The Right Way to Drain & Sanitize an RV Fresh Water Tank
Ever wondered if the water in your RV’s fresh water tank is really fresh?
Imagine arriving at your dream campsite, only to find your RV water smells like plastic, (or worse). Avoid this RV nightmare by learning how to properly drain and clean your fresh water tank.
When you go on an RV vacation with your family, the last thing you want to deal with is a water tank issue. A contaminated or poorly maintained fresh water tank can lead to foul-smelling water, low water pressure, or even bacterial contamination that can make you sick. To avoid water tank problems, it's important to keep your RV's fresh water tank clean and free of contaminants, and the best way to do that is by draining it regularly.
In this article, we'll not only walk you through the process step-by-step but also provide RV tank troubleshooting tips, expert recommendations, and sanitization methods beyond bleach to ensure your water stays safe and fresh.
What is an RV Fresh Water Tank?
Every RV has a fresh water tank and waste holding tank that stores water for drinking, cooking, and bathing.
Most camper water tanks are between 30 and 60 gallons, and the size of the tank will determine how long you can go without needing to refill it. Fresh water tanks are typically made from polyethylene plastic, and over time, water sitting in the tank can absorb plastic odors if not properly maintained.
To fill the tank, you'll need to connect a hose to a water source. Once the fresh water tank is full, proper maintenance is essential to prevent bacterial growth and sediment buildup. One way to do this is to regularly drain the RV tank and flush it with fresh water.
Types of RV Fresh Water Tanks
Not all RV fresh water tanks are the same. Some key variations include:
- Plastic (polyethylene) tanks: Most common in RVs, durable but can develop odors.
- Aluminum tanks: Found in older or high-end RVs, resistant to corrosion but heavier.
- Size variations: Small trailers may have 10-20 gallon tanks, while larger motorhomes can carry 100+ gallons.
How Long Can Water Sit in a Fresh Water Tank Before It Becomes Contaminated?
As any experienced RVer knows, it's important to regularly drain and clean out the fresh water tank. Stagnant water can harbor bacteria like Legionella, which thrives in warm, stagnant water and can cause respiratory illnesses.
In addition, water sitting in a plastic tank for too long can take on a chemical or plastic-like taste due to leaching.
So how often should you drain your water tank?
When & How Often Should You Drain Your RV Fresh Water Tank?
How often should you drain your RV water tank? The general rule of thumb is that RV water will stay fresh in the tank for about two weeks if you aren’t refilling it regularly. It depends on usage and conditions since bacteria may grow faster in hotter climates:
Troubleshooting Common Water Issues
If your water tastes off or you notice low water pressure, consider these fixes:
- Strange odors or tastes? This is a sign of bacterial growth. Flush with a baking soda solution or use an inline water filter.
- Low water pressure? Your pump or pipes may be clogged—flush the system.
- Tank leaks? Inspect for cracks and use a sealant or replace the your rv water tank.
- Algae growth? Sanitize more frequently, especially if storing water for long periods. In worst case scenarios, call a professional to help get it cleaned or replace the tank.
- Drain Valve Stuck or Slow: Try gently wiggling it or applying RV-safe lubricant. If it’s still stuck, consult an RV technician. A slow drain can be due to sediment buildup; flushing the tank can help. Ensure the RV is level to facilitate complete drainage.
- No more water flowing? Immediately turn off the water pump to prevent it from burning out. Running the pump dry can cause severe damage, leading to costly repairs or replacement.
If you’re experiencing persistent water issues or need assistance with RV tank installation, replacement, or repairs, we recommend consulting a licensed plumber or a specialized RV dealer. They have the expertise to ensure proper installation and maintenance, helping you avoid costly damage or system failures.
Does Tank Depot Offer RV Tank Installation or Repair Services?
No, Tank Depot does not provide RV tank installation or repair services. We specialize in supplying high-quality RV water tanks and accessories. For installation or repairs, we recommend reaching out to a certified plumber or an RV service professional.
Steps to Properly Drain Your Fresh Water Tank
If you're like most RVers, your fresh water tank doesn't occupy your mind until it's time to fill it up. But if you don't properly maintain your RV fresh water tank, it can become a breeding ground for bacteria and algae. That’s why it’s crucial to drain and flush it regularly.
Tools You’ll Need
Before you start, gather these supplies:
- An adjustable wrench (for removing drain plugs)
- A bucket or garden hose to direct water flow
- A sanitizing solution (bleach or vinegar)
- A water filter (optional but recommended)
- RV water pump
- Gloves
Here is your checklist to drain your RV fresh water tank:
Step 1: Turn Off the Water Supply & Heater
Before draining the fresh water system, turn off the water heater, the main supply valve, and the water pump. This prevents new water from entering the tank. Make sure your heater holding tank has cooled down before proceeding.
Step 2: Flush the Toilet & Open Faucets
Flush the toilet until water stops coming out. Then, open all the faucets in your RV, including any outdoor showers, to help drain the water faster.
Step 3: Locate & Open the Drain Valve
Most RVs have “low-point drains” located underneath the vehicle. These can be identified by their red and blue color coding (hot and cold respectively). Open these valves or unscrew the small plastic caps to start draining.
Tip: Check your RV manual for exact valve locations, as these can vary by model.
Step 4: Use the Water Pump to Speed Up the Process
Turn on your RV's pump to help push water out of the system faster. Continue draining until the water slows to a trickle.
Step 5: Flush the Tank with Fresh Water
Turn off the pump and open the main supply valve to let fresh water into the tank. Refill your camper’s tank slightly with clean water, then drain again. This flushing process helps remove sediment and debris that may have accumulated in the tank.
How long should you flush? Flush until you see clear water running from all faucets, which usually takes about 5-10 minutes depending on your tank size and water pressure.
Step 6: Drain the Water Heater
Unscrew the drain plug on your water heater and let it empty completely. Replace the plug once drained.
Step 7: Close the Valves & Refill the Tank
Once the system is drained, close all valves and refill the tank with clean, potable water.
Top Tips to Keep Your Fresh Water Tank Clean Between Drains
Keeping the RV camper’s tank sanitized regularly ensures that the water you store in it remains clean.
Sanitizing with Bleach
- Pour ¼ cup of bleach per 15 gallons of tank capacity. Be precise with the bleach-to-water ratio so as not to damage the tank and plumbing system, or leave a strong odor.
- Fill the fresh water tank completely with water.
- Let it sit for 8-12 hours to effectively sanitize the tank and plumbing lines.
- Drain the system and flush with clean water until the bleach smell disappears.
Alternative Sanitization Methods
Are there alternatives to bleach in sanitizing your RV fresh water tank? Yes! They include:
- Vinegar & Water: Mix 1:1 ratio and let it sit for several hours before draining, although this is a milder cleaning agent and may not be as effective as bleach.
Commercial RV Sanitizers: Pre-made solutions designed specifically for RVs. These tend to be less harsh on your system if instructions are followed correctly.
Have You Noticed Sediment in Your RV Fresh Water Tank? Let’s Discuss!
What are your go-to methods for keeping your RV’s fresh water tank clean?
Additional RV Water Tank Maintenance Tips
- Winterizing: If storing your RV for the winter, drain the tank completely to prevent freezing and damage.
- Use a Filter: An inline water filter removes debris and improves water quality right from the source, thereby reducing the frequency of deep cleaning.
- Inspect Regularly: Check for cracks, leaks, or mold growth inside your tank.
If you're looking for a new fresh water tank for your RV, Tank Depot offers durable, high-quality RV fresh water and RV waste holding tanks in various sizes. We also provide accessories like valves, fittings, and filters.
Visit our website today to browse our selection and place your order. We'll ship your new RV tank right to your door, so you can get back on the road in no time! Contact us today for more information.
