Verify material and condition before recommending replacement

Collect prior contracts, permits, plans, inspection reports, renovation dates, and photographs of legitimately exposed piping. Label location because supply, drain, vent, heating, and service materials can differ.

Do not infer galvanized, copper, lead, cast iron, clay, or plastic from neighborhood, age, water color, or one fitting. Concealed transitions and partial replacements are common possibilities that require property evidence.

Ask the plumber to identify observed material, joining method, condition, functional symptom, inaccessible area, testing basis, repair compatibility, and why a proposed boundary is local or broader.

Update the system map with verified material and location after work. Retain removed identifiers or photographs supplied safely, permit records, transition details, tests, and remaining unknown segments.