Identify whether the source is public, private, or shared
A sanitary backup, street flooding, broken water main, private lateral, sump failure, roof leak, and interior supply line can all put water in a basement but require different source control. Marple Township publishes public-works guidance for storm sewers, sanitary sewers, flooding, and after-hours emergencies on its Public Works page.
Treat the interior by water source and material
Clean supply water may allow more in-place drying than sewage or outdoor floodwater. Carpet, pad, drywall, insulation, cabinets, framing, and contents each need a material-specific decision. Document the source and water path before demolition or broad cleanup changes the evidence.
Plan for the level below and the room next door
Water follows openings, seams, wiring and plumbing paths, and gravity. A ceiling stain, wall base, or wet carpet may be only the visible edge. Moisture mapping should check adjacent rooms and lower levels so reconstruction does not begin around a concealed wet area.