Frequent residential plumbing code violations observed during home inspections include: 1. Improper drain-waste-vent (DWV) sloping, which causes sluggish drainage; 2. Missing or improperly installed cleanout ports; 3. Lack of proper pipe venting, leading to trap siphoning; 4. Using incorrect pipe materials or joining incompatible metals without dielectric unions; 5. Installing water heater temperature and pressure relief valves without proper discharge piping leading to a safe location. These violations risk structural water damage.
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