The Bushman 125 Gallon Vertical Rainwater Harvesting Tank (BM-30078) gives you a slim, 30-inch-square footprint that fits tight against a downspout, in a side yard, or along a fence line where a wider tank won't go. At 50 inches tall and 30 by 30 inches at the base, it holds 125 gallons of collected rainwater in a green polyethylene body that blends into landscaping and shades the water to slow algae growth. It's a practical size for RV water supply, garden and irrigation top-up, livestock water, and small-scale rain harvesting where a 125-gallon vertical tank covers the demand without dominating the space.
Will it work for your site?
This is a water-service rainwater tank rated at 1.0 specific gravity, which is exactly right for rainwater, RV water supply, and irrigation. Filled to capacity, the tank and water weigh about 1,042 pounds, and that 1,042 lb figure is the maximum rated contents load at 1.0 SG — fine for water, but it means no denser-than-water fluids. If you need to store something heavier, like a fertilizer solution or brine, call 866-418-1777 for a chemical-rated tank built to a higher 1.5 or 1.9 specific gravity rather than overloading this water-class shell. Plan your stand or pad for that full load on the 30 x 30 inch footprint: sitting that weight on level, fully supported ground keeps the tank from rocking or stressing the fittings. For pad design on above-ground poly tanks, see our concrete pad sizing guide, and use the Tank Sizing Calculator with the Tank Sizing Guide to confirm 125 gallons matches your roof catchment and draw-down.
Fittings and connections
Per the technical drawing on this page, this tank carries two pre-molded flat fitting pads — an 8" x 7" and an 8" x 6" — that give you true, gasket-flat sealing surfaces for adding a bulkhead or valve exactly where you need it, such as a low garden-hose draw on one pad and a pump suction on the other. It comes configured with a 3-inch outlet and overflow kit and a 3/4-inch bulkhead fitting with a polypropylene body and an EPDM seal. That EPDM gasket is the chemical boundary on this tank: EPDM is correct for rainwater, potable-grade water, and UV and ozone exposure, but it is not compatible with petroleum or oil-based fluids — another reason to treat this as a deliberate water-service build. The 3-inch overflow is sized to pass a full downspout's storm surge so the tank can't pressurize or back up at the inlet during a hard rain, which is why the kit is 3 inches and not 3/4. Route that overflow away from the foundation so heavy storms shed water cleanly instead of pooling at the base. If you're tying this into a roof-washing setup, pair it with a first-flush diverter so the dirtiest initial runoff never reaches the stored water — our guide on Bushman rainwater tanks and first-flush diverter sizing walks through that per the Texas Manual on Rainwater Harvesting.
Sizing it into a real harvesting system
A 125-gallon vertical tank is a building block. Many sites run two or more in series off a single downspout, or use one as an RV water reservoir and another for the garden. If you're sizing rainwater storage against your local rainfall and codes, our rainwater harvesting sizing by state guide ties tank volume to real numbers. For rural fire-protection storage where stored water does double duty, the fire-water reservoir design guide covers NFPA 22 sizing discipline. One cold-weather note grounded in these exact fittings: the EPDM seals stay pliable in the cold, but the standing water in the 3/4-inch outlet and the 3-inch overflow line is the freeze risk — drain or heat-trace those fittings before a hard freeze.
Freight
This tank ships LTL from the Bushman plant in Fairfield, Texas, with freight quoted live to your ZIP code. Get an exact number with our Freight Cost Estimator, or call 866-418-1777 and we'll quote it and answer any sizing or fitting questions before you order. Listed at our standard list price, with freight quoted separately to your delivery address.
