Can You Put Antifreeze In Rv Holding Tanks

Can You Put Antifreeze in RV Holding Tanks

Many RV owners wonder if it is safe to put antifreeze in their RV holding tanks during the winter months. The answer is no, you should not put antifreeze directly into your RV holding tanks.

Why Not?

The reason you should not put antifreeze in your RV holding tanks is because it can be harmful to the environment. RV holding tanks are designed to hold waste and should only contain biodegradable waste and approved chemicals.

Antifreeze is a chemical that is toxic and can contaminate the soil and water supply if it is not disposed of properly. It is also harmful to humans and animals if ingested. Therefore, it is important to handle and dispose of antifreeze properly.

So, What Should You Do Instead?

Instead of putting antifreeze in your RV holding tanks, there are a few other steps you can take to winterize your RV and prevent your holding tanks from freezing.

1. Drain And Flush The Tanks

The first step is to drain and flush the tanks completely. Start by emptying your black and gray water tanks at an appropriate dumping station. Make sure to follow all local regulations and guidelines for proper waste disposal.

Next, flush the tanks with clean water to remove any remaining waste. Repeat this process until the water runs clear.

2. Add Rv Antifreeze

Instead of putting antifreeze in your holding tanks, you can add RV antifreeze to the plumbing system. This will help protect your pipes, faucets, and other plumbing components from freezing during the winter.

Follow the instructions on the RV antifreeze bottle to ensure you use the correct amount for your specific RV. It is important to use RV antifreeze specifically designed for this purpose, as it is non-toxic and safe for your plumbing system.

3. Protect External Plumbing

In addition to adding RV antifreeze to the plumbing system, it is also important to protect any external plumbing components from freezing. This includes disconnecting and draining exterior hoses, as well as insulating any exposed pipes.

4. Keep The Rv Warm

Lastly, it is important to keep your RV warm during the winter months. This can be done by insulating the windows, doors, and any other areas where cold air can enter. You can also use portable heaters or RV-specific heating systems to maintain a warm temperature inside the RV.

Frequently Asked Questions On Can You Put Antifreeze In Rv Holding Tanks

Can I Put Antifreeze In My Rv’s Holding Tank?

Yes, you can safely put antifreeze in your RV’s holding tank to prevent freezing during winter storage.

Is It Safe To Use Regular Antifreeze In An Rv Holding Tank?

Using regular antifreeze in an RV holding tank is not recommended as it contains toxic chemicals. Instead, use RV-specific antifreeze for the best results.

How Does Antifreeze Help Prevent Damage To Rv Holding Tanks?

Antifreeze creates a protective barrier inside the RV holding tanks, preventing them from freezing and cracking during cold temperatures.

What Type Of Antifreeze Is Best For Rv Holding Tanks?

The best type of antifreeze for RV holding tanks is non-toxic, propylene glycol-based antifreeze specifically formulated for RV use.

Can I Use Antifreeze In My Rv’s Fresh Water Tank?

It is not advisable to put antifreeze in your RV’s fresh water tank as it can be difficult to completely flush out, affecting the taste and safety of your drinking water.


In conclusion, putting antifreeze directly into your RV holding tanks is not recommended due to its potential harm to the environment and living beings. Instead, take the necessary steps to drain and flush your tanks properly, add RV antifreeze to your plumbing system, protect external plumbing, and keep your RV warm during the winter. By following these precautions, you can ensure your RV stays in good condition and prevent damage caused by freezing temperatures.

Leave a Comment