1,500-Gallon Storage Tank
The 1,500-Gallon Storage Tank provides 1,500 gallons of rainwater storage in a polyethylene container measuring 87" diameter x 58" tall. Priced between $700 and $1,200 ($0.47-$0.80 per gallon of capacity), this tank is a practical mid-range option for homeowners with dedicated irrigation or non-potable indoor needs.
About the 1,500-Gallon Storage Tank
The 1,500-gallon tank offers a substantial storage buffer for properties with large gardens, multiple outdoor water uses, or extended dry seasons. This size is popular in the southern and western United States where summer droughts can last weeks. A single 1,500-gallon tank paired with a 2,000-square-foot collection roof can supply irrigation water for a 1,000-square-foot garden through most of the growing season. At this scale, a submersible or external pump is recommended to deliver consistent water pressure for drip irrigation or sprinkler systems. The tank should be placed on a reinforced pad capable of supporting over 12,500 pounds when full. Annual maintenance includes inspecting the inlet screen, flushing sediment, and checking connections for leaks.
Installation Guide
A 1,500-gallon tank requires more preparation than a simple rain barrel but is still within reach of experienced DIY homeowners. The most critical step is preparing a proper foundation. When full, this tank weighs approximately 12,510 pounds — that weight must be distributed evenly on a surface that will not shift or settle.
Pour a 4-inch concrete pad extending 6 inches beyond the tank footprint on all sides, or prepare a compacted gravel bed at least 6 inches deep. Ensure the pad is perfectly level using a builder's level. Connect downspouts to the tank inlet using schedule 40 PVC pipe, with a leaf screen or gutter guard at each collection point. Install a first-flush diverter to improve water quality by discarding the first gallon per 100 square feet of roof after each dry period.
Recommended Accessories
- First-flush diverter (1 gallon per 100 sq ft of roof)
- Calmed inlet to reduce sediment disturbance
- Tank-level gauge (float type or electronic)
- Submersible or external pump for pressurized delivery
- Overflow pipe routed to rain garden or storm drain
- Bottom drain valve for annual cleaning
Best Uses for the 1,500-Gallon Storage Tank
The 1,500-Gallon Storage Tank serves homeowners with dedicated vegetable gardens (500-2,000 sq ft), drip irrigation systems, lawn watering needs, and indoor non-potable applications like toilet flushing. At 1,500 gallons, it stores enough water to bridge typical dry periods of 1-3 weeks in most climates. This size is also popular for small livestock operations, greenhouse irrigation, and properties seeking to reduce their municipal water consumption by 30-50%.
States Where the 1,500-Gallon Storage Tank Is Recommended
Based on our calculations for a 1,500-square-foot asphalt shingle roof used for garden irrigation, the 1,500-Gallon Storage Tank is the recommended storage size in the following states:
- Alaska — 22" annual rainfall
- Idaho — 18.9" annual rainfall
- Nebraska — 24.2" annual rainfall
- South Dakota — 20.1" annual rainfall
- Utah — 12.2" 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.