Reliable black water tanks keep your RV sanitary and hassle-free. These six options fit a range of floorplans and maintenance needs.
Built from MDPE or HDPE with low-adhesion interiors, they clean up fast and last longer. Check outlet size, venting, mounting, and full-tank weight before selecting one.
| Class A Customs 40 Gallon RV Waste Black Water Holding Tank WT-4000 |
| Best Capacity Pick | Capacity: 40 gallons | Intended Use: RV waste/gray water holding tank | Material: Medium Density Polyethylene (MDPE) resin | VIEW LATEST PRICE | Read Our Analysis |
| RecPro 33 Gallon RV Black Wastewater Holding Tank |
| Built-to-Code Reliability | Capacity: 33 gallons | Intended Use: RV black waste water holding tank | Material: High-Density Polyethylene (HDPE) | VIEW LATEST PRICE | Read Our Analysis |
| RecPro 30 Gallon RV Black Water Holding Tank |
| Low-Profile Durable | Capacity: 30 gallons | Intended Use: RV black water holding tank | Material: Polyethylene (rotomolded) | VIEW LATEST PRICE | Read Our Analysis |
| 30 Gallon RV Portable Waste Tank 2 Wheel Tote Tank |
| Best Portable Option | Capacity: 30 gallons (portable tote) | Intended Use: Portable RV waste tote tank (black water) | Material: High-Density Polyethylene (HDPE) | VIEW LATEST PRICE | Read Our Analysis |
| RecPro 29 Gallon RV Water Holding Tank (Right-Side) |
| Custom-Fit Design | Capacity: 29 gallons | Intended Use: RV black/gray water holding tank | Material: Polyethylene (rotomolded) | VIEW LATEST PRICE | Read Our Analysis |
| classAcustoms 31-Gallon Black RV Waste Holding Tank |
| Compact Performance | Capacity: 31 gallons | Intended Use: RV waste/gray water holding tank | Material: Medium Density Polyethylene (MDPE) | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
Class A Customs 40 Gallon RV Waste Black Water Holding Tank WT-4000
Should you want a tough, reliable black water tank for an RV, the Class A Customs 40 Gallon WT-4000 fits the bill and works well for campers, trailers, and tiny houses. You’ll appreciate its MDPE construction and US manufacturing as you install it. Note the fixed 3″ ABS female outlet, so you’ll run ABS or PVC piping and add a dump valve downstream. You won’t get inlet, vent, fittings, mounting hardware, or valve included, so plan ahead. Don’t over-tighten fittings or pressurize the tank. Venting is essential, and you’ll decide inlet and vent locations during installation.
- Capacity:40 gallons
- Intended Use:RV waste/gray water holding tank
- Material:Medium Density Polyethylene (MDPE) resin
- Made In / Origin:Made in USA
- Outlet / Drain Connection:3″ ABS female outlet (molded, fixed)
- Fittings/Accessories Not Included (user-supplied):Inlet/vent fittings, piping, dump valve, mounting hardware not included
- Additional Feature:3″ ABS female outlet
- Additional Feature:MDPE resin construction
- Additional Feature:User-determined inlet/vent
RecPro 33 Gallon RV Black Wastewater Holding Tank
Who is this tank best for? You should consider it when you need a reliable, mid size black tank for your camper, trailer, or RV. You’ll like the RecPro 33 Gallon RV Black Wastewater Holding Tank because it’s made in America and fits many setups. It’s blow molded from HDPE with uniform wall thickness, so it stands up better than some rotational molded or thermoformed tanks. You get a 3 inch coupling and dimensions of 22″ across 54″ across 8″ for easy installation. Built to IAPMO and Canadian Standards Association specs, it integrates cleanly into your RV plumbing and gives peace of mind.
- Capacity:33 gallons
- Intended Use:RV black waste water holding tank
- Material:High-Density Polyethylene (HDPE)
- Made In / Origin:Made in America
- Outlet / Drain Connection:3″ coupling
- Fittings/Accessories Not Included (user-supplied):Fittings not included (integral tank only)
- Additional Feature:Blow-molded HDPE
- Additional Feature:Uniform wall thickness
- Additional Feature:IAPMO & CSA built
RecPro 30 Gallon RV Black Water Holding Tank
Should you want a reliable, budget-friendly black water tank that fits mid-size RVs, the RecPro 30 gallon holding tank is a smart pick. You get a 30 gallon rectangular tank that measures 54 across 22 across 8 inches and weighs about 20 pounds. It’s rotomolded from high density polyethylene, so it feels solid and won’t crack on the road. The low adhesion surface helps whenever you clean it, and you’ll appreciate that it’s made in the USA. Installers like its shape for tight spaces, and owners praise the durability, simple maintenance, and straightforward fit.
- Capacity:30 gallons
- Intended Use:RV black water holding tank
- Material:Polyethylene (rotomolded)
- Made In / Origin:Made in USA
- Outlet / Drain Connection:(Standard rotomolded tank; 3″ coupling implied) — dimensions list and typical 3″ connection
- Fittings/Accessories Not Included (user-supplied):Fittings/accessories not included (tank only)
- Additional Feature:Low-adhesion finish
- Additional Feature:Rotomolded construction
- Additional Feature:20 lb item weight
30 Gallon RV Portable Waste Tank 2 Wheel Tote Tank
In case you live full time in an RV, boondock often, or travel to parks without sewer hookups, this 30 gallon 2-wheel tote tank is the kind of gear that will make life easier and less stressful. You’ll appreciate the ready kit that includes hoses, clear elbows, rinse adapters, caps with lanyards, and a tow bar. The solid rubber wheels and 22-inch tow bar let you roll or tow it behind a cart. Gate valves and smooth interior make emptying and cleaning simple. HDPE construction stands up to sun and wear. It clamps to a ladder for neat storage.
- Capacity:30 gallons (portable tote)
- Intended Use:Portable RV waste tote tank (black water)
- Material:High-Density Polyethylene (HDPE)
- Made In / Origin:(Not explicitly stated) — kit marketed for RV use; likely domestic manufacture not specified
- Outlet / Drain Connection:Gate valve with included sewer hose and swivel bayonet/lug fittings (portable tote connections)
- Fittings/Accessories Not Included (user-supplied):Some accessories included (hose, adapters, caps, tow bar) — additional mounting hardware not included
- Additional Feature:Two-wheel suitcase tow
- Additional Feature:Complete accessory kit
- Additional Feature:Integrated tank rinser
RecPro 29 Gallon RV Water Holding Tank (Right-Side)
In case you want an RV black water tank that feels built to last and is easy to maintain, the RecPro 29 gallon right-side tank fits that need like a glove. You’ll appreciate its 60″ x 24″ x 7″ profile that hides neatly under RV floors and holds 29 gallons for longer trips. It’s rotomolded polyethylene made in USA, so it resists cracks and won’t cling to waste thanks to a low adhesion finish. You get a right-hand side drain with a 1″ lip and IAPMO and QAI certifications. Fittings aren’t included, so you can pick parts that match your rig.
- Capacity:29 gallons
- Intended Use:RV black/gray water holding tank
- Material:Polyethylene (rotomolded)
- Made In / Origin:Made in USA
- Outlet / Drain Connection:Right-side drain with 1″ lip (user-supplied fittings)
- Fittings/Accessories Not Included (user-supplied):Fittings not included (allows customization)
- Additional Feature:Right-side drain orientation
- Additional Feature:1″ lip at drain
- Additional Feature:QAI certified
classAcustoms 31-Gallon Black RV Waste Holding Tank
Should you want a sturdy, no-nonsense waste tank for a Class A motorhome, the classAcustoms 31-gallon black tank fits the bill. You’ll get a US made MDPE tank built for waste and gray water, with a fixed 3″ ABS female outlet molded in. You should plan inlet and vent locations yourself, and add fittings, piping, a dump valve, and mounting hardware. Don’t use it for drinking water and don’t pressurize it. Venting is essential so it breathes during use. Be careful not to overtighten fittings, as that can crack the polyethylene or ABS outlet and cause leaks.
- Capacity:31 gallons
- Intended Use:RV waste/gray water holding tank
- Material:Medium Density Polyethylene (MDPE)
- Made In / Origin:Made in USA
- Outlet / Drain Connection:3″ ABS female outlet (molded, fixed)
- Fittings/Accessories Not Included (user-supplied):Inlet/vent fittings, piping, dump valve, mounting hardware not included
- Additional Feature:Molded 3″ ABS outlet
- Additional Feature:Black MDPE resin
- Additional Feature:Fixed outlet (non-moveable)
Factors to Consider When Choosing Rv Black Water Tanks
While you’re picking an RV black water tank, you’ll want to weigh capacity and size against the space you have and how long you plan to boondock. Look at material and durability, outlet and plumbing compatibility, venting needs, and mounting fitment so the tank will last and install without surprises. I’ll walk you through each point clearly so you can make a confident choice that fits your rig and lifestyle.
Capacity And Size
Pick a tank size that matches how you live on the road and how long you usually travel, because that choice will quiet a lot of stress and avoid surprise dump stops. You want capacity based on your normal waste volume and trip length. Tanks commonly run 20 to 40+ gallons, and bigger tanks mean fewer dumps. Measure available undercarriage or compartment space, checking length, width, depth, and plumbing clearances so the tank fits right. Keep in mind weight: one gallon adds about 8.34 pounds when full, so don’t overload payload or axles. Should your layout need it, use multiple or compartmentalized tanks to balance weight left to right. Plan ahead for longer trips or more people and choose slightly larger capacity than you need now.
Material And Durability
Consider material and durability ahead of time, because the tank you select will determine how trouble-free your trips feel. You’ll want polyethylene like HDPE or MDPE or rotomolded plastic since they resist corrosion, chemicals, and UV far better than metal. Look for uniform wall thickness and solid molding methods such as rotational or blow molding because consistent walls cut warping, cracking, and impact damage.
Also check interior finish; a smooth, low-adhesion surface keeps waste from sticking and makes cleaning and odor control easier. Ponder about weight and reinforcement next because heavier, thicker tanks last longer but need stronger mounts. Finally inspect fittings and molded outlets to verify they’re integral and sturdy, avoiding thin or brittle connection points that stress crack or leak.
Outlet And Plumbing
Match your black water tank outlet to your RV plumbing so installation stays simple and leak-free. You’ll want to confirm outlet type and size, usually 3 inch or 1 inch, so it fits your sewer piping or needs a simple adapter. Check the molded outlet location and orientation next because some outlets are fixed and can force awkward routing. Plan a short run of compatible ABS or PVC between the tank outlet and your dump valve since dump valves rarely connect directly to molded outlets. Use properly sized couplings and avoid over-tightening threaded fittings or clamps to prevent cracking plastic. Also include a dedicated vent and correctly sized vent piping in your layout to avoid slow draining and vacuum lock whenever you empty the tank.
Venting Requirements
Because vents let air move freely as the tank fills and empties, you’ll want a clear plan for venting your RV’s black water tank that keeps drains fast and odors out of the coach. You need vents sized to plumbing code, commonly one inch or larger, so air can enter without creating vacuum or pressure that slows drainage. Route vent lines above the tank’s highest water level to stop backflow and smells. Run vents to the exterior and finish with screened or capped terminations to keep insects and debris out while letting gases escape. Whenever you install vents, avoid sharp bends, long horizontal runs, and tight fittings that add resistance and cut performance. Good venting keeps drains quiet and reduces odor inside your RV.
Mounting And Fitment
Now that you’ve planned venting to keep odors out, you’ll want the black tank itself to sit right and stay secure for the long haul. Measure the available space in length, width, and height, and compare it to the tank’s external dimensions so it clears brackets, frame rails, and nearby parts. Check that inlet, outlet, and vent locations align with your plumbing or can be routed without awkward bends. Make sure the outlet type and diameter match your fittings or that you can add adaptor piping without stressing the molded outlet. Plan strong mounting points and hardware that spread the full weight to avoid stress cracks. Leave clear access around the tank for inspection, service, or future removal.
Cleaning And Maintenance
Regularly caring for your black water tank will keep your RV smelling fresh and working right, and you’ll thank yourself on the road. You should flush tanks with fresh water and a rinser or built-in sprayer after each full use to dilute solids and cut odor buildup. Use enzyme or bacterial treatments as the label directs, usually weekly or after dumping, so waste breaks down and clogs don’t form. Inspect outlet couplings, seals, and the dump valve after every emptying, and swap out worn gaskets to stop leaks and smells. Periodically fill the tank partway and scrub corners and baffles with a sanitary brush or low-pressure rinse, then rinse until clear. Keep vents working and avoid harsh chemicals that kill helpful bacteria.
Certification And Standards
As you’re picking a black water tank, choosing one that’s built to recognized standards gives you real peace of mind and saves headaches later. You want tanks certified to IAPMO or CSA so materials, fittings, and performance meet industry rules. Certification means tests covered material compatibility, structural strength, leak resistance, and consistent manufacturing. That helps the tank live through many fill and drain cycles and temperature swings. Standards also spell out acceptable resins and wall thickness like HDPE or rotomolded construction so cracks and deformation stay rare. Certified tanks often get chemical resistance and low-adhesion surface testing which makes cleaning easier and cuts odors. Finally, a standards-compliant tank can simplify code compliance, inspections, and warranty claims.
Portability And Accessories
Consider how you’ll move and store your black tank before you buy one, because portability and the accessories that come with it can make life a lot easier. You’ll weigh capacity against weight when full, since bigger tanks hold more but can be hard to lift or tow. Decide whether a fixed tank or a portable tote fits your habits, because totes with wheels and tow bars make trips to the dump station simpler. Check included hoses, swivel fittings, gate valves, rinse adapters, and storage caps so hookups and cleaning go smoothly. Look for handles, ladder hooks, low profiles, or suitcase-style tow bars to fit your vehicle and storage. Finally, pick UV-resistant high-density plastic and solid rubber wheels for durability and easy rolling outdoors.
