5,000-Gallon Storage Tank
The 5,000-Gallon Storage Tank provides 5,000 gallons of rainwater storage in a polyethylene or fiberglass container measuring 102" diameter x 120" tall. Priced between $2,000 and $4,000 ($0.40-$0.80 per gallon of capacity), this tank is a full-scale solution for properties seeking significant water independence.
About the 5,000-Gallon Storage Tank
The 5,000-gallon tank is designed for whole-property rainwater management, small farms, or commercial applications. This volume can serve as the primary irrigation source for properties up to one acre or provide supplemental water for livestock operations. Fiberglass models offer greater structural integrity and longevity (30+ years) compared to polyethylene but cost more. Installation is a professional-grade project requiring excavation for the foundation pad, heavy equipment for tank placement, and plumbing expertise for the distribution system. A complete 5,000-gallon system typically includes pre-filtration, a first-flush diverter, UV treatment if used for semi-potable purposes, a variable-speed pump, pressure tank, and an automated top-up valve that switches to municipal supply when tank levels drop below a set threshold.
Installation Guide
A 5,000-gallon tank is a professional-grade installation requiring experienced contractors, heavy equipment, and potentially engineering permits. The foundation must be engineered for the full load — this tank weighs over 41,700 pounds when full. A reinforced concrete pad with proper drainage is essential. Delivery requires crane or boom truck access to the installation site.
At this scale, the plumbing system is equally important. Plan for pre-filtration (leaf screen + first-flush diverter), a calmed inlet to minimize sediment disturbance, a floating suction filter for the outlet, an adequately sized overflow pipe, and a distribution system with a variable-speed pump and pressure tank. If the system will supply indoor non-potable use (toilets, laundry), you will also need a backup connection to municipal water with an air gap or reduced-pressure backflow preventer.
Professional Installation Considerations
- Building permit may be required — check local codes
- Engineered foundation or excavation plan
- Crane or boom truck for tank placement
- Multi-stage filtration system for water quality
- Variable-speed pump with pressure tank
- Municipal water backup with backflow prevention
- Electrical supply for pump and any UV treatment
- Annual maintenance contract recommended
Best Uses for the 5,000-Gallon Storage Tank
The 5,000-Gallon Storage Tank is designed for whole-property water management, rural homesteads, small farms, commercial buildings, and any application where rainwater is a primary rather than supplemental water source. At 5,000 gallons, it provides the capacity to store several months of harvest for use during extended dry seasons. This size is common on properties that use rainwater for all outdoor needs plus indoor non-potable uses like toilet flushing and laundry.
States Where the 5,000-Gallon Storage Tank Is Recommended
Based on our calculations for a 1,500-square-foot asphalt shingle roof used for garden irrigation, the 5,000-Gallon Storage Tank is the recommended storage size in the following states:
- Alabama — 56" annual rainfall
- Arkansas — 50.6" annual rainfall
- California — 22.2" annual rainfall
- Connecticut — 50.3" annual rainfall
- Delaware — 45.7" annual rainfall
- Florida — 54.5" annual rainfall
- Georgia — 50.7" annual rainfall
- Hawaii — 63.7" annual rainfall
Your actual recommended tank size depends on your specific roof area, material, intended uses, and household size. Use our calculator for a personalized recommendation.