cost replacement program.
https://www.cityofmadison.com/water/water-quality/lead-copper-in-water/lead-service-line-inventory