An RV plumbing leak may come from a pressurized line, fitting, fixture, drain, water heater, pump, valve, or exterior entry point. Shut off the water source if damage is continuing, then document where moisture first appears and which water source was active.
Start with the water source
Record whether the RV was connected to city water, using the onboard tank and pump, or recently switched between them. A symptom that occurs with only one source narrows the possibilities.
Listen to the pump
A pump that cycles when no fixture is open may indicate pressure loss. Turn the pump off if a hidden leak could be feeding water into cabinetry or flooring.
Trace upward and outward
Water follows gravity and framing paths. The lowest wet spot is not always the source. Look above, behind, and around nearby fixtures only where access is safe and owner-approved.
Separate supply leaks from drains
A supply-side leak may appear whenever pressure is present. A drain leak may appear only when a particular sink, shower, or fixture is used. Note the exact trigger.
Consider exterior entry
Rain, washing, or roof and sidewall openings can mimic a plumbing leak. Compare the timing with weather and exterior exposure.
Take useful photos
Start with a wide photo showing location, then closer images of visible moisture and nearby fittings. Do not dismantle panels if doing so could cause damage or expose electricity.
Safety first
Keep water away from electrical components. If moisture reaches energized wiring, outlets, or appliances, disconnect power only when safe and request professional help.
Related RV Wise service
RV Wise provides mobile RV plumbing troubleshooting. Exterior moisture entry may also require roof and sealant evaluation.