A Quick Guide On How to Fill a Water Tank in an RV

A Quick Guide On How to Fill a Water Tank in an RV

Key Takeaways
● Learning how to fill the water tank in an RV is relatively straightforward.
● Acquire supplies such as a water hose, filter, and pressure regulator to fill the tank safely.
● Use an external source like a spigot or holding tank to fill the RV’s fresh water tank.

If you’re an RV owner, you know that one of the most important things to keep your vehicle running is having a full water tank. But how do you go about filling it up?

The primary step in filling your RV’s fresh water tank is to prepare the tank and supplies needed, such as a hose, water pressure regulator and filter. Once it’s ready, you can start filling up the tank.

This blog will go over more detailed information that will help you fill your water tank quickly and easily. From step-by-step instructions to tips for choosing the right supplies and advice for maintaining your tank so it lasts longer – let’s get started!

Importance of Filling an RV Water Tank

Importance of Filling an RV Water Tank

Access to a reliable water supply is key to comfortable and enjoyable travels. Having a full water tank in your RV is important for more than just keeping you hydrated. It also plays an integral role in OTHER aspects of your travels.

A full water tank will PROVIDE you with ample hot water for showering, washing dishes, and doing laundry if you have that capability.

If not, having a full tank ensures enough water to properly rinse surfaces and items that need CLEANING while on the go.

Access to hot or cold running water can be a lifesaver when CAMPING in remote areas without hookups.

Additionally, having a full water tank means having extra weight in the rig, which helps keep it BALANCED during travel on rough terrain. This will help maintain a comfortable drive for you and your passengers.

Essential Supplies for Filling an RV Water Tank

Essential Supplies for Filling an RV Water Tank

Before you begin filling the tank, it’s essential to make sure that you have all of the necessary supplies. A fresh water hose, a pressure regulator and a filter are essential for ensuring clean and safe water.

Water Hose

The type of hose you get should be LONG enough to reach from your source of water (like a spigot or hydrant) to your RV. It should also be made from DURABLE and flexible materials such as rubber or PVC, as this will help reduce wear and tear over time.

Additionally, it’s best to choose one that is lead-free and NSF-certified for drinking water use to protect your HEALTH better and ensure cleanliness.

Pressure Regulator

If the area you’re filling the tank has a high-pressure water supply, it’s recommended to use a pressure regulator [1].

This will help keep the water flow at an ACCEPTABLE rate and protect your RV’s pipes from excessive pressure. It will also reduce the risk of bursting any hoses or fixtures due to high pressure.


Lastly, you’ll want to install a filter on your hose to remove sediment and other particles before they get into the tank. This will help keep the water CLEAN and reduce the risk of damage to the tank, hoses, and other components.

This filter should be changed regularly to ensure optimal FILTRATION and a safe drinking water supply for your RV [2].

Pro Tip: Use a filter with a replaceable cartridge to save you money in the long run.

Step-By-Step Instructions for Filling a Water Tank in an RV

Step-By-Step Instructions for Filling a Water Tank in an RV

Now that you have all your supplies ready, it’s time to start filling up the tank. Here are a few easy steps to follow:

Step 1: Attach Hose to Water Source

Once your supplies are ready, attach one end of the hose to a safe water source, like a spigot or hydrant. Ensure it is TIGHTLY secured, so there are no leaks in the line during filling.

Step 2: Connect the Pressure Regulator (If Applicable)

As mentioned, if the area you’re filling the tank has a high-pressure water supply, it’s recommended to use a pressure regulator. Connect it to the hose BETWEEN the water source and your RV.

Step 3: Attach Filter

Attach the filter to the end of the hose going into your RV. This will help keep sediment and other particles out of your tank to reduce DAMAGE to hoses and fixtures.

Step 4: Connect Hose to RV

Connect the opposite end of the hose securely to your RV’s intake valve. Make sure there are no LEAKS before proceeding with filling.

Step 5: Turn On Water Supply

Once all connections have been made, OPEN up the water supply at its source (like a spigot or hydrant).

Step 6: Monitor Flow and Fill Tank

Monitor the flow of water while filling your RV tank. When it has reached its desired level, turn off the water supply at its source and disconnect the hose from your RV. Make sure to close all valves TIGHTLY to prevent any leaks.

Step 7: Disconnect Hose and Clean Up

When you’re done filling the tank, disconnect the hose from both ends (the RV and the water source) before storing it away.

Do a FINAL check for leaks or damages on both hoses, filters and pressure regulators before putting them away for subsequent use. Finally, clean up any spilled water around where you filled your tank.

Pro Tip: Ensure to properly drain and store your hose when it’s not in use.

Tips for Maintaining a Healthy and Clean RV Water Tank

Tips for Maintaining a Healthy and Clean RV Water Tank

Now that you know how to fill an RV water tank, here are a few tips for keeping it healthy and clean:

Inspect Regularly

Ensure that all hoses, fixtures, pipes and valves that are CONNECTED to the grey water tank are in good condition. Look for signs of leakage, wear and tear and other damages.

Use High-Quality Supplies

Whenever buying supplies for your water tank (hoses, filters, regulators), make sure they are NSF-certified for drinking water use and made from DURABLE materials such as rubber or PVC.

Change Filter Regularly

The filter should be changed OFTEN according to the manufacturer’s instructions to ensure optimal filtration and cleanliness of your water supply.

Clean Tank Regularly

It’s essential to clean your water tank REGULARLY. This can be done by draining out all the old water, opening the inspection ports and cleaning them with a mild soap solution.

Use Additives

If you’re storing your RV for an extended period, it’s recommended to use additives such as chlorine or hydrogen peroxide to help keep the water FRESH.

Check Water Source Quality

Before filling your tank, check the water source you’re using for any CONTAMINANTS or bacteria present in the water.

Monitor Pressure

Check and adjust pressure regulators while filling your tank to maintain a SAFE pressure level suitable for your RV.

If you suffer from low water pressure, check with your local city water supply for their recommended water pressure levels.

Store Hoses Properly

When you’re done filling, disconnect the hoses and store them PROPERLY in a dry place away from direct sunlight or extreme temperatures to prevent deterioration.

Add Sanitizer

To help keep your tank and plumbing system clean, add sanitizing PRODUCTS such as chlorine tablets or biodegradable camp soaps at least every two weeks when using your freshwater tank regularly.

Bleed Out Air

After filling the tank, it’s important to bleed out any trapped air in the lines, which can cause pressure changes and DECREASE the performance of pumps or fixtures while using them.

Pro Tip: Make sure to follow the manufacturer’s instructions when adding sanitizers and other additives, as they can affect pressure levels inside your tank.

Frequently Asked Questions

Frequently Asked Questions

How Often Should I Clean my RV Fresh Water Tank?

It’s recommended that you clean your tank at least once every couple of months or more if stored for an extended time.

What Should I Use to Clean My RV Fresh Water Tank?

Use a mild soap solution or other specialty cleaning products specifically designed for tanks and plumbing systems when cleaning your tank.

Can I Fill an RV Water Tank With Tap Water?

Yes, you can fill an RV water tank with tap water in most cases. However, make sure to check the source of water for any contaminants or bacteria present in the water before filling it up.

Should I Open All Valves While Filling My Tank?

No, only open the valves necessary for filling your tank. Always close all valves tightly to prevent any leaks.



Now that you know how to fill an RV fresh water tank, you’re ready to hit the open road.

Remember to follow our tips and advice for choosing the right supplies and maintaining your tank. And always check your water source for any contaminants or bacteria before filling.

With these steps, you can ensure that your RV will have a safe and reliable supply of clean water while on the road.

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Picture of Lisa Hayden-Matthews

Lisa Hayden-Matthews

An avid Skier, bike rider, triathlon enthusiast, amateurish beach volleyball player and nature lover who has never lost a dare! I manage the overall Editorial section for the magazine here and occasionally chip in with my own nature photographs, when required.
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