Choosing the right 30 gallon RV water tank is essential for reliable freshwater or gray water storage on the road. This guide highlights five top options, covering fresh and gray water tanks as well as combination and under-mount designs. Each pick is evaluated for build quality, compatibility, and practical features to help you compare options quickly.
| Product | Brand | Use Case |
|---|---|---|
| 30 Gallon Fresh/Gray Water Tank 34" x 18" x 12" | A.A | Fresh/Gray water |
| classAcustoms | One 30 Gallon Tank | classAcustoms | Fresh/Gray water, versatile orientation |
| Class A Customs | Under Mount 30 Gallon RV Concession Tank | classAcustoms | Under-mount, Fresh/Gray water |
| classAcustoms | RV Fresh and Gray Water Tank Combo Pack | classAcustoms | Combination 30 gal & 40 gal |
| Ameri-Kart 30 Gallon RV Black Water Tank | Ameri-Kart | Black water waste storage |
30 Gallon Fresh/Gray Water Tank — A.A
The 30 gallon water tank from A.A measures 34″ by 18″ by 12″ (excluding fittings) and is designed for non-pressurized use with venting. This single-piece seamless construction minimizes the risk of leaks and burst points. Included fittings include a 1.25″ water fill inlet and three 3/8″ NPT connections. The tank’s seamless design and venting requirement suit RV fresh or gray water storage where a robust, simple system is preferred.
Key features include a BPA-free construction and a durable, leak-resistant profile suitable for permanent or semi-permanent installations. The combination of a wide inlet and multiple NPT connections supports flexible plumbing layouts. As with any non-pressurized tank, plan for venting to prevent pressure buildup. Compatibility with standard RV fittings simplifies retrofits for current RV setups.
classAcustoms — One 30 Gallon Tank
This 30-gallon tank by Class A Customs is suitable for fresh or gray water storage and is built from NSF-approved materials. It supports multiple orientations (the tank can sit on any side) and includes built-in fittings: two 1.5″ female NPT fittings and two 0.5″ female NPT fittings. Dimensions are approximately 34.5″ long by 12″ high by 17.5″ deep, with an average wall thickness around 7/32″. The design advises removing an inner membrane before use and emphasizes careful handling of threaded fittings to avoid damage.
Designed for flexibility, this model caters to RVers who want a sturdy, non-pressurized tank that can be rotated to fit space constraints. The inclusion of multiple built-in fittings reduces the need for extra adapters. As with all non-pressurized tanks, proper venting and careful assembly are essential to prevent leaks and ensure safe operation.
Class A Customs — Under Mount 30 Gallon RV Concession Tank
The UM-3000 under-mount model from Class A Customs offers a 30-gallon capacity designed for RVs with a focus on under-mount installation. The tank’s dimensions are 48″ long (excluding fittings) by 8.5″ high by 13″ deep, with a similar thickness profile to other Class A Customs tanks. It includes two 1.5″ female NPT fittings and two 0.5″ female NPT fittings. The tank is suitable for fresh or gray water and emphasizes a vented, non-pressurized setup to prevent pressure-related issues.
For RVers seeking a system that fits around cabinetry or under-seat areas, this model provides a compact footprint with a long, low profile. The dual FPT fittings enable straightforward plumbing, while the included guidance highlights the importance of not over-tightening fittings to avoid damage. A versatile option for custom installs where space is a premium.
classAcustoms | RV Fresh And Gray Water Tank Combo Pack
This combo pack includes one 30-gallon and one 40-gallon tank, both suitable for fresh or gray water using NSF-approved materials. The non-pressurized tanks require venting and should not be connected directly to a garden hose in a pressurized manner. Each tank features built-in fittings: two 1.5″ female NPT fittings and two 0.5″ female NPT fittings. You can use the two different sizes to create a flexible plumbing layout, and the notes emphasize careful handling to maintain seal integrity.
The pack provides a scalable solution for RV owners who expect varying storage needs or who want to prepare additional capacity for longer trips. The emphasis on vented, non-pressurized operation helps ensure safety and durability in typical RV environments.
Ameri-Kart — 30 Gallon RV Black Water Tank
Ameri-Kart’s 30-gallon black water tank is designed for waste storage in RVs, motorhomes, trailers, and similar vehicles. It features a 3″ end discharge outlet, with inlet and vent positions configurable by the user during installation. The tank uses weather- and impact-resistant plastics and is built to withstand RV operating conditions. Optional sensor probes may indicate water level, helping crews monitor waste storage. The design emphasizes leak prevention and long service life, aligning with IAPMO standards for reliable performance.
Buying Guide: Key Considerations For 30 Gallon RV Water Tanks
- Tank type and compatibility: Fresh/gray water tanks are non-pressurized and vented; black water tanks are designed for waste with different discharge considerations. Confirm whether you need a fresh/gray water tank, a gravity-fed combo, or a dedicated waste tank for your RV.
- Fit and mounting: Consider dimensions, mounting orientation (under-mount, surface-mounted, or free-standing), and space constraints in your RV. Look for tanks that can sit on multiple sides or have flexible orientation to fit tight compartments.
- Fittings and connections: Check built-in fittings (1.5″ or 0.5″ NPT, etc.) and the need for adapters. Ensure the fittings are watertight and that you understand whether membranes must be removed before use.
- Material and safety: NSF approval and BPA-free materials are indicators of safe drinking water storage. For waste tanks, choose plastics designed for chemical resistance and durability in RV environments.
- Ventilation and non-pressurized operation: Most RV tanks require venting to prevent pressure buildup. Avoid direct garden hose connections to sealed systems to prevent ruptures.
- Warranty and standards: Look for manufacturers that advertise compliance with industry standards (IAPMO, NSF) and provide clear installation guidance and warranty coverage.
- Kit completeness: Some products include accessories like tank rinser, ladders hooks, or transport kits. A complete kit can reduce the need for additional purchases.
- Maintenance: Consider ease of cleaning, interior surface smoothness, and availability of cleaning accessories to simplify routine maintenance on long trips.
- Price-to-value: Compare the total capacity, built-in fittings, and mounting options across models. A slightly higher price may reflect better fittings, longer life, or greater installation flexibility.