The Norwesco 6100 Gallon Black Vertical Storage Tank is a bulk above-ground polyethylene vessel built for large-volume water storage, where a single high-capacity tank replaces a bank of smaller ones. Molded in black polyethylene at a full 6,100 gallons, it stands 140 inches tall on a 119 x 119 inch square footprint and carries a 1.5 specific gravity rating. Because water itself loads the wall at only about 1.0 SG, that 1.5 rating is built-in structural margin: the tank holds 50,874 pounds of water but is rated to carry up to 76,311 pounds of contents. This is the vertical storage tank operators reach for when they need serious volume in a single footprint.
Will it work for your site
Plan around the weights, not just the gallons. The 76,311 lb rated load drives everything underneath the tank, so the 119 x 119 inch footprint must sit on a foundation built for that mass. Before you order, confirm your pad is:
- Level and continuous (no crushed-stone ring or partial bearing)
- Full-support across the entire 119 x 119 inch footprint
- Rated for the full 76,311 lb contents load
For sizing the slab to that load, see our Concrete Pad Sizing for Above-Ground Polyethylene Tanks guide, and use the Tank Sizing Calculator or Tank Sizing Guide to confirm a 6,100-gallon vessel matches your demand profile. Exact fitting and outlet sizes and locations are not listed in this product's data, so review the technical drawing on this page and call 866-418-1777 to confirm the plumbing configuration against the drawing before you commit freight on a tank this size.
Where it fits in your water system
At this volume the tank is a natural fit for bulk water reserves, including fire-water reservoirs and reuse trains that aggregate rainwater, grey-water, or condensate into quality-banded storage. The black polyethylene wall blocks light, which suppresses algae growth, and that matters most exactly where these tanks live: fire-water reservoirs sit full for months at a time, and reuse storage holds water through long dwell times. The 1.5 SG headroom is also useful here, leaving margin above plain water for heavier banded reuse contents rather than topping out at a thinner water-only wall. If you are sizing a rural or remote fire-water supply, our guide on Fire-Water Reservoir Tank Design for Rural and Remote Sites walks through NFPA 22 sizing discipline and cold-climate freeze protection, and the Industrial Water Reuse Tank Topology guide covers how to band and sequence quality streams.
The mistake to avoid
The 1.5 specific gravity rating is a structural ceiling for the tank wall, not a green light for chemical service. This is a Norwesco vertical storage tank built and stocked for water; do not assume heavier or aggressive contents are appropriate without first confirming the resin and chemistry against an OEM chemical-resistance chart. The other common miss is underbuilding the foundation: tens of thousands of pounds concentrated on a 119 x 119 inch footprint will find any weak spot in an undersized or unlevel pad, so settle the slab question before the tank ships.
Freight is often the real swing in cost on a tank this size, and this one stocks at four plants nationwide: Griffin, GA; Owego, NY; Washington Court House, OH; and Washougal, WA. Shipping from the nearest of those origins rather than a single far-off warehouse is what keeps the LTL number down. This Norwesco 6100 gallon black vertical storage tank ships LTL freight, quoted live to your ZIP from the closest stocking plant. Get a number with our Freight Cost Estimator, or call 866-418-1777 to confirm the nearest origin and lead time.
