Detroit Water and Sewerage 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://detroitmi.gov/departments/water-and-sewerage-department/dwsd-projects/making-detroit-lead-safe/lead-service-line-replacement-program
Official lookup: https://detroitmi.gov/departments/water-and-sewerage-department/dwsd-projects/making-detroit-lead-safe/lead-service-line-replacement-program
Use the source stack that supports this interim route.
Detroit says June 30 2025 notices covered 123387 service lines, updated verification plus predictive modeling still estimate more than 80000 lead service lines citywide, and the replacement page remains the address-level source of record.
Detroit says 123387 notices went to properties with known lead known galvanized or unknown service line materials on June 30 2025 and directs residents back to the updated map and verification tools.