October 18, 2026
I keep RV plumbing maintenance focused on three jobs: check for leaks, clean the system, and winterize before temperatures reach 32°F. Before opening fittings, I shut off the water and pump, release pressure, and turn off both water-heater heat sources.
Here’s the routine I follow:
In Utah, I check overnight lows at my destination and storage site - not just at home. <u>The forecast matters more than the calendar.</u> I also keep a service log and call a qualified RV technician for hidden leaks or water damage.
RV Plumbing Maintenance: A Seasonal Checklist
With the system depressurized, open cabinets and access panels. Inspect PEX tubing, hoses, fittings, tank connections, low-point drains, and plumbing compartments. Look for cracks, dampness, stains, corrosion, swollen wood, peeling laminate, or soft flooring.
Check under sinks, around the toilet, behind the shower access panel, and near the pump, filter, and water heater. Water can travel along a hidden line, so the wet spot may not be where the leak starts. Press a dry paper towel against suspect joints to spot slow seepage.
Inspect the city-water inlet, check valve, tank connections, pump, filter housing, faucets, shower, toilet, water-heater connections, drain valves, and visible tubing joints. Check washers, O-rings, filter seals, and fixture cartridges for cracks or distortion.
Replace damaged parts with matching parts of the same size, material, and connection type. Don’t overtighten plastic fittings. Replace cracked parts rather than treating sealant as a permanent fix.
Restore pressure gradually with regulated city water or the onboard pump. Open a faucet to purge air, close all fixtures, and check the connections again for several minutes. Stay within the RV manufacturer’s pressure limit; 45–55 psi is common, but it isn’t universal.
If the pump repeatedly cycles while all fixtures are closed, check for leaks or a faulty check valve before changing the pump settings.
Stop using the system if water reaches electrical parts or soaks floors, walls, insulation, or cabinetry. Shut off the water supply and pump. Disconnect electrical power only if it’s safe to do so.
Photograph wet areas and record the pressure reading, whether the leak happened on city water or the onboard pump, and any temporary repairs. Have a qualified RV technician assess concealed leaks, damaged tank fittings, persistent pump cycling, water-heater faults, or PEX repairs you’re unsure about.
Keep drinking-water gear separate from sewer gear, including a dedicated rinse hose. Follow the manufacturer’s directions for cleaners, sanitizer dilution, contact time, and disposal. Never mix bleach with tank treatments, ammonia, acids, or other cleaners.
Turn off city water and the pump, then drain and flush the fresh-water tank. Bypass the water heater and remove or bypass filters as instructed.
Add the approved sanitizer at the specified dilution, fill as directed, and circulate it through every applicable hot- and cold-water outlet - including exterior sprayers. Allow the full contact time, then drain and flush thoroughly with drinking water. Return bypass valves to normal and replace filters as required.
At an approved dump station, wear gloves and eye protection, secure the sewer hose, and empty the black tank before the gray tank. If your RV has a built-in flush system, use its rinse connection, prevent backflow, and stay with the setup until it finishes.
Shut off rinse water before disconnecting, cap the outlet, and wash your hands. Keep tank valves closed between dumps. Choose a treatment compatible with your RV, tank materials, and wastewater system.
Watch for these signs of trouble while cleaning and using the tanks.
| Tank | Cleaning method | Warning signs |
|---|---|---|
| Fresh water | Approved sanitizer, required contact time, potable-water flushing | Lingering chlorine taste or odor, cloudy water, slime, or unusual odor |
| Black water | Approved dump station and tank-flush equipment | Persistent odor, slow drainage, inaccurate level readings, or solids buildup |
| Gray water | Dump after black water; rinse the sewer hose; use compatible treatments | Sour odor, slow drainage, gurgling, or drain residue |
Once the tanks are clean, service the parts that move water through the system.
Turn off pump power and relieve pressure before cleaning the strainer as directed. Inspect its bowl, gasket, and wiring, then reassemble, prime if needed, and test the pump.
Remove faucet aerators and showerheads. Clean them with a descaling method approved for the fixture material, then rinse thoroughly before reinstalling. Check that the toilet seal holds water, and replace worn seals with matching parts.
For a tank water heater, shut off gas and electrical heat and let it cool fully. Turn off the water supply and open a hot-water faucet to relieve pressure before removing the drain plug or anode rod. Drain the tank, flush out sediment, and inspect those parts according to the manual.
Refill the tank completely and purge air through a hot-water faucet before restoring heat. For tankless units, follow the manufacturer’s flushing steps. Leave gas service to a qualified technician.
After routine service, winterize your RV before the first hard freeze. Finish before temperatures reach 32°F, rather than following a fixed calendar date. Utah’s higher elevations can freeze before the Salt Lake Valley. Check overnight lows at your storage site, along mountain routes, and at overnight stops - not just at home.
Drain all remaining water from the tanks, low-point drains, and fixtures. Remove or bypass filters, and set the water heater bypass according to the manual. Don’t miss the outdoor shower, toilet valve, pump, or water-connected appliances, if equipped.
Follow your manual’s method: compressed air, antifreeze, or both. When using compressed air, connect a regulated blowout adapter and stay below the lowest pressure limit listed for the plumbing system and connected appliances. Where required, pump RV/marine plumbing antifreeze rated for expected storage temperatures through every required hot- and cold-water outlet. Protect drain traps as directed. Never use automotive antifreeze, and don’t dilute the product unless its label allows it.
Keep a winterization record with the RV. Note the date, antifreeze brand and quantity, removed filters, and drain positions. Take photos of bypass valves and pump connections.
Before using the RV after storage, reverse the winterization steps. Inspect the plumbing for cracks or damage. Keep the water heater bypassed while flushing out antifreeze, and dispose of the antifreeze according to its label and local wastewater rules. Sanitize the fresh-water system, reinstall or replace filters, and return all valves to their operating positions before use.
Pressurize the plumbing and check for leaks. If you find damage, shut off the water supply. Fill the water heater completely and confirm steady, air-free flow from a hot-water faucet before turning the heat back on. Heating an empty electric tank can damage its element.
Use this checklist to stay on top of RV plumbing maintenance, with a focus on leaks, sanitation, and winterizing.
Keep a dated maintenance log with your RV manual and update it after every service. Set service intervals based on manufacturer guidance, water quality, climate, and how often you use your RV.
| Task | Timing | Done |
|---|---|---|
| Inspect hoses, fittings, and seals; pressurize the plumbing and check for leaks | Before every trip | ☐ |
| Check fixtures, toilet seals, pump function, and tank connections | During each trip | ☐ |
| Empty and rinse gray and black tanks at an approved dump station | During use; before storage | ☐ |
| Sanitize the fresh-water tank and lines | At least annually; after contamination or months of nonuse | ☐ |
| Service the water heater; inspect the anode rod if equipped | Manufacturer-specified interval | ☐ |
| Drain and winterize the plumbing | Before freezing weather | ☐ |
| Flush, sanitize, and pressure-test the plumbing | After storage, before use | ☐ |
Treat persistent moisture as a leak. Shut off the pump and city water, then dry accessible areas. If water reaches walls or flooring, get help from a qualified RV service provider.
Disconnect your RV from external water sources, then pressurize the plumbing system. If the water pump cycles on and off while all faucets are closed, a plumbing leak is more likely than condensation. Shut off the main water supply and check connections near fixtures and under cabinets for moisture.
If you can’t find the source, Dent Master Collision can help locate and fix RV plumbing issues.
The information provided doesn’t explain why RV water might smell after sanitizing. If the odor or plumbing problems continue, contact a technician who works on RV systems.
Dent Master Collision in Lehi, Utah, handles RV repairs, including plumbing and structural components.
Yes - even a brief freeze is reason to winterize your RV’s plumbing. This helps protect pipes, tanks, and water lines from freeze damage. Dent Master Collision recommends winterizing to help prevent leaks and costly damage when temperatures drop below freezing.
