Adding an RV holding tank at home can feel like a big project, but it can also open up a world of convenience, whether you’re a weekend warrior or a full-time RVer. Imagine setting off with fresh water and waste storage ready to go, no last-minute stops necessary.
With this guide, you’ll learn the basics of selecting and installing holding tanks yourself. From knowing which tools to use to connecting your tanks safely at home, we’ll cover every step.
Why Holding Tanks Matter for Your RV
For RV owners, holding tanks are the unsung heroes of road trips. They store everything you need and keep unwanted smells and waste contained. Freshwater tanks make it possible to shower, cook, and drink clean water on the go. Gray and black tanks collect wastewater and toilet waste, making life on the road just a little more civilized. Adding these tanks or even replacing old ones can be done at home, allowing you to avoid pricey service fees.
Key Types of Holding Tanks
Depending on your camping style and RV setup, you’ll need to choose between three types of tanks:
- Freshwater Tank: For clean water you’ll use for drinking, showering, and cooking.
- Gray Water Tank: Holds used water from sinks and showers.
- Black Water Tank: Stores waste from the toilet.
If you’re camping in the wild or boondocking often, having a solid gray and black water setup can give you the freedom to roam further without stopping at a dump station.
Safety Note: Handle Your Plumbing with Care
If you’re thinking of connecting your RV to a home septic system, be cautious: incorrect connections or tank placements can damage your home plumbing. Never connect a black or gray tank line into your drain field, as the high volume could clog it and lead to costly repairs. Always consult a septic specialist if you’re unsure.
What You’ll Need to Get Started
Tools & Materials
Before you get started, gather these essentials:
- Holding tanks (fresh, gray, black, depending on your needs)
- Water pump (for pressurized freshwater)
- Mounting hardware (brackets, straps)
- Wrench set and screwdriver
- Plumbing components (hoses, clamps, fittings)
If you’ve ever installed a home plumbing system, you’ll be a few steps ahead, but if not, don’t worry. This project is more about steady hands than advanced skills.
Choosing the Right Tank
Holding tanks are typically made from durable materials like ABS plastic or polyethylene. Your tank choice depends on your needs and budget. Here’s a quick guide:
- ABS Tanks: Great for budget-conscious RVers; these tanks are tough and easy to install.
- Polyethylene Tanks: Often more durable and lighter, which can be ideal for boondocking or extended travel.
For sizing, consider your usage. A 10- to 30-gallon freshwater tank works well for short trips, while black and gray tanks should be large enough to hold waste for at least a week.
Step-by-Step Installation Guide
Step 1 – Plan Your Installation
Sketch a Diagram
Grab a piece of paper and draw out your RV’s layout. Mark out where you want each tank. These marks will be your guide as you install each component.
Consider Plumbing Routes
Each tank will connect to different fixtures. Make sure your freshwater tank is accessible to sinks, showers, and your toilet. The gray tank should be positioned near sinks and showers, while the black tank sits directly under the toilet.
Step 2 – Select the Installation Site
Freshwater Tank Placement
Place the freshwater tank close to major water fixtures to minimize hose length and pressure loss. For easy filling, consider an exterior spot accessible from outside the RV.
Gray and Black Tanks
Gray tanks should be located directly under sinks or showers, while the black tank should ideally sit beneath the toilet. Ensuring each tank is close to its respective fixture will help reduce installation complications and leaks.
Step 3 – Install the Water Pump (for Freshwater)
Pump Setup
To set up a pressurized freshwater system, install a water pump between your freshwater tank and fixtures. Follow the manufacturer’s guidelines for wiring, and make sure you’re using the right gauge wire to prevent power issues. I’ve learned that skipping this step or guessing on wiring can lead to inconsistent water flow!
Step 4 – Securely Mount the Holding Tanks
Installation Tips
Black and gray tanks need reinforced support. Mount them on brackets or straps rated for the weight of a full tank. A client once used generic straps, only to find that road vibrations can be brutal on holding tanks. We replaced them with reinforced, adjustable brackets.
Mounting Hardware
Secure the tanks with metal fittings, and avoid plastic fasteners, as they can wear down and crack. For added security, double-check all connections and fittings before use.
Hooking Up to Home Systems
Here’s a quick guide from Greg Out and About with some information:
Option 1 – Connect to Septic System
Best Practices
When connecting your RV tanks to a septic system, install the line between your house and septic tank, not the drain field. A licensed plumber or septic specialist can help make sure everything connects safely.
Proper Angle for Dumping
Use a slight slope (½ inch drop per foot of piping) to ensure waste flows smoothly. A steeper slope can separate liquids from solids, causing clogs over time.
Avoid Septic Damage
Dumping waste into the drain field can overwhelm the system. Adding an RV dump line after the septic tank but before the leach field will eventually cause buildup, leading to possible damage and replacement.
Option 2 – Direct Dump into Septic Tank
Direct Connection Setup
For a more direct setup, connect your RV’s black or gray water hose directly into the top of the septic tank. This method is ideal for seasonal or rare dumps, but for frequent use, connecting before the baffle is preferable.
Temporary vs. Frequent Use
For regular RV users, connecting between the house and tank is a safer, long-term solution. Occasional dumpers can safely connect after the baffle but need to ensure waste flows perpendicular to prevent clogging.
Frequently Asked Questions
Can I empty my black water tank at home?
Yes, but only if you have a proper septic setup. Dumping into a sewer line is ideal, but make sure it doesn’t flow into the drain field.
How do I hook up my RV to my home septic tank?
Follow the guidelines above, but if in doubt, consult a professional. Damage to your septic system can be costly and inconvenient.
What’s the best way to fill my water tank while boondocking?
Carry portable water containers or invest in a manual water pump to refill tanks on the go. Some RVers keep a collapsible water bladder for added water storage during extended trips.
Can I use household cleaners like Pine-Sol in RV tanks?
Avoid harsh cleaners that can harm seals and tank surfaces. Use RV-safe, biodegradable cleaners to avoid damage and reduce environmental impact.
Maintenance Tips for Your New Setup
Regular Checks
Check tanks periodically for any signs of leaks or cracks. Look for rust or signs of movement, especially if you drive on rough terrain frequently.
Winterizing
Drain tanks completely and use antifreeze if you plan to store your RV in cold conditions. Frozen tanks can crack, leading to expensive repairs come spring.
Common Issues & Repairs
Blockages are common and can usually be cleared with a simple enzyme-based treatment or manual cleaning. For odor control, invest in an RV tank deodorizer to keep things fresh.
Enjoy the Freedom of a DIY RV Holding Tank Setup
Adding an RV holding tank at home is a manageable DIY project that saves you time and money on the road. Having your tank setup ready means more flexibility in planning trips and more time enjoying the outdoors. And if you need expert advice, TX RV Repair Shop is here to help make sure your setup is smooth and secure.
With these steps, you’ll be prepared to hit the road with a solid and dependable holding tank setup, making your adventures as clean and convenient as they should be. Safe travels!