How to Fill an RV Fresh Water Tank


The freshwater system in an RV allows you to store and use water while you are on the road or staying in an area where a water hook-up is not available. Water stored in the freshwater tank is delivered to the plumbing system via a 12-volt water pump that is powered by the RV’s battery. Frequent sanitization is recommended to discourage the buildup of bacteria. Proper use and sanitization of the freshwater system ensures that your freshwater tank can provide clean and safe drinking water regardless of your location.

Things You'll Need

  • Potable water hose
  • Locate the fill spout for the freshwater tank. Look for a white spout with a white cap. It is typically near other connections on the side of the RV and may be behind a small locked door.

  • Remove the fill spout cap. There are two types of caps — one that unscrews and one that lifts up. If the cap unscrews and is not attached to the spout, place it in a safe place while you are filling the tank.

  • Unscrew the vent plug and place it in a clean area. Your vent plug may snap into place. This type can be removed by gently pulling in an upward motion.

  • Connect a clean potable water hose to a nearby faucet. Briefly run water through the hose to remove any dirt or debris.

  • Insert the hose into the fill spout and begin filling the tank. If you will be traveling, you may wish to limit the amount of water in the freshwater tank to avoid towing excess weight.

  • Monitor the water level and remove the hose from the fill spout once the tank has been filled to the desired level.

  • Replace the vent plug and ensure that it is secure. Rinse the water fill spout cap and replace to prevent contamination of the tank or water.

Tips & Warnings

  • Always use a clean potable water hose to avoid contamination and prevent the water from developing a bad taste. Thoroughly drain the hose after each use to prevent the growth of algae. Coil the hose and screw the ends together to prevent it from being contaminated with dirt or insects during storage.
  • The fresh water tank should be sanitized before the first use and after being stored for an extended period of time. The tank can be sanitized with a solution of household bleach or chlorinating concentrate.
  • Always fill the tank with clean water from a safe source. If the water has a foul odor or unusual color, empty and sanitize the tank before refilling.

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