No, water itself does not expire. Pure water, as a chemical compound (H₂O), is incredibly stable and doesn't degrade over time. However, the container and storage conditions significantly impact the quality and safety of stored water.
Bottled Water: Expiration and Degradation
While the water itself doesn't expire, bottled water can be affected by several factors:
-
Plastic Bottles: Plastic bottles can degrade over time, leaching chemicals into the water. This can alter the taste and potentially pose health concerns, especially with prolonged storage. Microplastics may also contaminate the water. As stated in several sources (ProStack, Healthline), these concerns are linked to the packaging, not the water itself.
-
Shelf Life: Although the FDA doesn't mandate expiration dates for bottled water (Eat Drink Lagos), manufacturers often recommend a shelf life of 1-2 years for still and sparkling water respectively (Drink Heart Water). After this time, aesthetic issues like off-odors might develop. Expired water is usually still safe to drink, but this is not guaranteed (Business Insider).
-
Storage: Improper storage can introduce contaminants. For example, storing water in a hot area can accelerate degradation. Keeping bottled water in a cool, dark place can extend its usability and prevent the growth of mold and mildew, as suggested by KUOW. It's advisable to replace home-stored bottled water every six months.
Tap Water: Storage and Safety
Tap water, when properly stored, can remain safe for up to six months (Healthline). However, its quality can be affected by the source and plumbing system.
Summary
The longevity of water depends on its source and how it's stored. While the water molecule itself is stable, the container and storage conditions can influence its quality and safety. Regularly rotating your bottled water supply is a good practice.
