Plumbing lines can be exposed to dirt and foreign matter from minerals in the water. Faucets are designed with strainers in the aerators to catch debris, but over time a build up can cause faucet washers to wear and create dripping at the faucet. Drips can quickly reduce fresh water reserves while dry camping. A constant drip can also produce staining inside a sink or shower basin. Repair a dripping faucet by first shutting off the water at the valve. Remove the faucet stem, change the washer, and reinstall the stem. Replace the washer with the same type and size.

Polish plumbing fixtures with a soft cloth to prevent water spotting. Avoid abrasive cleaners that can scratch the finish. For stubborn stains, clean fixtures using a sponge dampened with a mild liquid detergent and warm water solution, rinse with clear water, and dry with a soft cloth.

Avoid pouring foods or grease down drains to prevent clogs. You may be able to clear a clog using a plunger. If you attempt to open a clog using a chemical agent, make sure the substance is safe for RV use, and follow package directions carefully to avoid personal injury or damage to the plumbing system. To help reduce the possibility of odor emitting from the pipes, occasionally run water into each drain to fill the bends in the pipes, known as P-traps.

To keep the toilet from backing up, use tissue recommended for RV use. Do not use the toilet to dispose of domestic items such as disposable diapers, excess amounts of toilet paper, sanitary supplies, Q-tips, dental floss or children's toys. Keep the black tank closed until it reaches half full. While traveling, pour ice cubes into the black tank to help loosen solid build up while the RV is moving down the road.

Constant running of the water pump when faucets are not in use may indicate the presence of a leak. Water leaks inside the RV can create costly damage. Take immediate steps to pinpoint the leak by inspecting pipes under the sinks, and floor surfaces around the toilet and shower for any signs of moisture. If the water pump fails to operate, check to confirm that the battery cut off switch has not been disengaged, and if so, that the breaker has not tripped. The water pump system includes a screen to filter large debris from the fresh water tank. Clean this screen annually.

Keep at least two water pressure regulators on hand, one to use at hook up and the other as a spare. The RV water system is designed to operate at certain water pressure levels. Occasionally, water connections at home or in a campground may exceed this pressure and can cause leaks to develop. A water pressure regulator can control the incoming water supply, keeping pressure with the parameters regulated to the RV water pipes. Some campgrounds require the use of a water pressure regulator at all campsites.