What it means
A P-trap forms a water seal between the fixture and the drain system. The standing water blocks methane and other sewer odors from entering the room while allowing wastewater to flow out.
Traps dry out in unused fixtures, leak at slip joints, or clog with hair and debris. They must vent properly or siphon during heavy drainage events.
Why it matters in Santa Cruz County
Guest baths in Santa Cruz vacation homes often dry out P-traps between rentals, causing mysterious odors mistaken for sewer failures. Tight under-sink spaces in older cottages make trap maintenance a common service call.
Homeowner tip
Run water in guest baths monthly and tighten slip nuts gently if you see slow leaks under the cabinet.
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Related glossary terms
Also explore the Septic Glossary or call 831.225.4344 with questions about your property.