Shop Freshwater Storage Tanks at West Marine
Whether you're upgrading an older water system or outfitting a new boat, a reliable freshwater storage tank is essential. West Marine offers a wide selection of rigid polyethylene tanks and flexible bladder-style tanks to meet the needs of weekend boaters and bluewater cruisers alike.
Rigid vs. Flexible Freshwater Tanks
Rigid tanks are made from FDA-approved polyethylene and are ideal for fixed installations. They're available in multiple shapes and sizes, designed to meet U.S. Coast Guard requirements for potable water storage. Flexible tanks, on the other hand, are made from nitrile or PVC and are easier to install in tight or irregularly shaped compartments. They’re popular among cruisers looking to expand water capacity without major structural modifications.
Choosing the Right Tank
Freshwater tank capacity should reflect your onboard needs. West Marine carries tanks from 13 to 55 gallons. Consider your tank space, number of people onboard, and how long you typically spend away from shore-based water supplies. Flexible tanks offer installation flexibility, while rigid tanks provide long-term durability and shape retention.
Accessories for Water System Installations
To simplify setup, West Marine also offers plumbing accessories like hose relocation kits, fill and vent fittings, and pipe-to-hose adapters. These allow you to customize tank placement and plumbing runs to suit your boat's layout. With the right fittings and a freshwater pump, you’ll enjoy a smooth, reliable water delivery system.
For more information, see our West Advisor article on Pressurized Freshwater Systems to understand how tanks, pumps, hoses, and faucets all work together to deliver clean water onboard.
Freshwater Storage Tanks FAQ
Rigid tanks hold their shape and are made of polyethylene, while flexible tanks are collapsible bladders made of PVC or nitrile. Flexible tanks are ideal for tight spaces or secondary water storage.
Yes. All rigid tanks sold at West Marine are made from FDA-approved polyethylene suitable for potable water. Flexible tanks are lined to resist odors and maintain water quality.
It depends on the number of people onboard and your time away from dockside water. A weekend cruiser might use 10–20 gallons per day, while liveaboards or long-distance cruisers may need larger tanks or multiple tanks onboard.
Yes. Flexible tanks are suitable for permanent or temporary use. They’re especially popular on sailboats and ocean cruisers for their ease of installation and ability to conform to irregular spaces.
Yes. All freshwater tanks should be vented to prevent vacuum pressure buildup during pump operation and to allow proper filling and draining. Most tanks have a designated vent port.
Yes. Many boaters install tanks themselves using hose relocation kits, hose clamps, and a freshwater pump. Be sure to secure tanks properly and use potable water hose for all plumbing connections.
Most installations use fill fittings, vent fittings, and pipe-to-hose adapters. Hose relocation kits can help move inlets or outlets to more convenient locations on your boat.
Use freshwater tank cleaners or a diluted bleach solution, then flush thoroughly. Clean at least once per season or more frequently if the water becomes stale or discolored.
Not directly. Pressure is created by a freshwater pump connected to the tank. When a faucet is opened, the pump activates and draws water from the tank to deliver pressurized flow.
Yes. Many cruisers install multiple tanks plumbed together or routed through selector valves. This allows for better weight distribution and the ability to isolate tanks for service or balance.
