250 Gallon Plastic Water Storage Tank: Complete Buyer's Guide
A 250-gallon potable water tank from Norwesco, molded in one seamless piece of FDA-grade polyethylene — a quarter-ton reserve for homes, shops, and standby water that still ships by ground.
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 1.0 — the tank is engineered for liquids up to 1.0× the density of water (water is about 8.34 lb/gal). Confirm your fluid’s SG before storage.
Installation and Setup Guide
A 250-gallon tank is the largest size that still arrives by ground rather than freight terminal, and it sets up just as simply — find a flat, firm spot, support the whole base, and plumb it with a flexible tail.
Site Preparation
Stand the tank on a firm, level surface — a concrete floor, a compacted gravel pad, or a rated stand — that supports the entire bottom evenly. A full 250-gallon tank is over a ton of water, so while you are not pouring an engineered slab, you do want a base that will not settle on one side. Clear and level the spot first.
Placement and Connections
Leave about a foot of clearance for access to the fitting and lid. Plumb the outlet by the shortest route and isolate the tank from rigid pipe with a short flexible connector, so the shell's daily thermal movement stays off the threads.
Venting
A screened lid vent is essential even at this size: drawing a ton of water down without letting air back in will pull the wall inward. The vent equalizes pressure both ways and keeps the water clean of insects.
Maintenance and Long-Term Care
The 250 needs only a brief seasonal inspection to stay dependable.
Quarterly Inspection Checklist
- Visual: walk around the tank checking for bulging or a weep at the fitting.
- Fitting: hand-snug the outlet, a quarter turn past finger-tight, no wrench.
- Base: confirm the tank still sits flat and the pad has not settled.
- Vent: check that the lid vent is clear.
Cleaning
For drinking water, sanitize yearly: drain, dose with unscented bleach at roughly a quarter cup per 15 gallons of clean water, hold a couple of hours, and rinse until odor-free. An annual flush keeps sediment from building in the bottom dish.
UV and Weather Protection
If the tank stands in open sun, look over the exposed face annually for fading and shade it where you can. Shade extends the working life of any poly tank in a high-UV climate.
Alternatives and Comparisons
At 250 gallons you are at the practical ceiling for ground shipping, which makes this a popular size for buyers without dock or forklift access. Need it to travel? A transport tank rides better full. Need it through a doorway? A 250-gallon doorway tank is shaped to clear a standard frame. For a bigger standing reserve, the next steps move into freight-shipped sizes like the 525.
Other -Gallon Options
Frequently Asked Questions
How long will the 250 Gallon Plastic Water Storage Tank last?
Used within its ratings and kept out of relentless sun, this tank will serve 15 years and beyond. The seamless mold has no joint to fail, so foundation and sun exposure are the real drivers of its lifespan.
What chemicals can I store in this tank?
It is built for potable water and FDA-cleared for drinking water and food-grade liquids, and it holds light compatible solutions. Keep fuels, solvents, and flammables out, and verify any chemical on a compatibility chart before filling.
Does this tank come with a warranty?
Under normal use, Norwesco covers manufacturing defects — flaws in the molding, pinholes, and factory fittings. Misuse, incompatible chemistry, and impact damage fall outside coverage. Keep your receipt for any claim.
Can I install this tank underground?
No — this is an above-ground tank with walls that cannot resist soil pressure. Underground storage requires a tank designed for burial.
Buying Considerations
Confirm a flat, firm base that supports the full bottom, and that your contents are potable water or another compatible liquid. The freight advantage of this size is real: the 250 still ships UPS or FedEx ground and typically arrives within 5 to 7 business days, with no terminal pickup or forklift required.
Related Products You May Need
Questions? Call (866) 418-1777 — our team knows these products inside and out and can help you select the right tank for your application.
Recommended Tanks for This Guide
Live pricing, updated automatically · estimate freight to your ZIP.
