IBC Tanks for Emergency Water Storage: A Preparedness Guide

The Federal Emergency Management Agency (FEMA) provides clear guidelines for emergency water storage:

• Minimum quantity: 1 gallon of water per person per day for drinking and sanitation. FEMA recommends planning for at least 3 days (72 hours).
• Practical recommendation: 2 gallons per person per day is a more realistic target that accounts for cooking, hygiene, and hot-weather consumption. Children, nursing mothers, and people with medical conditions may need more.
• Pets: Add 1 gallon per day for each large pet, 0.5 gallons for medium pets.
• Extended emergencies: For rural areas where restoration of water service may take longer, FEMA suggests planning for 14 days or more.

Not every IBC is suitable for drinking water storage. Follow these guidelines when selecting a tank:

Food-Grade Only

For potable water storage, use only food-grade IBC totes. A food-grade IBC has an HDPE bottle manufactured from FDA-compliant resin and has only contained food-grade products in its previous life. Never store drinking water in an IBC that previously held chemicals, petroleum products, detergents, or other non-food substances -- even after cleaning. The porous nature of HDPE means chemical residues can leach from the plastic even after thorough washing.

We stock new food-grade IBCs and reconditioned food-grade IBCs that are verified for potable water storage. Reconditioned IBCs with a new inner bottle offer the best value for emergency water storage -- you get a brand-new food-grade bottle at a fraction of the cost of a completely new IBC.

Grade Matters

For used IBCs, stick with Grade A (like new) or Grade B (minor cosmetic wear). The bottle must be free of cracks, stress marks, and significant discoloration. The valve must operate smoothly and seal completely. The fill cap gasket must be intact. Refer to our buying guide for detailed grading criteria.

Opaque or Light-Blocking

Standard IBC bottles are translucent, which allows light to penetrate and promote algae growth. For long-term water storage, either choose an opaque (black or dark-colored) bottle or cover the exterior with opaque material -- UV-resistant paint, a tarp, or a purpose-built IBC cover. This is essential for maintaining water quality over months of storage.

Municipal tap water is already treated and safe to drink, but the residual chlorine that keeps it safe dissipates over time. For storage durations beyond a few days, additional treatment is necessary to prevent bacterial growth.

Method 1: Household Bleach

Add unscented liquid chlorine bleach (sodium hypochlorite, 5.25% to 8.25% concentration) to the water at the time of filling:

• Use 1/4 teaspoon (approximately 16 drops) per gallon of water
• For a 275-gallon IBC: approximately 4.3 tablespoons (about 68 mL)
• Mix thoroughly by filling the IBC with the hose running at full pressure to create turbulence
• The water should have a faint chlorine smell after treatment. If it does not, add another 1/4 dose
• Effective storage duration: 6 to 12 months before re-treatment is needed

Method 2: Water Preserver Concentrate

Commercial water preserver products (such as Water Preserver Concentrate) are EPA-registered and designed specifically for long-term storage:

• Treats water for up to 5 years without rotation
• Easier to dose accurately than bleach
• Does not affect taste as significantly as chlorine
• More expensive per treatment but reduces the labor of frequent rotation

Method 3: UV Sterilization

A UV sterilization wand or inline UV treatment system kills bacteria and viruses without chemicals. This is best used at the point of consumption (when you draw water from the IBC) rather than as a long-term storage treatment. UV does not provide residual protection.

Important: Never use pool chemicals, industrial chlorine, or scented bleach for drinking water treatment. These contain additives that are not safe for consumption.

How long your stored water remains safe depends on the treatment method, storage conditions, and container quality:

Rotation Best Practices

• Label each IBC with the fill date and treatment method using a permanent marker or weatherproof tag
• Set calendar reminders for rotation dates
• When rotating, inspect the interior of the empty IBC for sediment, biological growth, or discoloration
• Clean the IBC during rotation -- a pressure wash and sanitizing rinse takes 30 minutes
• Rotate in spring or fall when the water can be used for garden irrigation

Use this formula to determine how many IBCs you need:

Example Scenarios

Use our IBC calculator for a more detailed estimate that includes livestock, gardens, and non-drinking water needs.

• Location: Store the IBC in a cool, dark place. A garage, basement, or covered porch is ideal. Avoid direct sunlight and areas near chemicals, gasoline, or pesticides. Keep the IBC away from heat sources like furnaces and water heaters.
• Temperature: Water stores best between 50 and 70 degrees Fahrenheit. Higher temperatures accelerate bacterial growth and chlorine dissipation. In Nebraska, an unheated garage may freeze in winter -- see our winterization advice or consider an IBC heating blanket.
• Floor loading: A full 275- gallon IBC weighs approximately 2,300 pounds. Verify your floor can handle this load. Concrete slab-on-grade is ideal. Elevated floors (upper stories, decks) may require structural verification.
• Access: Position the IBC so the bottom valve is accessible for dispensing. Elevating the IBC 12 to 18 inches on cinder blocks provides enough clearance to fill a jug or bucket directly from the valve.