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  • Producer of fiberglass products
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Underground Fiberglass Storage Tanks

Underground Fiberglass Storage Tanks

Long Lasting Underground Liquid Storage

fiberglass underground storage tankUnderground Fiberglass Storage Tanks are a high strength, long-lasting storage option used to contain drinking water, non drinking water, waste water and chemicals. Tanks are built with a robust outer exterior that holds up to below ground storage, while their interior fiberglass resins are built to match the liquid being stored in the tank. This creates a system of storage that is able to hold liquids for extended periods of time without damage to the tank.

Standard fiberglass tank construction allows the tanks to buried up to three feet (3') below the ground. If a deeper burial is required, or if the tanks need to withstand vehicles driving over them, please let us know so that we can provide you with the most accurate quote for your location.




  • Fiberglass Tank Construction
  • Sizing up to 20,000 gallons
  • Standard 0-2" Fitting Options
  • Standard Tank can be Buried up to 36 inches (3') Underground (Please Specify if you would like a tank that can be buried more than 36 inches.)
  • Traffic-Rated Tanks Available


  • Lighter Weight for Easy Installation
  • Resistance to Leaking and Cracking
  • Equipped for Underground Elements
  • Corrosion and Rust Resistant
  • Resin Built to the Type of Liquid Store in the Tank
  • Minimal Site Prep Required


Fiberglass Underground Storage Tank Specifications

Fiberglass Tank Specifications
Capacity Dimensions Weight
525 5' D x 4'8" 147
750 - 200
1050 5' D x 9'3" 245
1250  5' D x 10'11" 340
1550 5' D x 13'5" 434
1800  5' D x 15'7" 504
2500 7' D x 13'  675
3250 7' D x 13'6" 1750
5000 8' D x 17' 8.5"  2050
6000 8' D X 20' 6.5” 2100
10000 8' D x 31'6.5 3300
11000 8' D X 34' 4”  4000
12000 8' D X 37.5'  4200
10000** 10' D X 15'  3300
11000** 12' D X 13' 3500

Above Specifications are standard sizes of tanks. Fiberglass can be manufactured to almost any specification so please don't hesitate to call with your request. 

**Escort Required for Transportation

Each fiberglass underground storage tank includes Inlet, Outlet, Overflow/Drain, Vent and a 20" Manway


Standard construction of this tank allows you to bury it up to 36 inches (or three feet). If you will need to be burying this tank deeper than three feet or if you need a tank that is traffic-rated, please specify your requirements so your tank can be adjusted to safely meet your needs. 

Standard Fittings are Galvanized (up to 2") or PVC (up to 4")
Flanged Fittings, ABS, or Other Fittings are Considered Specialty and are Extra


Description Dimensions Weight
PIP Adapter 20" D x 4" -
20” EXTENSION PER FOOT 20" D x 12" 20
24” EXTENSION PER FOOT 24" D x 12" 27
30” EXTENSION PER FOOT 30" D x 12" 35
Lift Eye - -
NYLON Tie-Down Strap 4” Wide 5
Jaw-&-Jaw Turnbuckle, 2 - 10
6-Hole Junction Box w/ rings 9"x14"x9" 6


Fiberglass Tank Uses & Options

Fiberglass underground storage tanks can been used in a range of locations to safely store liquids. Some of the most common uses for these tanks include the following:

  • Rainwater Collection and Storage
  • Potable Water Storage
  • Backup Supply for Wells
  • Irrigation Storage Tanks

Due to the strength of the its exterior, fiberglass tanks are a great solution for below ground liquid storage. Able to withstand the pressure of below ground installation, these tanks store liquids without folding or collapsing under pressure. Fiberglass tanks are also high in chemical resistance, making them ideal for protection against below ground elements and interior chemical storage. 


Additional Water Storage Tank Options

In addition to fiberglass water storage tanks featured here, we also offer several additional water storage tank options equipped to handle both potable and non-potable water. Please feel free to check out any of the pages below for more information regarding individual storage options:


Questions about the fiberglass underground storage tank? Our Portable Tanks sales team would be happy to support you. Call (+1) 772-646-0597 to discuss your storage tank requirements or
click on the chat button below for immediate response within our office hours (Mon - Fri, 8 am - 5 pm EST).

Underground Fiberglass Storage Tanks
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