RV Tanks
Custom RV Water Tanks
Fresh Water RV Tanks Built to Your Dimensions
Custom RV water tanks from Water Storage Tank keep fresh water flowing wherever your rig goes—whether you’re outfitting a new coach, replacing a cracked OEM tank, or building a custom van conversion. Each RV fresh water tank is rotomolded from potable-grade polyethylene, sized to your footprint, and fitted exactly where your plumbing needs it. We work with RV manufacturers, repair shops, and serious DIY builders to deliver durable, leak-resistant RV water tanks that install cleanly and perform for years on the road.
Looking for water storage solutions? We can help! Call us at 1-863-261-8388 or contact us to discuss your needs.
Why Choose a Custom RV Fresh Water Tank?
A custom RV water tank lets you keep the footprint you need without compromising capacity or plumbing layout. Whether you’re replacing a failed OEM RV fresh water tank or designing a new build, our tanks are engineered for long-term service in real road conditions.
- Built for RV duty: Rotomolded polyethylene RV water tanks resist cracking, vibration, and road shock.
- Potable water safe: Food-grade, NSF/FDA-compliant resin helps protect drinking water quality when used as directed.
- Custom fittings: Inlets, outlets, vents, and drains are spin-welded where your plumbing needs them, reducing field work.
- Easy replacement: Match the general size of an existing RV fresh water tank while improving material and design.
- Support from spec to install: Our team reviews dimensions, fittings, and use conditions before you buy.
How to Get a Quote for a Custom RV Water Tank
To quote a custom RV water tank or a replacement RV fresh water tank, we’ll ask for a few key details. Having these ready up front speeds up drawings, pricing, and lead time.
- Overall dimensions: Length, width, and height of the available space, plus orientation (which side faces forward).
- Target capacity: Desired gallons, or “match existing tank” if you’re replacing one.
- Fitting locations: Approximate locations and sizes for fill, outlet, vent, drain, and any inspection ports.
- Use type: Fresh potable water (this page) vs. gray/black water (see our RV holding tanks page).
- Reference info: Any OEM part numbers, sketches, photos of the existing RV water tank, or plumbing layout.
Send this information with your quote request and we’ll confirm fitment, suggest improvements if needed, and provide current pricing and lead time before you commit.
Example RV Water Tank Sizes
Every RV build is different, but these example fresh water tank sizes show the range we commonly supply. Use them as a starting point when planning your layout; we’ll finalize dimensions to fit your space and capacity requirements.
| Example Application | Approximate Capacity (Gallons) | Typical Footprint (L × W × H) | Notes |
|---|---|---|---|
| Small camper / van conversion | 20–30 gal | 36" × 14" × 10" (example) | Compact RV water tank for basic kitchen and handwashing. |
| Mid-size travel trailer | 35–55 gal | 40" × 20" × 12" (example) | Common replacement RV fresh water tank size for couples’ coaches. |
| Large fifth wheel / motorhome | 70–100+ gal | 48" × 26" × 16" (example) | Higher-capacity potable water storage for extended off-grid stays. |
| Custom toy hauler / specialty build | As required | Built to available bay dimensions | We design the RV tank around your cargo, axles, and weight distribution. |
Who Uses Our RV Water Tanks?
RV Manufacturers & Upfitters
OEM builders and upfitters rely on custom RV fresh water tanks when standard off-the-shelf tanks don’t fit the available space. We can build repeatable, labeled tanks for production lines, with port locations that match your plumbing drawings.
RV Repair Shops & Service Centers
Cracked or leaking RV water storage tanks are a common repair. We supply replacement RV water tanks that match the general size and function of the original, often in stronger polyethylene with upgraded fittings to reduce callbacks.
Custom Van, Skoolie & Tiny Home Builders
Conversion builders need potable water storage that fits tight, odd spaces—over wheel wells, under beds, or in cabinetry. Custom RV tanks let you maximize gallons while keeping weight and access where they make sense for your layout.
Serious DIY RV Owners
If you’re re-plumbing an older rig, adding boondocking capacity, or building a one-off adventure vehicle, a custom RV water tank gives you the flexibility to design your system once and avoid future headaches.
Do you have questions? We can help! Call us at 1-863-270-8118 or contact us to discuss your needs.
Engineering Details & Materials
Behind every RV water tank is a set of engineering decisions that affect long-term performance. We design each tank with materials and wall thickness appropriate for RV use so you don’t have to guess.
- Material: Rotomolded HDPE polyethylene, suitable for fresh potable water when used as directed.
- Construction: Seamless, one-piece design reduces risk of leaks at seams or joints.
- Wall thickness: Selected for RV service to balance strength, weight, and cost.
- Fittings: Spin-welded or bulkhead fittings installed in-house for inlets, outlets, vents, and drains.
- Temperature range: Designed for typical RV operating temperatures; optional insulation strategies available at the system level.
- Compatibility: Works with standard RV pumps, filters, and plumbing when sized and installed correctly.
Need gray or black water storage as well? Pair your fresh water tank with a matching RV holding tank built from the same durable materials.
RV Water Tank FAQs
Can you match my existing RV fresh water tank?
In most cases we can build a replacement RV water tank that closely matches your existing capacity and footprint. Photos, measurements, and any visible part numbers are helpful. We’ll review clearances, fittings, and support points before quoting to avoid surprises during install.
Are your RV water tanks safe for drinking water?
Our RV fresh water tanks are manufactured from potable-grade polyethylene resin that meets FDA/NSF requirements for contact with drinking water when used as directed. Always follow best practices for sanitizing and maintaining your RV water system.
Do you also build gray and black RV holding tanks?
Yes. In addition to fresh water tanks, we supply custom gray water and black water RV holding tanks with appropriate fittings and venting. Visit our RV holding tanks page or include your waste tank needs with your quote request.
What information do you need to start a custom RV tank?
At minimum we need your target capacity, available space (L × W × H), tank orientation, and a basic sketch of where fittings should be located. If you’re replacing an OEM tank, measurements and photos of the old tank and plumbing help speed things up.
Can I drill new holes or move fittings after I receive the tank?
We strongly recommend having fittings installed at the factory to maintain structural integrity and leak resistance. If you must add fittings in the field, use components designed for polyethylene and follow the manufacturer’s installation instructions carefully.
What is the typical lead time for a custom RV water tank?
Lead times vary with season and complexity, but most custom RV water tanks ship in a few weeks once drawings are approved. When you request a quote, we’ll provide a current lead time estimate along with pricing.
Do you provide drawings before building my tank?
For custom RV tanks, we can provide a dimensional drawing or approval sketch showing overall size and fitting locations. This lets you review clearances with your team and avoid conflicts with frames, axles, and other components.
Can these RV water tanks be used in off-grid cabins or tiny homes?
Yes. Many customers use our RV-style potable water tanks in cabins, tiny homes, and mobile offices where space is limited and RV plumbing components are already in use. Let us know your installation details so we can recommend a suitable configuration.
Looking for water storage solutions? We can help! Call us at 1-863-261-8388 or contact us to discuss your needs.