Roth MultiTank®

Roth MultiTank®

World's Strongest Plastic Septic Tank on the Market

The Roth MultTank® is the first tank of its kind. It can be used for water cistern, pump, holding, rainwater, or septic tank. This is possible due to its special construction of an inner layer of FDA approved virgin HDPE, two inside layers of PE for improved stability, plus one outer layer of black and UV-stabilized PE. Not only is it special in terms of its construction, but it also has the best warranty the industry has to offer lifetime corrosion protection and 5 years of labor insurance coverage (see warranty for more details).

Installation Manual →

  • Features:

    • Low-profile: less digging, avoid high-water table
    • Lightweight vs. concrete: Installers can handle without special equipment
    • Heavyweight vs. poly: strongest tank on the market
    • Multi-port inlet/outlet: Convenient field piping, enter/exit tank on ends or sides
    • 2 - 24" manways: Easy access for maintenance and service
    • Poly construction: Lifetime corrosion protection and Industry first 5-year labor insurance coverage
    • Dual-purpose: Use as a septic, pump, holding or rainwater collection tank
    • Rugged construction: Use of native materials for backfill (no clay)
    • Cylindrical shape: Absolutely no water required for backfill, saves time
    • Threaded riser system: Easy installation, no screws or assembly


  • Benefits:

    • Environmentally Sound – Watertight, corrosion resistant and FDA approved construction
    • Versatile – can be used for water cistern, pump, holding, rainwater, or septic tank
    • Heavy Duty – Designed to perform under tough conditions
    • Code Compliant – Meets or exceeds state requirements and NSF 61
    • Installer Friendly – Easy handling and multi-port inlet / outlet pipe configurations
    • Safe & Secure – Sturdy, lockable, threaded cover, and riser system
    • Low-profile high-performance design
    • Convenient and watertight threaded access riser system
    • Includes connection gaskets and threaded manhole covers
    • No water required during backfill process
    • Lightweight Design
    • A Perfect Concrete Alternative
    • CSA, NSF and IAPMO Certified
    • High Strength Engineered Resin
    • Patented COEX-4 Multi-Layer Co-Extrusion Process
    • Best warranty the industry has to offer
    • World’s Strongest Plastic Septic Tank on the Market
    • Industry Premier Warranty

  • Sizes Available:

    • 500 Gallon Septic / Pump / Cistern
    • 750 Gallon Septic / Pump / Cistern
    • 1000 Gallon Septic / Pump / 2-Compartment / Cistern
    • 1250 Gallon Septic / Pump / 2-Compartment / Cistern
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