Marine Water Tanks

These NSF and FDA compliant marine water storage tanks are made to be incredibly strong, nearly unbreakable, and are very affordable. Plastic marine water tanks (poly) are available in nearly every size and shape. Made from one piece of thick poly, there are no seams so less opportunity for leaking, and made with a rotomold process for superior strength. You won’t find better-made marine fresh water tanks for the price. 

Made from one piece to form 3/8” thick walls using a roto-mold process to create a seamless holding tank superior in strength and performance. These custom fitted marine water tanks are built to go the distance.   

*Note: Customize the placement of the fittings when you place the order.  We spin-weld the fittings to ensure your holding tank is securely connected to your plumbing.

  • Complies with NSF 61, FDA Reg CFR 177.1520, and Coast Guard Standards
  • Made from virgin polyethylene (poly) resins
  • Seamless tank made from one piece (less likely to break or leak)
  • 3/8” thick tank walls
  • Customized fitting placement
  • Spin weld fittings
  • Outlasts the competition

For use as marine water tanks, marine fresh water tanks, plastic marine water tanks, poly marine water tanks, custom marine water tanks, and more!

We have 100’s of sizes ranging from 2 gallons, 40 gallons, 50 gallons, 100 gallon marine water tanks.  They range in size up to 250 gallons for these poly marine fresh water tanks.

Looking for something else? Chances are, we have it, and at affordable prices too!  Just call us and ask!

Pick the size and shape you need from the list. Mark up the drawing with your fittings placement. Call us with any questions!

Marine Water Tanks

  • An image of a 8 Gallon Marine Fresh Water Tank | B360

    10 Gallon Marine Fresh Water Tank | B323

    The 10 Gallon Marine Fresh Water Tank by One Clarion is a rectangular-shaped portable tank that is designed for above ground use. This tank is made of polyethylene material and comes in a natural white color. It measures 32 inches in length, 19 1/2...

    $203.77
    Add to Cart
  • An image of a 25 Gallon RV Fresh Water Tank | RVB408

    10 Gallon Marine Fresh Water Tank | B290

    Introducing the 10 Gallon Marine Fresh Water Tank by One Clarion. This portable tank is perfect for marine enthusiasts looking to create a fresh water environment for their aquatic pets. With a rectangular shape and a capacity of 10 gallons, this tank...

    $261.29
    Add to Cart
  • An image of a 16 Gallon Marine Holding Tank | B106

    10 Gallon Marine Fresh Water Tank | B278

    Introducing the 10 Gallon Marine Fresh Water Tank by One Clarion. This portable tank is specifically designed for marine environments and is perfect for above ground use. With its rectangular shape, it offers a space-saving solution for storing and...

    $227.17
    Add to Cart
  • An image of a 22 Gallon Marine Fresh Water Tank | B134

    10 Gallon Marine Fresh Water Tank | B263

    The 10 Gallon Marine Fresh Water Tank by One Clarion is a rectangular-shaped portable tank that is designed for above ground use. This tank is made of polyethylene material and comes in a natural white color. It measures 15 3/8" in length, 13 1/4" in...

    $192.07
    Add to Cart
  • An image of a 27 Gallon PE Ronco White Rectangular Open Top Tank | 24X12X24PE

    10 Gallon Marine Fresh Water Tank | B217

    Introducing the 10 Gallon Marine Fresh Water Tank by One Clarion. This portable tank is perfect for marine enthusiasts looking to create a fresh water environment for their aquatic pets. With its rectangular shape and above ground usability, this tank...

    $204.74
    Add to Cart
  • Image of a 10 Gallon Trionic Marine Fresh Water Tank

    10 Gallon Trionic Marine Fresh Water Tank | WH-2010

    Introducing the 10 Gallon Trionic Marine Fresh Water Tank by One Clarion. This marine water tank is designed with a rectangular shape, making it easy to fit into any space. Its portable usability allows for convenient transportation, perfect for those on...

    $263.24
    Add to Cart
  • 10 Gallon Marine Water Tank MW-53. Technical drawing of a polyethylene water tank designed for marine vessels.

    10 Gallon Marine Water Tank MW-53

    This tank ships in 6-8 weeks. Custom fitting placement is not available at this time. It can be ordered blank, or blank with a DIY Fitting Kit Custom Roto-Mold 10 Gallon Marine Water Tank, Part# MW-53, is engineered to meet the requirements of mobile...

    MSRP: $182.89
    $168.82
    Add to Cart
  • 10 Gallon Marine Water Tank MW-490. Technical drawing of a polyethylene water tank designed for marine vessels.

    10 Gallon Marine Water Tank MW-490

    This tank ships in 6-8 weeks. Custom fitting placement is not available at this time. It can be ordered blank, or blank with a DIY Fitting Kit Custom Roto-Mold 10 Gallon Marine Water Tank, Part# MW-490, is engineered to meet the requirements of mobile...

    MSRP: $220.52
    $203.56
    Add to Cart
  • 10 Gallon Marine Water Tank MW-431. Technical drawing of a polyethylene water tank designed for marine vessels.

    10 Gallon Marine Water Tank MW-431

    This tank ships in 6-8 weeks. Custom fitting placement is not available at this time. It can be ordered blank, or blank with a DIY Fitting Kit Custom Roto-Mold 10 Gallon Marine Water Tank, Part# MW-431, is engineered to meet the requirements of mobile...

    MSRP: $242.87
    $224.19
    Add to Cart
  • 10 Gallon Marine Water Tank MW-376

    This tank ships in 6-8 weeks. Custom fitting placement is not available at this time. It can be ordered blank, or blank with a DIY Fitting Kit Custom Roto-Mold 10 Gallon Marine Water Tank, Part# MW-376, is engineered to meet the requirements of mobile...

    MSRP: $280.61
    $259.03
    Add to Cart
  • 10 Gallon Marine Water Tank MW-358. Technical drawing of a polyethylene water tank designed for marine vessels.

    10 Gallon Marine Water Tank MW-358

    This tank ships in 6-8 weeks. Custom fitting placement is not available at this time. It can be ordered blank, or blank with a DIY Fitting Kit Custom Roto-Mold 10 Gallon Marine Water Tank, Part# MW-358, is engineered to meet the requirements of mobile...

    MSRP: $174.36
    $160.94
    Add to Cart
  • 10 Gallon Marine Water Tank MW-33. Technical drawing of a polyethylene water tank designed for marine vessels.

    10 Gallon Marine Water Tank MW-33

    This tank ships in 6-8 weeks. Custom fitting placement is not available at this time. It can be ordered blank, or blank with a DIY Fitting Kit Custom Roto-Mold 10 Gallon Marine Water Tank, Part# MW-33, is engineered to meet the requirements of mobile...

    MSRP: $221.11
    $204.11
    Add to Cart