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Below Ground Fiberglass Cisterns (water storage tanks)

Cisterns Water Storage TanksBelow ground water tanks (cisterns) are ideal for underground water storage for drinking water, fire protection, irrigation, rainwater and grey water.

General Information

  • Sizes range from 2,000 gallon to 15,000 gallon
  • Standard design and custom tanks available
  • Manufactured from F.D.A. listed material for potable water
  • Non-corrosive for long tank life
  • Wide variety of accessories and fittings available.

Fiberglass Below Ground Storage Tanks - Ribbed
Part Number Type Capacity Weight Length Diameter
LFS2000CIS Ribbed 2000 gallon 667 lbs 96" 90"
LFS3000CIS Ribbed 3000 gallon 1000 lbs 132" 90"
LFS4000CIS Ribbed 4000 gallon 1335 lbs 168" 90"
LFS5000CIS Ribbed 5000 gallon 1667 lbs 204" 90"
LFS6000CIS Ribbed 6000 gallon 2000 lbs 240" 90"
LFS7000CIS Ribbed 7000 gallon 2334 lbs 276" 90"
LFS8000CIS Ribbed 8000 gallon 2667 lbs 312" 90"
LFS9000CIS Ribbed 9000 gallon 3000 lbs 348" 90"
LFS10000CIS Ribbed 10,000 gallon 3334 lbs 384" 90"

Ribbed Fiberglass Water Storage Tanks are laminated on a controlled turning fixture. Lay-up thickness is 5/16” minimum to a 3/8” maximum with reinforced ribs every 18”. They have a two-ply gray gelcoat finish. Fittings include: 20” manway and cover; inlet, outlet, and drain located and sized according to your specifications. Maximum of three feet of cover over the top of the tank.

Glastec Fiberglass Below Ground Storage Tanks
Part Number Capacity Length Diameter
LGT2000CIS8 2000 gallon 9'11" 8'
LGT3000CIS8 3000 gallon 12'3" 8'
LGT4000CIS8 4000 gallon 15'1" 8'
LGT5000CIS8 5000 gallon 17'9" 8'
LGT6000CIS8 6000 gallon 20'7" 8'
LGT7000CIS8 7000 gallon 23'1" 8'
LGT8000CIS8 8000 gallon 26'1" 8'
LGT9000CIS8 9000 gallon 28'9" 8'
LGT10000CIS8 10,000 gallon 31'7" 8'
LGT11000CIS8 11,000 gallon 34'4" 8'
LGT12000CIS8 12,000 gallon 37'1" 8'
LGT13000CIS8 13,000 gallon 41'2" 8'
LGT14000CIS8 14,000 gallon 44' 8'
LGT15000CIS8 15,000 gallon 46'9" 8'

Cisterns are also available in 4', 6', 10' and 12' diameters and in many other capacities. Please call for information and pricing.


Standard fiberglass tanks include 20” manway, two fittings up to 4” size, lifting lugs, 3’ maximum burial depth