Does Bottled Water Expire?
Water itself doesn't expire or go bad, but bottled water does have expiration dates primarily for quality reasons. Over time, plastic bottles can leach chemicals into water (especially in heat or sunlight) and allow tiny amounts of air to affect taste. Glass-bottled water lasts indefinitely. The FDA doesn't require expiration dates on water, but most brands use 2-year dates for quality assurance.
Key Takeaways
- Pure water (H2O) is chemically stable and doesn't decompose or spoil.
- Sparkling water lasts shorter (about 1 year) as carbonation gradually escapes through the plastic.
- Never leave bottled water in hot cars - heat dramatically accelerates plastic leaching.
Explanation
Pure water (H2O) is chemically stable and doesn't decompose or spoil. The expiration date on bottled water relates to packaging, not the water itself. Plastic bottles are slightly permeable - over years, trace amounts of the surrounding environment can migrate into the water, potentially affecting taste.
The main concern with old bottled water is chemical leaching from plastic. PET plastic (most common for water bottles) can leach antimony and other compounds, especially when exposed to heat or sunlight. Studies show minimal leaching under normal conditions within the labeled shelf life, but degradation accelerates in poor storage conditions.
From a food safety perspective, commercially bottled water stored properly is essentially safe indefinitely. The FDA considers bottled water to have an indefinite shelf life if produced properly and stored correctly. Taste changes may occur, but old bottled water won't make you sick unless contaminated during opening or storage.
State regulations vary on expiration dates. New Jersey is the only US state that mandates a 2-year expiration date on bottled water, which is why most national brands adopted the 2-year standard for consistency. The International Bottled Water Association notes that the date is purely about packaging integrity, not water safety. Stored at a consistent 50-70°F in a dark location, bottled water in PET plastic maintains quality well beyond the printed date.
For emergency preparedness, FEMA recommends storing at least 1 gallon of water per person per day for a minimum 3-day supply. Commercially bottled water in factory-sealed containers is the safest option for emergency stockpiles and can be stored for years when kept in cool, dark conditions. Rotate stock every 6-12 months for optimal taste, but understand that water stored longer remains safe even if the flavor changes slightly.
Things to Know
- Sparkling water lasts shorter (about 1 year) as carbonation gradually escapes through the plastic.
- Never leave bottled water in hot cars - heat dramatically accelerates plastic leaching.
- Once opened, bottled water should be finished within a few days or refrigerated to prevent bacterial growth from your mouth.
- Glass or stainless steel containers avoid plastic leaching entirely - transfer water if long-term storage is needed.