Philadelphia Water Department 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.
Official inventory page: https://water.phila.gov/service-line-map
Official lookup: https://water.phila.gov/service-line/check/
Use the source stack that supports this interim route.
Philadelphia Water Department says its service line map categorizes properties as lead non-lead galvanized metal incomplete records or mixed based on available records and verification points.
Philadelphia Water Department says letters mailed in November 2024 and December 2025 provided information about customer-owned service line materials at every property.