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Underground Water Tanks

Underground Water Tanks
Our below ground cistern tanks are specifically engineered for bulk storage and collection of fresh potable drinking water, designed exclusively for underground installations to keep water safe, cool, and out of sight. These tanks provide a discreet, space-efficient solution for reliable long-term water storage without occupying valuable surface area.Manufactured from high-density polyethylene with integrated UV inhibitors, they offer exceptional durability and resistance to environmental degradation. Crafted using virgin polyethylene resin that fully complies with U.S. FDA regulation 21 CFR 177.1520 (1) 3.1 and 3.2 (and 21 CFR 177.150(c) 3.1 and 3.2 where noted), these tanks are food-grade and completely safe for storing potable drinking water for human consumption.Their lightweight design makes installation significantly easier compared to concrete or steel alternatives—requiring less heavy equipment and labor while still providing robust performance once properly backfilled and supported.Common uses include:
  • Residential homes and cottages
  • Campgrounds and RV parks
  • Irrigation storage systems
  • Rainwater collection and harvesting
  • Fire suppression reserves
  • Emergency water supply
  • And more off-grid or rural applications
For underground tanks intended for wastewater or septic applications, we recommend checking our septic tanks section or Bruiser tanks—which are dual-rated for both potable water and septic use.Have questions about sizing, installation, fittings, or which cistern is right for your project? Reach out to our team—we're here to help!These polyethylene underground cisterns deliver clean, compliant, and low-maintenance potable water storage buried safely below ground.
  • Norwesco 250 Gallon Plastic Underground Water Storage Cistern Tank. Polyethylene; White; 56" H x 47" W x 47" L.
    Dimensional spec drawing for Norwesco 250 Gallon Underground Water Tank (47" L x 47" W x 56" H)

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    Norwesco

    SKU: N-43746

    Norwesco 250 Gallon Plastic Underground Water Storage Cistern Tank

    $697.76
    The item has been added
  • Norwesco 225 Gallon Plastic Underground Water Storage Cistern Tank. Polyethylene; White; 50" H x 48" W x 48" L.
    Dimensional spec drawing for Norwesco 225 Gallon Underground Tank (48" L x 48" W x 50" H)

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    Norwesco

    SKU: N-44827

    Norwesco 225 Gallon Plastic Underground Water Storage Cistern Tank

    $778.49
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  • Norwesco 325 Gallon Plastic Underground Water Storage Cistern Tank. Polyethylene; White; 54" H x 54" W x 54" L.
    Norwesco 325 Gallon Underground Water Tank - white, polyethylene, 54" L x 54" W x 54" H (additional view)

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    Norwesco

    SKU: N-41321

    Norwesco 325 Gallon Plastic Underground Water Storage Cistern Tank

    $1,018.73
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  • Norwesco 600 Gallon Underground Water Storage Cistern Tank. 600 gallon capacity; Polyethylene; White; 47" H x 51" W x 101"
    Dimensional spec drawing for Norwesco 600 Gallon Underground Water Tank (101" L x 51" W x 47" H)

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    Norwesco

    SKU: N-41328

    Norwesco 600 Gallon Underground Water Storage Cistern Tank

    $1,549.53
    The item has been added
  • Norwesco 550 Gallon Plastic Underground Water Storage Cistern Tank. Polyethylene; White; 67" H x 64" W x 64" L.
    Dimensional spec drawing for Norwesco 550 Gallon Underground Tank (64" L x 64" W x 67" H)

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    Norwesco

    SKU: N-40856

    Norwesco 550 Gallon Plastic Underground Water Storage Cistern Tank

    $1,569.80
    The item has been added
  • Norwesco 575 Gallon Underground Water Storage Cistern Tank. 575 gallon capacity; Polyethylene; White; 42" H x 48" W x 97" L
    Dimensional spec drawing for Norwesco 575 Gallon Underground Water Tank (97" L x 48" W x 42" H)

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    Norwesco

    SKU: N-44360

    Norwesco 575 Gallon Underground Water Storage Cistern Tank

    $1,698.99
    The item has been added
  • Norwesco 525 Gallon Plastic Underground Water Storage Cistern Tank. Polyethylene; White; 62" H x 64" W x 64" L.
    Dimensional spec drawing for Norwesco 525 Gallon Underground Tank (64" L x 64" W x 62" H)

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    Norwesco

    SKU: N-44829

    Norwesco 525 Gallon Plastic Underground Water Storage Cistern Tank

    $1,874.28
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  • Norwesco 825 Gallon Plastic Underground Water Storage Cistern Tank. Polyethylene; White; 51" H x 60" W x 92" L.
    Dimensional spec drawing for Norwesco 825 Gallon Underground Water Tank (92" L x 60" W x 51" H)

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    Norwesco

    SKU: N-43569

    Norwesco 825 Gallon Plastic Underground Water Storage Cistern Tank

    $2,187.95
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  • Norwesco 1000 Gallon Plastic Multi-Use Underground Liquid Storage Tank (for Canada). Polyethylene; Blue; 63" H x 60" W x
    Dimensional spec drawing for Norwesco 1000 Gallon Two Compartment Tank (102" L x 60" W x 63" H)

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    Norwesco

    SKU: N-41736

    Norwesco 1000 Gallon Plastic Multi-Use Underground Liquid Storage Tank (for Canada)

    MSRP: $2,439.00
    $2,196.57
    The item has been added
  • Norwesco 1000 Gallon Plastic Multi-Use Underground Liquid Storage Tank. Polyethylene; Blue; 63" H x 60" W x 102" L.
    Dimensional spec drawing for Norwesco 1000 Gallon Bruiser Tank (102" L x 60" W x 63" H)

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    Norwesco

    SKU: N-41734

    Norwesco 1000 Gallon Plastic Multi-Use Underground Liquid Storage Tank

    $2,448.99
    The item has been added
  • Norwesco 1175 Gallon Underground Water Storage Cistern Tank. Polyethylene; White; 51" H x 60" W x 127" L.
    Dimensional spec drawing for Norwesco 1175 Gallon Underground Holding Tank (127" L x 60" W x 51" H)

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    Norwesco

    SKU: N-40199

    Norwesco 1175 Gallon Underground Water Storage Cistern Tank

    $2,498.99
    The item has been added
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