Underground Water Storage Tanks

Underground Fiberglass Tanks

underground fiberglass water storage tanksFiberglass Underground Water Storage Tanks are one of the highest strength options for storing water in a below ground location. Constructed from fiberglass, these tanks are naturally equipped to handle the demanding nature of underground conditions. Standard design includes a ribbed exterior and built-in fittings for easy plumbing and maintenance on tanks.

When compared to other tank materials, the fiberglass fabric has a naturally high resistance to rusting, denting, cracking and deterioration. The material is naturally light in weight, making it easy to install and set up in your location. Standard fiberglass tanks are rated for burial of about three feet (3') below ground. Higher strength options are also available for increased burial depths or drive rated requirements.


If you have questions about underground fiberglass tanks, give us a call at 1-863-261-8388 or request a price quote.

Underground Fiberglass Tanks Features

  • Fiberglass Material
  • Exterior: Rugged, Ribbed Design
  • Built-in Fittings
  • Light Weight Materials
  • Resins Chosen to Match Liquid Being Stored in the Tank
  • Models: Standard and Drive Rated Options
  • Typical Specifications


Underground Fiberglass Tanks Benefits

  • Built for Underground Conditions
  • High Resistance to Rusting, Cracking, and Corrosion
  • Can be Used in Multiple Locations
  • Keeps Soil Out of the System
  • Prevents Contamination to Underground Water Supply
  • Rated for Long Term Use


Underground Fiberglass Tanks Typical Applications:

  • Sewage Containment in Homes
  • Waste Storage for Hotels, Resorts, and Businesses
  • Use in Industrial Facilities


If you have questions about products, give us a call at 1-863-261-8388 or request a price quote.

Underground Fiberglass Tank
Typical Specifications

Nominal (gal) Dimensions Weight (lbs.)
525 5' D x 4'8" 147
750 - -
1050 5' D x 9'3" 245
1250 5' D x 10'11" 340
1550 5' D x 13'5" 343
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
10000 8' D x 31'6.5" 3300


*Standard Tanks can be buried up to 36 inches (3 feet)--Please specify if your tank needs to be buried more than 3 feet so proper adjustments can be made.

Underground Fiberglass Tank Accessories

Description Dimensions Weight (lbs.)
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 Bw/ rings 9"x14"x9" 6

Request a Technical Drawing

Additional Underground Water Storage Options:

Fiberglass underground tanks are one of many underground storage units equipped to store liquids, water, and more. Additional options include the following:


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If you have questions about underground fiberglass tanks, give us a call at 1-863-261-8388 or request a price quote.