5 Best Greywater Tanks For RV Living Without Hookups That Support Self-Reliance
Stay off-grid longer with the right tank.
You found the perfect boondocking spot. The view is incredible, the solitude is absolute, but your greywater tank is full. Now you face a choice: pack up and drive miles to a dump station, or break the "Leave No Trace" principle. This is the moment every off-grid RVer dreads, and it’s the single biggest factor that cuts a trip short.
Managing your greywater is the key to unlocking true self-reliance. It’s not just about plumbing; it’s about freedom. Your ability to contain and manage used water from your sinks and shower directly translates into how long you can stay disconnected from civilization, enjoying the places you traveled so far to see.
Choosing the right greywater tank—whether it’s a permanent upgrade or a portable ally—is one of the most impactful decisions you can make for your off-grid setup. It’s not about finding a one-size-fits-all solution, but about matching the right tool to your specific travel style. This choice dictates whether you’re tethered to dump stations or truly free to roam.
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Extend Your Boondocking with These Greywater Tanks
Your greywater tank is the unsung hero of extended off-grid stays. When your freshwater tank is the gas pedal, your greywater tank is the brake. Upgrading your capacity is the most direct way to give yourself more time in the wild before needing to find services.
There are two primary paths to increasing your greywater capacity: installing a larger permanent tank or carrying a portable "tote" tank. A permanent tank is an integrated solution, ideal for full-timers or those doing major renovations who can design around it. A portable tank is a flexible, powerful tool that allows you to empty your main tanks in place, effectively doubling or tripling your stay without moving your rig.
Ultimately, the goal is to create a system that removes your water capacity as a limiting factor. Many seasoned boondockers use a combination of both—a decently sized permanent tank for daily use and a portable tote for long-term stays. This hybrid approach offers the best of both worlds: integrated convenience and flexible, on-demand capacity.
RecPro RV Gray Water Tank: The Versatile Choice
This combo pack includes 30 and 42-gallon BPA-free fresh and gray water holding tanks, made in America and NSF approved. Featuring durable construction with 2" inlets and 1/2" NPT outlets, these tanks are pressure tested for reliability.
When it comes to replacing or upgrading your RV’s built-in tank, RecPro is a name you’ll see everywhere. They specialize in high-quality, blank polyethylene tanks in a staggering array of sizes and dimensions. This makes them a fantastic choice for retrofits, as you can almost always find a size that fits your available space.
The real strength of these tanks lies in their construction. Made from seamless, rotationally molded polyethylene, they are immune to rust and corrosion. This one-piece design means there are no seams to fail, which is a critical feature for a tank that will be vibrating and flexing down backroads.
The key thing to understand about RecPro tanks is that they are a blank canvas. They typically ship without any fittings installed, which is both a pro and a con. It means you have complete control over where your inlet, outlet, and vent ports go, but it also means you’ll need the tools and confidence to drill into your new tank and install the fittings yourself.
Valterra RV Holding Tank: Built for Durability
Easily clear clogged RV sewer tanks and pipes with the Valterra Flush King. Its 45-degree reverse flush valve attachment features a clear body to confirm when tanks are clean and a leak-proof bayonet connection for reliable use.
If you’re looking for a more plug-and-play solution, Valterra is a brand with a long-standing reputation for durable, reliable RV plumbing components. Their holding tanks are often made from tough ABS plastic, a material known for its rigidity and impact resistance. This makes them an excellent choice for under-mount applications where the tank is exposed to potential road debris.
Unlike the blank-slate approach of many other manufacturers, many Valterra tanks come with pre-installed fittings. This can dramatically simplify the installation process, as you won’t need to purchase and install spin-weld fittings yourself. You simply connect your plumbing to the existing ports, secure the tank, and you’re done.
The trade-off for this convenience is a lack of customization. You are locked into the port locations that the manufacturer decided on, which might not be ideal for a custom build or a tight retrofit. For a standard RV repair or a straightforward upgrade, however, Valterra’s robust build and pre-fitted design make it a top contender.
Class A Customs: Your Custom-Fit Tank Solution
For anyone building a van, skoolie, or other custom rig, Class A Customs is an invaluable resource. They offer an enormous variety of tank shapes and sizes, including many unconventional dimensions that are perfect for tucking into odd corners. This is where you find the tank that fits perfectly over a wheel well or slides into a narrow bay, maximizing every cubic inch of your build.
Their focus on the DIY and conversion market means you can find a tank to match almost any design constraint. This ability to optimize space is crucial in small living. Instead of designing your layout around a standard tank, you can find a tank that fits your ideal layout, which is a subtle but powerful shift in the design process.
Like RecPro, these are typically blank polyethylene tanks, giving you full control over plumbing placement. This is essential for custom builds where plumbing runs are unique. Choosing a Class A Customs tank is a commitment to a more hands-on installation, but the payoff is a perfectly integrated system that doesn’t waste an inch of precious space.
Camco Rhino Tote Tank: Your Portable Waste Ally
Easily transport RV waste to a dump station with Camco's durable 36-gallon tote tank. It features heavy-duty, no-flat wheels and a built-in gate valve for convenient emptying and cleaning.
The Camco Rhino is arguably the most recognizable portable waste tank on the market, and for good reason. It’s a rugged, no-nonsense solution for emptying your holding tanks without moving your RV. For the boondocker parked in a perfect spot for two weeks, the Rhino is the tool that makes it possible.
Its design is focused on practical use. The large, heavy-duty wheels are designed to roll over gravel and uneven ground, and the durable, blow-molded construction can handle the bumps and scrapes of transport. Most kits come with everything you need, including hoses and fittings, making it a complete, ready-to-use system right out of the box.
Using a tote tank is a physical task, and the Rhino is built to make that task as manageable as possible. A full 36-gallon tank can weigh over 300 pounds, so features like an integrated tow handle are essential. It’s the workhorse of the portable tank world, designed for function over form.
Barker Tote Tank: The Easiest Portable Dump
Easily transport waste with the Barker 42-gallon tote tank. Its front-swivel, double-wheel design ensures smooth rolling and effortless maneuvering.
If the Camco Rhino is the workhorse, the Barker Tote Tank is the refined thoroughbred. Barker has been in the business for a long time, and their designs reflect decades of user feedback. Their standout feature is the use of large, pneumatic tires on their bigger models, which is a game-changer.
Those air-filled tires make a world of difference when towing a heavy tank across anything other than smooth pavement. They absorb shock and roll over obstacles like rocks and roots with far less effort than solid plastic wheels. If your typical dump station run involves crossing a bumpy field or a long gravel road, the extra cost for a Barker can be easily justified by the reduced physical strain.
Barker tanks are also known for their quality construction and streamlined, low-profile designs that make them easier to fill and pull. It’s a premium product with a premium price tag, but it represents a significant upgrade in user experience. For full-timers or serious boondockers who use a tote tank regularly, the Barker is often considered a worthwhile investment in convenience.
How to Choose Your Ideal RV Greywater Tank
The first and most important question to ask is: Are you replacing/upgrading a permanent tank, or are you adding supplemental, portable capacity? Your answer immediately narrows the field. If you need a permanent tank, you’re looking at brands like RecPro, Valterra, or Class A Customs. If you need to extend your stay without moving, you’re in the market for a portable tote from Camco or Barker.
Once you know which type you need, you can drill down into the specifics. Use these points as your guide:
- Capacity: How much do you realistically need? Track your water usage for a few days. A common conservative estimate is 10-15 gallons per person, per day.
- Dimensions & Space: For permanent tanks, this is everything. Measure the available space meticulously before you even start shopping. For totes, consider where you’ll store it during travel.
- Material: For permanent tanks, choose between the flexibility of polyethylene (RecPro, Class A) and the rigidity of ABS (Valterra), depending on the mounting location.
- Installation: Be honest about your DIY skills. Do you want the customization of a blank tank, or the simplicity of pre-installed fittings?
There is no single "best" tank, only the best tank for your situation. A 60-gallon permanent tank is useless if your travel style requires you to stay put for weeks at a time. Conversely, relying solely on a small portable tote can become a daily chore. The ideal solution is a system that matches your water consumption and your preferred way of travel.
Your Greywater Questions Answered by an Expert
One of the first questions new boondockers ask is, "Can I just dump my greywater on the ground?" The answer is almost always no. While it may seem harmless—it’s just soap and water, right?—it can contain phosphates, bacteria, and food particles that disrupt local ecosystems and attract pests. Always follow Leave No Trace principles and local regulations, which generally require you to pack out everything you pack in.
So, how big of a tank do you need? Instead of relying on generic online calculators, do a real-world test. Fill your freshwater tank, go on a typical weekend trip, and see how quickly you fill your greywater tank. This is your personal usage rate. That number is worth more than any estimate because it’s based on your habits, from washing dishes to taking showers.
Finally, preventing odors is simple maintenance. Use a quality sink strainer to keep food solids out of the tank—that’s the number one cause of bad smells. Use a greywater-specific tank treatment to break down soap scum and prevent bacteria from building up. A little prevention goes a long way in keeping your system clean and odor-free.
This stainless steel sink strainer effectively prevents clogs with its 0.08-inch drain pores, while the double-layer design protects hands from sharp edges. Its 4.5-inch outer diameter fits most kitchen sinks and is easy to install and clean.
Mastering your water systems is the final frontier of RV self-reliance. It’s the invisible infrastructure that dictates the rhythm of your life on the road. Choosing the right greywater tank isn’t just a technical upgrade; it’s a strategic decision that buys you time, freedom, and more nights under starry, unobstructed skies.
Whether you opt for a larger integrated tank that seamlessly extends your range or a rugged portable tote that serves as your off-grid lifeline, you are actively designing a more resilient travel style. You’re moving from being dependent on hookups to being capable of thriving without them.
Ultimately, the goal is to make your holding tanks an afterthought, not a constant worry. A well-chosen system allows you to focus on the experience of being out there, confident in the knowledge that you have the capacity to stay a little longer. That is the true essence of living untethered.
