Underground Water Tanks
Underground Water Tanks | Serving Customers Nationwide
Firewater Systems, Inc.
offers a variety of aboveground water tanks to accommodate your specific needs. Call or contact us for more information about our products.
B Series
B-Series 8' dia. underground tanks are made for dependable, long-lasting service. They are shipped fully assembled from the factory with vents/fittings/outlets/etc. as required.
Underground tanks require the use of clean gravel (1/8" to 3/4") as backfill completely surrounding the tank. Installation Instructions must be followed or warranty will be void.
Structural Material:
Orthophthalic Laminating Filled Resin in a Chop-Strand Fiberglass Matrix
B-Series 8' dia. one-piece c/w 5'H manway (no assembly required)
| Model | US Gallons | Dia. | Length | Weight | Drawing |
| B-2400-US | 2400 | 8' | 9' | 900 | Link |
| B-3000-US | 3000 | 8' | 10'6" | 1000 | Link |
| B-3600-US | 3600 | 8' | 12'6" | 1250 | Link |
| B-4200-US | 4200 | 8' | 14'6" | 1500 | Link |
| B-6000-US | 6000 | 8' | 19'6" | 2000 | Link |
| B-7200-US | 7200 | 8' | 22'6" | 2400 | Link |
| B-8400-US | 8400 | 8' | 25'6" | 2800 | Link |
| B-10200-US | 10200 | 8' | 30' | 3300 | Link |
| B-12000-US | 12000 | 8' | 35'6" | 3800 | Link |
| B-14400-US | 14400 | 8' | 41'6" | 4500 | Link |
| B-18000-US | 18000 | 8' | 51'6" | 5500 | Link |
| B-24000-US | 24000 | 8' | 67' | 7500 | Link |
| Tie-Downs | Call |
Gravel Requirements (Cubic Yards req'd per Burial Depth of Cover Above Tanks):
W Series
W-Series 5' dia. underground tanks are modular and are assembled on-site using supplied bolts and gaskets.
Underground tanks require the use of clean gravel (1/8" to 3/4") as backfill completely surrounding the tank. Installation Instructions must be followed or warranty will be void.
Structural Material:
Orthophthalic Laminating Filled Resin in a Chop-Strand Fiberglass Matrix
W-Series 5' dia. modular (manway not included, assembly required)
| Model | US Gallons | Dia. | Length | Weight | Drawing |
| W-900-US | 900 | 5' | 8' | 275 lbs | Link |
| W-1200-US | 1200 | 5' | 10' | 370 lbs | Link |
| W-1500-US | 1500 | 5' | 12' | 465 lbs | Link |
| W-1800-US | 1800 | 5' | 14' | 560 lbs | Link |
| W-2100-US | 2100 | 5' | 16' | 655 lbs | Link |
| W-2400-US | 2400 | 5' | 18' | 750 lbs | Link |
| W-2700-US | 2700 | 5' | 20' | 850 lbs | |
| W-3000-US | 3000 | 5' | 22' | 950 lbs | |
| MAN-12 | 12"H manway | 24" | |||
| MAN-30 | 30"H manway | 24" | |||
| MAN-60 | 60"H manway | 24" | |||
| MAN-85 | 84"H manway | 24" |
Gravel Requirements (Cubic Yards req'd per Burial Depth of Cover Above Tanks):
Ten Foot Diameter
10' dia. underground tanks are made for dependable, long-lasting service. They are shipped fully assembled from the factory with vents/fittings/outlets/etc. as required.
Underground tanks require the use of clean gravel (1/8" to 3/4") as backfill completely surrounding the tank. Installation Instructions must be followed or warranty will be void.
Structural Material:
Orthophthalic Laminating Filled Resin in a Chop-Strand Fiberglass Matrix
| Model | US Gallons | Dia. | Length | Weight | Drawing |
| B-6000-US | 6000 | 10' | 11'10" | Link | |
| B-7200-US | 7200 | 10' | 13'11" | Link | |
| B-8400-US | 8400 | 10' | 16'1" | Link | |
| B-9600-US | 9600 | 10' | 18'1" | Link | |
| B-10800-US | 10800 | 10' | 20'1" | Link | |
| B-12000-US | 12000 | 10' | 22'1" | Link | |
| B-13200-US | 13200 | 10' | 24'3" | Link | |
| B-12000-US | 14400 | 10' | 26'5" | ||
| B-15600-US | 15600 | 10' | 28'9" | Link | |
| B-16800-US | 16800 | 10' | 31'1" | Link | |
| B-18000-US | 18000 | 10' | 33'3" | Link | |
| B-19200-US | 19200 | 10' | 35'5" | Link | |
| B-21000-US | 21000 | 10' | 37'8" | Link | |
| B-24000-US | 24000 | 10' | 42'2" | Link | |
| B-26400-US | 26400 | 10' | 46'9" | Link | |
| B-31200-US | 31200 | 10' | 55'9" | Link | |
| B-36000-US | 36000 | 10' | 63'5" | ||
| B-40800-US | 40800 | 10' | 71'5" |
Underground Water Storage Tanks (Cisterns)
Underground Water Storage Tanks are heavily used for fresh potable drinking water storage, irrigation, fire suppression systems, rainwater collection systems, & many other wastewater applications that require underground storage tanks.
* Below ground rainwater collection has taken off in the past few years and our ribbed cistern water tanks have proven to be a successful component when it comes to underground rain barrels.
-Underground Ribbed Water Storage Tanks are rotationally molded tanks using Virgin Polyethylene resin which complies with U.S. Food and Drug Administration regulation 21 CFR 177.150 (c) 3.1 and 3.2, completely safe for human consumption.
-Light weight for easy transport and installation.
-Ideal for campgrounds, resorts, vacation homes construction sites for use as underground rain barrels.
*Food Grade FDA approved Virgin Polyethylene Poly Resins