Emergency Water Preparedness
How Long Can You Store Emergency Water?
Learn how CDC guidance treats commercially bottled water and self-filled containers, how to rotate supplies, and what affects storage quality.
Direct answer
For water you fill yourself, CDC recommends replacing it every 6 months. For commercially bottled water, follow the manufacturer’s date and storage instructions. Safe storage depends on starting with safe water, clean food-grade containers, tight closures, and cool storage away from chemicals and sunlight.
Questions This Guide Answers
How often should I replace water I fill into emergency containers?
CDC recommends replacing self-filled emergency water every six months. That schedule assumes safe source water and sanitary storage; it does not guarantee that poorly handled water stays safe until the rotation date.
Full guidance: What the six-month recommendation means · Sources: CDC — Create and Store an Emergency Water Supply
Does store-bought bottled water follow the same six-month schedule?
For commercially bottled water, follow the manufacturer’s date and storage instructions. CDC’s six-month replacement recommendation applies to water you fill into containers yourself.
Full guidance: What the six-month recommendation means · Sources: CDC — Create and Store an Emergency Water Supply
Can I tell whether stored water is safe just by looking at it?
Clear appearance alone does not establish that stored water is safe. Consider the source, handling and container condition; do not drink stored water with unusual color, odor, floating material or a damaged or contaminated container.
Full guidance: How to rotate without wasting water · Sources: CDC — Create and Store an Emergency Water Supply
Where should I keep my stored emergency water?
CDC recommends a cool location, about 50°F–70°F, away from direct sunlight and toxic substances such as gasoline or pesticides. Keep containers tightly closed and dated; PHS recommends a cooler indoor location instead of a garage that becomes extremely hot.
Full guidance: How to rotate without wasting water · Sources: CDC — Create and Store an Emergency Water Supply
What the six-month recommendation means
CDC’s current home emergency-water instructions say to replace self-filled water every six months. That is a practical rotation interval, not a precise point at which water suddenly becomes unsafe. It also does not excuse poor containers or dirty filling practices.
Commercially bottled water is packaged under a different process. CDC says to observe its expiration date. Keep it in the original sealed package and follow the bottler’s storage directions.
How to rotate without wasting water
Write the fill date and source on each container. Add a calendar reminder six months ahead. At rotation, use the stored water for ordinary non-emergency purposes only if the source and handling were safe and the container is sound. Clear appearance alone does not establish safety. Clean and sanitize the vessel before refilling. Do not use water with unusual color, odor, floating material, or a damaged/contaminated container for drinking.
CDC recommends a cool storage location (50°F–70°F). Store containers out of direct sunlight, away from gasoline, pesticides, solvents, and other chemicals. Avoid garages that become extremely hot if a cooler indoor location is available.
Start with sound storage practices
Use food-grade containers intended for drinking water. Wash and sanitize them before filling, cap tightly, and avoid touching the inside of the cap or container. For the CDC’s exact cleaning procedure, see cleaning and sanitizing water containers. If your tap water is from a regulated municipal supply and no advisory is in effect, see whether tap water needs treatment before filling.
Official guidance and PHS recommendation
Official guidance: CDC — Create and Store an Emergency Water Supply says to replace self-filled water every six months and observe dates on store-bought water.
PHS practical recommendation: Use the six-month mark as a conservative household rotation schedule, but treat container hygiene and storage conditions as equally important. Keep a simple inventory: container, volume, source, fill date, and next rotation date.
Common mistakes
- Assuming sealed water can be stored anywhere indefinitely.
- Rotating water but reusing an unclean container.
- Keeping water near fuels, cleaners, or pesticides.
- Failing to date containers or confusing treated and untreated water.