What This Guide Covers
Water storage tanks span an enormous range — from 50-gallon poly tanks you can move with a hand truck to 20,000-gallon corrugated steel installations that require a concrete pad and a crane. The right size, material, and configuration depends entirely on your use case, available space, and budget.
This hub covers every size we've researched, with individual deep-dive guides for each. Each size page includes exact dimensions, full weight calculations, material comparisons, product picks from Norwesco, Snyder, and other reputable brands, and a retailer price comparison table.
Full Size Reference Table
Every major water storage tank size, with weight when full, typical footprint, price range, and a link to the full guide. Water weighs 8.345 lbs per gallon — all weights calculated at that standard.
| Size | Weight Full | Typical Dims (Vertical) | Price Range (Poly) | Common Uses | Guide |
|---|---|---|---|---|---|
| 50 Gallon | 418 lbs | 19"Ø × 38"H | $80–$200 | Home backup, RV top-up, small garden | Guide → |
| 100 Gallon | 835 lbs | 24"Ø × 46"H | $120–$350 | Detailing rigs, emergency backup, small farm | Guide → |
| 150 Gallon | 1,252 lbs | 30"Ø × 44"H | $150–$380 | Livestock, garden irrigation, detailing | Guide → |
| 200 Gallon | 1,669 lbs | 36"Ø × 44"H | $185–$420 | Farm supplement, small rainwater collection | Guide → |
| 250 Gallon | 2,086 lbs | 40"Ø × 48"H | $200–$480 | Agricultural, livestock watering, emergency | Guide → |
| 300 Gallon | 2,504 lbs | 42"Ø × 52"H | $240–$520 | Small farm, construction site | Guide → |
| 500 Gallon | 4,173 lbs | 48"Ø × 56"H | $350–$900 | Farm, fire suppression, pressure washing | Guide → |
| 750 Gallon | 6,259 lbs | 56"Ø × 56"H | $500–$1,100 | Mid-size farm, fire buffer, construction | Guide → |
| 1,000 Gallon | 8,345 lbs | 64"Ø × 56"H | $600–$1,800 | Homestead, fire suppression, irrigation | Guide → |
| 1,500 Gallon | 12,518 lbs | 72"Ø × 66"H | $900–$2,200 | Mid farm, serious fire storage, rainwater | Guide → |
| 2,000 Gallon | 16,690 lbs | 88"Ø × 60"H | $1,200–$2,800 | Large farm, off-grid household primary | Guide → |
| 2,500 Gallon | 20,863 lbs | 90"Ø × 72"H | $1,500–$3,200 | Agricultural, fire protection, commercial | Guide → |
| 3,000 Gallon | 25,035 lbs | 96"Ø × 80"H | $1,800–$4,000 | Large farm, commercial backup | Guide → |
| 5,000 Gallon | 41,725 lbs | 102"Ø × 118"H | $2,000–$5,500 | Agricultural, municipal backup, commercial | Guide → |
| 10,000 Gallon | 83,450 lbs | Steel or underground | $4,000–$12,000 | Commercial, industrial, municipal | Guide → |
| 15,000 Gallon | 125,175 lbs | Steel panel assembly | $8,000–$20,000 | Large commercial, municipal storage | Guide → |
| 20,000 Gallon | 166,900 lbs | Steel panel assembly | $12,000–$30,000 | Industrial, municipal, large ag operations | Guide → |
| Weights based on 8.345 lbs/gallon at room temperature. Dimensions are approximate — confirm with manufacturer spec sheets. Prices are typical poly; steel and fiberglass run higher. | |||||
All Size Guides
Individual deep-dive guides for each size — exact specs, product picks, installation notes, and FAQs.
Find Your Size by Use Case
Not sure where to start? Map your application to the right tank size range.
| Use Case | Recommended Size | Why |
|---|---|---|
| Home emergency water backup (1–2 people) | 50–100 gal | Manageable weight; fits in a garage; covers weeks of drinking water |
| Home emergency backup (family of 4) | 250–500 gal | Covers 20–40+ days at realistic usage; permanent pad needed |
| Mobile auto detailing (solo operator) | 100–200 gal | Fits in truck bed; supports a full day of washing |
| Mobile detailing (crew, fleet service) | 500 gal | Supports multi-vehicle days; horizontal transport tank on trailer |
| Pressure washing buffer tank | 100–250 gal | Eliminates cavitation on low-flow hose bibs; size to your pump's GPM |
| Pressure washing (contractor / commercial) | 500 gal | Full-day commercial capacity without water hookup |
| Livestock (small: poultry, goats) | 50–150 gal | Sufficient for weekly topping with float valve |
| Livestock (cattle, horses, large herd) | 500–2,500 gal | Enough buffer for automatic watering systems; fill weekly or less |
| Rural fire suppression (structure protection) | 1,000–2,500 gal | Minimum 10 min at 100 GPM pump; 2,500 gal preferred |
| Rainwater harvesting (primary storage) | 1,000–5,000 gal | Match to annual rainfall and demand; oversizing is rarely a mistake |
| Agricultural irrigation (market garden) | 500–2,500 gal | Depends on acreage and drip vs. sprinkler system |
| Construction site water | 500–2,500 gal | Concrete mixing, dust suppression, worker supply |
| Off-grid household primary supply | 2,500–5,000 gal | Full household use including laundry and showers |
| Commercial / industrial | 5,000–20,000 gal | Consult a civil engineer for load and permit requirements |
Materials: Poly vs. Steel vs. Fiberglass
Three primary materials dominate the water storage tank market. Each suits different applications, budgets, and installation environments. Here's the honest breakdown.
Polyethylene (HDPE) — Best for Most Applications
Rotationally molded high-density polyethylene (HDPE) tanks are the default choice for residential and light agricultural use at virtually every size from 50 to 5,000 gallons. The two dominant domestic manufacturers — Norwesco and Snyder Industries — produce tanks from virgin (not recycled) FDA-grade resin. Both offer potable-water-rated versions.
- Seamless — rotationally molded with no welds to fail
- Lightest per gallon of any material
- FDA-approved for potable water (when labeled)
- No rust, no corrosion, no liner required
- Best cost-to-capacity ratio across all sizes
- Wide selection: vertical, horizontal, transport, low-profile
- 20–30 year lifespan with proper UV management
- UV degradation over decades (use black or UV-stabilized tanks)
- Impact-vulnerable — a vehicle strike can crack a poly tank
- Not suitable for fuels, solvents, or aggressive chemicals
- Large tanks (5,000+ gal) can flex under load
Corrugated Steel — Built for the Long Haul
Galvanized corrugated steel tanks are assembled on-site from bolt-together panels and a flexible liner. They're the choice for large agricultural installations where longevity and appearance matter. At sizes above 2,500 gallons, steel often becomes more cost-competitive with poly. A food-grade or NSF-certified butyl liner is required for potable water storage and needs replacement every 10–20 years — factor that into your long-term cost.
Key brands: Tank Depot (proprietary), Bushman, Pioneer Water Tanks. Expect 30–50+ year lifespans. Galvanized panels are the industry standard; some manufacturers offer powder-coated options for improved corrosion resistance.
Fiberglass — Maximum Chemical Resistance
Fiberglass tanks are the right call when storing anything that reacts with poly: agricultural chemicals, fertilizer concentrates, acids, or brine. They're also common in marine and industrial applications where poly can't handle the environment. For plain water storage, fiberglass offers no advantage over poly at nearly double the cost. The interior gel coat needs inspection and occasional re-coating. Most reputable fiberglass tanks carry 5–10 year warranties.
Related Topics & Sub-Guides
What to Look for Before You Buy
Buying a water tank is not like buying a household appliance. A mismatch in material, fitting size, or configuration creates expensive problems. Here's what experienced buyers check before committing.
1. Potable vs. Non-Potable Rating
If the water in your tank will ever be consumed, confirm the tank is explicitly rated for potable use — look for "FDA-approved resin," "NSF/ANSI 61," or "safe for drinking water" on the spec sheet or product listing. Non-potable tanks can legally store water but use resin grades that aren't food-safe. The price difference is minimal; the peace of mind is worth it.
2. Fitting Size and Configuration
Most poly tanks ship with a single threaded outlet (typically 1"–2" NPT). Know what you need before ordering: How many outlets? What diameter? Inlet on top or side? Bottom outlet for gravity drain? Specialty configurations (3" outlet for fire suppression, dual-outlet for parallel plumbing) are available but must be specified at order — most poly tanks can't be field-modified without risk of voiding the warranty.
3. Delivery and Unloading
Large poly tanks (500+ gallons) ship via freight on a flatbed — not a standard UPS delivery. Coordinate with the retailer on delivery access. A 1,000-gallon vertical tank is 175 lbs empty but unwieldy — you'll need a tractor with a front loader, a forklift, or at minimum a pallet jack and multiple people. Some local Farm Bureau members and agricultural cooperatives can help arrange delivery equipment.
4. UV Exposure Plan
Black poly tanks (Norwesco's standard color) are UV-stabilized and can sit in direct sun indefinitely. White and translucent tanks degrade faster and promote algae growth inside — they should be shaded or painted if placed outdoors. Even black tanks benefit from shade in desert climates where surface temperatures exceed 150°F in direct summer sun.
5. Brand Matters at This Purchase
Stick with Norwesco or Snyder Industries for poly. Both are US-manufactured, use virgin resin, and have established warranty and customer service channels. Unbranded import tanks (often sold cheaply on Amazon) use recycled or unspecified resin grades, have no warranty structure, and routinely fail quality checks. A $30 savings on a $250 purchase is not worth the risk on a tank that's holding 800+ lbs of water in your garage.
Frequently Asked Questions
Water weighs 8.345 pounds per US gallon at room temperature (68°F / 20°C). This is the standard used for tank engineering and load calculations. Use our water weight calculator to convert any volume to weight instantly.
Norwesco and Snyder Industries are the two most reputable poly tank manufacturers in the US. Both use virgin FDA-grade HDPE resin, offer potable water-rated tanks, and have established warranty programs. For corrugated steel, Pioneer Water Tanks and Tank Depot have strong track records. Avoid unbranded import tanks regardless of price.
Quality HDPE tanks from Norwesco or Snyder carry 3-year warranties but routinely last 20–30 years with proper care. Key factors: manage UV exposure (black tanks are best for outdoor use), don't store empty in hard-freeze conditions (water expands 9% when frozen), use appropriate fittings (brass or poly — not iron), and inspect outlet fittings annually for stress cracks.
For most rural and agricultural applications, no permit is required for aboveground tanks under 5,000 gallons. Exceptions: if the tank connects to a potable plumbing system (plumbing permit may apply), if it's a fire suppression system connected to a structure (fire code inspection), or if you're collecting rainwater (some states regulate rainwater harvesting). Check with your county building department before installing — requirements vary significantly.
Vertical tanks have a smaller footprint and are better for stationary installations where height isn't a constraint. Horizontal (transport) tanks are wider, lower to the ground, and have a lower center of gravity — they're the right choice for truck beds and trailers where sloshing water at a higher CG would be dangerous. Horizontal tanks also typically have flat bottom sections or cradle mounts for secure vehicle attachment.
Yes — this is called a manifold or daisy-chain configuration. Multiple tanks connected by equalizer lines at the bottom maintain equal water levels automatically. You'll need matching outlet fittings on each tank, a horizontal equalizer pipe, and a single outlet pump connection. This is a common way to expand capacity without replacing a working tank. IBC totes (275–330 gal each) are frequently manifolded in sets of 3–4 for cost-effective large-volume storage.