HOMEBUYER GUIDE

Plumbing Red Flags During a Home Inspection

Watch for signs that point to big-ticket plumbing: old materials, active leaks, sewer issues and unpermitted work.

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By PlumberDallas.com editorialUpdated October 14, 2026

Red flags

Gray polybutylene supply pipe
Galvanized pipe with low pressure
Water stains on ceilings or under sinks
Fresh patches in flooring or slab
Slow drains throughout
Water heater past typical life or improperly vented
Plumbing additions with no permit record

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