Our Fiberglass Water Tanks

AWWA D120, NFPA 22, NSF 61

Nationwide Tanks is proud to contribute to the efforts of water conservation by producing tanks that are maintenance and corrosion-free. Fiberglass tanks are lightweight, therefore easily transported to the customer’s location, and designed for efficient and quick installation. Ensuring a low-cost, long-life solution, we provide the industry with exceptional quality fiberglass tanks and dedicated customer service.

Nationwide’s underground fiberglass water tanks are designed specifically to meet the industry served. We will build our underground fiberglass tanks to meet AWWA D120, NFPA 22, and NSF 61 standards depending on project requirements for water and wastewater tanks. We analyze the project data the customer provides regarding the type of water, any chemical concentration present, and operational temperature. Then our resin chemists and engineering team review required design parameters, specified standards, site, and environmental concerns, to determine the correct resin and optimal tank design for each project. Nationwide Tanks’ technology team of engineers, chemists, and designers utilize the latest technology to produce a superior product. Our corrosion-resistant fiberglass tanks are durable, lightweight, and watertight, resulting in a longer life cycle than underground concrete or steel tanks.

Water Tank

Fire Protection Tanks

The versatility of fiberglass tanks makes them ideal for commercial fire protection applications. As concerns continue to grow about water shortages in many parts of the United States, municipalities and facility owners continue to search for ways to better manage their water resources. Water storage for fire protection systems is one specific application where plumbing, mechanical and fire protection engineers across the country are searching for reliable, cost-effective storage options to hold thousands of gallons of water. Whether used for dry hydrant, storage, or capture, specifying engineers prefer our underground fiberglass water tanks as they provide a reliable water source without obstructing the view or site layout as well as protect property values. All our fire protection tanks are manufactured to meet or exceed the material and design requirements in NFPA 22, NFPA 20, and NFPA 1142.

Types of Water Tanks

  •  Fire Suppression Tanks
  •  Potable Water Tanks
  •  Rainwater Tanks
  •  Irrigation Tanks

  •  Stormwater Tanks

  •  Waste Water Tanks 


  • Non-corrosive, will not rust like steel

  • Durable, strong, light weight and watertight 
  • High tensile strength and flexibility, will not crack like concrete
  • Underground design saves space, allows for some insulating properties, removes aesthetic problems of an above ground tank
  •  Custom-designed per project criteria

  • H20 structural design available
  • Multi-purpose use for emergency potable water and fire suppression; rainwater and irrigation 


  • 24”, 30” and 36” Manways
  • Fiberglass nozzles

  • Large bottom sumps

  • Risers

  • Vortex breakers

  • Down pipes

  • Vent/level indicators

  • Dry hydrant accessories

  • Deadman, straps and turnbuckles

8′ Diameter Underground Water Tanks
Nominal Capacity Water Volume Dome to Dome Weight  [Pounds] Number of Straps
5,000g 5,127g 16′ 2,620 2
6,000g 6,155g 19′ 3,000 2
8,000g 8,135g 24′ 3,630 2
10,000g 10,191g 30′ 4,390 2
12,000g 12,171g 35′ 5,030 4
15,000g 15,179g 43′ 6,040 4
18,000g 18,135g 49′ 6,800 6
20,000g 20,115g 54′ 7,440 6
10′ Diameter Underground Water Tanks
Nominal Capacity Water Volume Dome to Dome Weight [Pounds] Number of Straps
10,000g 10,177g 20′ 3,750 2
12,000g 12,152g 23′ 4,230 2
15,000g 15,190g 28′ 5,020 4
18,000g 18,128g 33′ 5,810 4
20,000g 20,245g 38′ 6,440 6
25,000g 25,178g 45′ 7,710 6
28,000g 28,115g 50′ 8,500 8
30,000g 30,265g 54′ 9,130 8
35,000g 35,166g 62′ 10,400 8
40,000g 40,253g 71′ 11,820 8

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