City Water Leaks
City Water Leaks in an RV
City water leaks can be simple, but they can also become serious quickly because the RV plumbing is pressurized the whole time the spigot is on.
I look at these problems a little differently now because a small drip outside can be harmless, while a small drip inside a cabinet can damage flooring, walls, or hidden wood before an owner notices it.
The first goal is not to replace parts. The first goal is to figure out whether the leak is outside the RV, at the city-water inlet, or somewhere inside the plumbing system.
Common Signs
- Water dripping at the hose connection
- Water running down the exterior wall
- Water leaking near the city-water inlet
- Pump cycling when city water is disconnected
- Wet flooring or cabinets
- Reduced pressure at fixtures
- Water appearing only when hooked to campground water
Start With the Hose and Washer
The easiest thing to check is the hose washer. A damaged, flattened, or missing washer can cause a leak that looks worse than it really is.
I would check the hose end, the washer, and the threads before assuming the city-water inlet has failed.
A small rubber washer is cheap compared with replacing fittings that were never bad.
Pressure Regulators Matter
Campground pressure can vary a lot. Some parks have weak pressure, while others can be high enough to stress RV plumbing.
A good pressure regulator helps protect the RV. Without one, small fittings, plastic connections, or older plumbing can begin leaking under pressure.
If a leak only happens at one campground, incoming pressure should be part of the troubleshooting process.
City-Water Inlet Problems
The city-water inlet has threads, seals, and usually a check valve behind it. Any of those can leak.
If water drips outside around the connection, the problem may be the hose washer or inlet threads. If water appears inside behind the inlet, the fitting or connection behind the wall needs closer inspection.
This is where I would stop forcing fittings tighter. Overtightening can crack plastic parts.
Check Inside Near the Inlet
After connecting city water, I like to look inside the RV near the wall where the inlet enters.
Check cabinets, storage bays, flooring, and nearby plumbing lines. Sometimes the outside connection looks dry but the inside fitting is leaking slowly.
That kind of leak can cause damage before it becomes obvious.
Pump Versus City Water Clues
If the leak only happens on city water, the problem may involve city-water pressure, the inlet, or a pressurized fitting.
If the pump also causes the leak, the issue is probably somewhere in the RV plumbing system itself.
That comparison is useful because it separates campground pressure problems from coach plumbing problems.
When To Stop
If water is entering walls, cabinets, electrical areas, flooring, or structural spaces, stop and dry the area. Water damage spreads quickly in RVs.
If the leak is behind a wall or near electrical components, qualified service is the safer path.
Recommended Products
These are common items RV owners may use when checking this type of problem. Add final affiliate links only after confirming the exact products you want to recommend.
- Adjustable water pressure regulator with gauge
- Drinking-water-safe RV hose washers
- RV water hose quick-connect fittings
- Teflon tape for threaded fittings
- Inline RV water filter