Plastic Tanks

Professionally Designed,
Professionally Constructed

The Roth MultiTank® 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).

When used as a Potable Water Cistern, also known as a Rainwater Cistern tank, it is used for storing rainwater collected from a roof or other catchment area. Cisterns are sometimes used for storing hauled water but are usually used as a supplement to other water sources. Cisterns are very useful when the regular source of water for a farm or rural home becomes low in dry periods of the year.

Features & Benefits

  • 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
  • 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

All Products


Model #1000RMT

  • Length: 118"
  • Height: 51"
  • Weight: 450 LBS
  • Capacity: 955 Imp Gl / 4341 L
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Model #1060RMT

  • Length: 133"
  • Height: 51"
  • Weight: 520 LBS
  • Capacity: 1092 Imp Gl / 4964 L
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Model #1250RMT

  • Length: 148"
  • Height: 51"
  • Weight: 560 LBS
  • Capacity: 1219 Imp Gl / 5542 L
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Model #1500RMT

  • Length: 177"
  • Height: 51"
  • Weight: 640 LBS
  • Capacity: 1472 Imp Gl / 6692 L
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Model #300RMT

  • Length: 50"
  • Height: 54"
  • Weight: 120 LBS
  • Capacity: 250 Imp Gal / 1136 L
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Model #500RMT

  • Length: 60"
  • Height: 51"
  • Weight: 225 LBS
  • Capacity: 416 Imp Gl / 1891 L
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Model #750RMT

  • Length: 103"
  • Height: 51"
  • Weight: 360 LBS
  • Capacity: 838 Imp Gl / 3809 L
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  • 24″ I.D. Riser
  • Maximum versatility in the field
  • Watertight connection
  • Extra-strong flat-top design
  • Unique anti-slip surface
  • Easily secured against unauthorized entry
  • Excellent for riser retro-fit or cast-in

The heavy-weight champion of riser systems! Designed to provide safe and dependable access to your onsite wastewater treatment tanks, whether cast in concrete or retrofitted to an existing tank. Engineered with high-density polyethylene and gasketed watertight connection. The Roth S.T.A.R. system is the quality solution to your access riser needs.

Septic System Distribution Box

The Roth STAR Monster D-Box is the only distribution box you’ll want to carry. The STAR system is engineered with U.V. resistant high-density polyethylene and a gasketed watertight connection. The new design offers ease of installation with outlets exiting in four directions.

  • 12-Hole Distribution Box
  • Quick & easy pipe seals secured with threaded nut
  • New design allows parallel pipe runs on 4 sides
  • Invert drop of 2″ between inlet and outlet pipes
  • 24″ I.D. provides plenty of elbow room during installation, leveling and maintenance
  • Basin can be weighted with aggregate to maintain level
  • Bring to grade using the STAR Threaded Riser System
  • Includes a STAR-24L (threaded lid), gasket and security seal


  • Maximum versatility in the field
  • Extra-strong flat top design
  • Unique anti-slip surface
  • Easily secured against unauthorized entry
  • Excellent for riser retro-fit
  • Gasket and two security seals included
  • Fits all major manufacturer’s 24″ pipe


  • Retrofit – Add a ready-access riser system to existing septic tanks
  • Round or Square Openings – Cover up to 24″ corrugated pipe or Roth’s STAR 24″ Threaded Riser System
  • Stay-Put System – Secure mechanically and/or with a sealant to prevent shifting and maintain integrity
  • Complete From Top to Bottom – Finish the job with Roth’s STAR Plug Cover… the industry’s best