3450 Gallon Plastic Water Storage Tank: Complete Buyer's Guide
The 3,450-gallon black water tank is a tall, large-capacity potable reserve — 96 inches across and 119 inches tall, a nearly ten-foot column holding over sixteen tons of water full. The opaque black wall blocks algae-feeding light, and the FDA-compliant resin keeps the stored water drinkable.
Specifications at a Glance
Every figure below is pulled straight from the live product record for this exact tank — the same data on the product page, so what you read here and what you buy never disagree.
Standards & Materials
- ASTM D1998 — Standard Specification for Polyethylene Upright Storage Tanks. Governs wall-thickness and hydrostatic design for vertical rotomolded poly tanks of this class.
- FDA 21 CFR 177.1520 — Olefin polymers. The food-contact regulation the FDA-grade resin in this tank is compounded to meet.
- Specific gravity rating 1.1 — the tank is engineered for liquids up to 1.1× the density of water (water is about 8.34 lb/gal). Confirm your fluid’s SG before storage.
Product Overview
Thirty-four hundred fifty gallons is serious water security — enough to carry a household or operation through extended outages, support irrigation, or anchor a fire-protection reserve. Unlike the squat large tanks, this one goes up: eight feet wide but nearly ten feet tall, a taller column that delivers substantial capacity on an eight-foot footprint, useful where floor space is tighter than vertical room.
Norwesco rotomolds it as one seamless piece of virgin linear polyethylene with FDA-compliant resin for potable and food-grade contact. The seamless wall leaves no joint to leak under load and no crevice to harbor biofilm in a large drinking-water reserve. The wall is rated to a 1.1 specific gravity, covering water with margin — and at nearly ten feet of liquid head, the wall is graduated thicker toward the base to carry the higher pressure there.
Black is the practical color for a tall water tank: fully opaque, it blocks the light algae needs, keeping a large reserve clearer with less cleaning, and it resists UV strongly for long outdoor life. Empty weight is 445 pounds; filled with water it loads the pad with roughly 32,095 pounds, over sixteen tons across the 96-inch base. Maximum service temperature is 120°F.
Plumbing comes ready: a 2-inch NPT outlet for strong flow and a 1.5-inch NPT inlet fitting included. The 16-inch lid serves fill, vent, and inspection — sitting about ten feet up given the column height. Norwesco's 3-year warranty applies, and the tank ships via dedicated freight carrier given its dimensions — contact us for delivery timeline and site access.
Technical Drawing
Official Norwesco technical drawing — 3450 Gallon Plastic Water Storage Tank
Key Features and Specifications
- 3,450-gallon capacity — sized for safe potable water storage
- Constructed from virgin linear polyethylene (HDPE) with 1.1 specific gravity rating — handles liquids up to 9.2 lbs/gal
- 119" tall x 96" diameter — compact vertical footprint
- 445 lbs empty, approximately 32,095 lbs when full at rated specific gravity
- 2" NPT outlet fitting — factory installed and leak-tested
- 1.5" NPT inlet fitting included
- 16" lid opening for fill, venting, and interior access
- FDA approved for potable water and food-grade liquid contact
- 3 Year Warranty from Norwesco against manufacturing defects
- UV-resistant black pigmentation provides maximum outdoor durability and inhibits algae growth in stored liquids
- Rated for continuous service up to 120 F / 48 C
- Seamless one-piece rotational molding — no seams, no welds, no leak points
- Manufactured by Norwesco — a leading name in rotomolded polyethylene tanks
- Install on a level, compacted surface. Ensure adequate clearance above for lid access and around the perimeter for plumbing connections and visual inspection
- Ships via dedicated freight carrier due to oversized dimensions — contact us for delivery timeline and site access requirements
Installation and Setup Guide
A sixteen-ton full tank standing nearly ten feet tall needs both a serious foundation and respect for its height. The taller column raises the foundation stakes and puts the lid out of casual reach.
Site Preparation
Provide an engineered base for the full load across the 96-inch footprint — a substantial reinforced concrete slab is the right call for sixteen tons with nearly ten feet of liquid head bearing on the base, level within an inch across the diameter and on uniformly compacted subgrade. The taller column means any out-of-level condition shifts the load toward one side, so getting the slab dead level matters more here than on a squat tank. Choose a well-drained site.
Placement and Connections
Connect the included 1.5-inch inlet to your fill source and the 2-inch outlet to your pump or gravity line. Use flexible connections at both fittings — a ten-foot column flexes with thermal cycling, and a rigid line on a heavily loaded fitting will fail. The lid sits about ten feet up, so plan a proper platform or ladder for safe fill and inspection access rather than improvising. Support piping independently of the tank.
Venting
Fit a screened vent in the 16-inch lid sized to your peak fill and draw flow. A tall tank under fast draw is vulnerable to vacuum, so don't undersize it. The screen keeps insects, debris, and small animals out of the potable reserve while the tank breathes — essential on a drinking-water tank.
Maintenance and Long-Term Care
Maintaining a tall sixteen-ton water tank means watching the column stay plumb, protecting the high-stress base, and keeping a large reserve drinkable.
Quarterly Inspection Checklist
- Plumb and base: Sight the ten-foot column against a true vertical and confirm the 96-inch base sits evenly. A developing lean from base settlement loads the wall asymmetrically — correct the pad before refilling.
- Lower wall: Inspect the base region, which carries the peak hydrostatic load from nearly ten feet of water, for any bulge or distortion.
- Water clarity: Look through the 16-inch lid for cloudiness, sediment, or growth; in an opaque tank, growth usually means a compromised screen or seal.
- Fittings and vent: Check the 2-inch outlet and 1.5-inch inlet for weeping, and confirm the vent and screen are clear.
Cleaning and Sanitizing
Sanitize at least annually. Drain the tank, scrub the interior through the 16-inch lid (with fall-protection and confined-space precautions given the height), then disinfect with a chlorine solution — about a quarter cup of unscented household bleach per 15 gallons used — let it dwell, drain, and flush with fresh water until the chlorine odor is gone. This clears biofilm and keeps a large reserve safe to drink.
UV and Weather
Black polyethylene resists UV strongly, so the tall wall handles full sun well; inspect exposed faces yearly for chalking. In hot climates the dark wall absorbs heat — a large volume warms slowly, but partial shade keeps water cooler if that matters for your use.
Alternatives and Comparisons
For thirty-four hundred fifty gallons of water, the choice is shape and color:
This tall column versus a wide, low tank of similar capacity: the taller tank fits where floor space is tight but vertical room is available, and gives more gravity head from the higher column. A wide low tank is more foundation-friendly and easier to access without a platform, at the cost of a larger floor footprint. Choose by which constraint your site has.
Black versus a lighter color: the opaque black wall controls algae and resists UV for low-maintenance outdoor potable storage, where a translucent tank would admit algae-feeding light. For a large stored reserve, opaque is the better trade.
Other 3450-Gallon Options
Frequently Asked Questions
How long will the 3450 Gallon Plastic Water Storage Tank last?
Fifteen to twenty years is realistic with an engineered, level base and normal use. The taller column makes foundation quality the dominant life factor — settlement that leans the tank is what shortens it — while black polyethylene's UV durability and the seamless, jointless wall carry it to the upper range when the base holds true.
What chemicals can I store in this tank?
This is a potable water tank — FDA compliant for drinking water and food-grade liquids, rated to a 1.1 specific gravity for water and benign aqueous solutions up to about 9.2 pounds per gallon. It is not for aggressive chemicals, fuels, or solvents; use a higher-specific-gravity tank verified for those. Keep this one dedicated to water.
What kind of foundation does a 3450-gallon tank need?
It needs an engineered, level base — a substantial reinforced slab is appropriate — sized for roughly 32,095 pounds across the 96-inch footprint with nearly ten feet of liquid head, on uniformly compacted subgrade. Because the column is tall, a dead-level slab matters more here than on a squat tank to avoid an off-center load.
Does this tank come with a warranty?
Yes — Norwesco's 3-year warranty covers defects in materials and workmanship. It excludes uneven or improper installation (a real concern on a tall tank), freezing damage, and impact damage. Keep documentation of the engineered, level pad.
Can I install this tank underground?
No — this is an above-ground vertical not engineered to resist soil pressure, and a tall tank is a poor burial candidate. Soil pressure would collapse the wall. For below-grade water storage, use a purpose-built underground cistern designed for soil load.
Buying Considerations
Before ordering, confirm you have nearly ten feet of vertical clearance plus safe access to the lid for filling and inspection; ensure an engineered, level slab for sixteen-plus tons is in your scope; and plan freeze protection for the plumbing if hard winters apply. The included 2-inch outlet and 1.5-inch inlet make it ready to integrate, and the tall column gives useful gravity head. It ships by dedicated freight carrier — call us to coordinate delivery and confirm equipment and access for setting and standing a ten-foot shell.
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