Water is essential for life, but how long can it sit before it’s no longer safe to drink? Generally, properly stored sealed bottled water can last indefinitely, but once opened, it’s best consumed within a few days to a week. Tap water, when stored correctly, is also safe for a limited time, but factors like container type and storage conditions significantly impact its longevity.
How Long Can Water Sit Until It Goes Bad? Understanding Shelf Life
The question of "how long can water sit until it goes bad?" doesn’t have a single, simple answer. It depends heavily on whether the water is sealed or opened, its source, and the container it’s stored in. While water itself doesn’t "spoil" like food, it can become contaminated over time, making it unsafe for consumption.
Sealed Bottled Water: Indefinite Shelf Life?
Sealed, commercially bottled water is designed for long-term storage. The plastic bottles used are typically made from PET (polyethylene terephthalate), which is considered safe for storing water. The water inside is usually purified and sealed in a sterile environment.
- Indefinite Storage: In ideal conditions, sealed bottled water can theoretically last forever. The plastic may degrade over very long periods, potentially leaching chemicals, but this is a concern for extreme durations.
- Best By Dates: You’ll often see a "best by" or "expiration" date on bottled water. This date is primarily related to the quality of the plastic and potential minor taste changes, not necessarily safety. The water itself remains safe to drink.
- Storage Conditions Matter: Keep bottled water away from direct sunlight and extreme heat. These conditions can degrade the plastic and affect the water’s taste.
Opened Bottled Water: A Shorter Timeline
Once a bottle of water is opened, the clock starts ticking on its freshness. Exposure to air and potential contaminants from handling can lead to a decline in quality and safety.
- Refrigeration Recommended: For opened bottled water, it’s best to refrigerate it and consume it within 3 to 7 days. This helps slow down the growth of any bacteria that might have entered the bottle.
- Taste and Odor: You might notice a change in taste or odor after a few days, which is a sign that it’s time to discard it.
- Avoid Reusing: It’s generally not recommended to refill single-use plastic water bottles, as they are not designed for repeated use and can harbor bacteria.
Tap Water Storage: What You Need to Know
Tap water, while safe to drink directly from the faucet, requires proper storage if you plan to keep it for later use, especially during emergencies.
- Container Choice is Key: Store tap water in food-grade plastic containers, glass, or stainless steel. Avoid containers that previously held non-food items, as residues can contaminate the water.
- Purification for Longevity: If you’re storing tap water for an extended period (e.g., emergency preparedness), it’s advisable to purify it first. This can involve boiling, using water purification tablets, or a filtration system.
- Storage Duration: Properly stored and purified tap water in sealed containers can last for up to 6 months. After this period, it’s recommended to replace it to maintain quality.
How to Store Tap Water Safely
Storing tap water effectively is crucial for ensuring its safety and potability over time.
- Clean Containers Thoroughly: Wash your chosen containers with soap and water. Rinse them well to remove any soap residue.
- Fill Containers: Fill the containers to the very top, leaving no air space. This minimizes contact with air, which can introduce contaminants.
- Seal Tightly: Securely seal the lids on your containers.
- Store in a Cool, Dark Place: Find a cool, dark, and dry location for storage, away from direct sunlight and potential chemical fumes.
- Label and Date: Clearly label each container with the date it was filled. This helps you track its age and when it needs to be replaced.
Factors Affecting Water’s Shelf Life
Several factors can influence how long water remains safe and palatable. Understanding these can help you make informed decisions about your stored water.
- Container Material: As mentioned, food-grade plastic, glass, and stainless steel are best. Porous materials or those not intended for food storage can leach chemicals or harbor bacteria.
- Temperature: Warmer temperatures accelerate the growth of microorganisms. Storing water in a cool environment significantly extends its shelf life.
- Light Exposure: Direct sunlight can degrade plastic containers and promote algae growth. Always store water in a dark place.
- Initial Purity: The cleaner the water is when stored, the longer it will remain safe. Filtered or purified water will generally last longer than untreated water.
- Sealing Quality: A tight seal is critical to prevent airborne contaminants from entering the container.
When to Discard Stored Water
Even with proper storage, there are signs that water may no longer be safe to drink. Trust your senses.
- Cloudiness: If the water appears cloudy or murky, it’s a sign of potential contamination.
- Unpleasant Odor: Any off-putting smell, such as musty, chemical, or rotten odors, indicates that the water is compromised.
- Strange Taste: If the water tastes unusual or unpleasant, do not drink it.
- Container Issues: If the plastic bottle is cracked, bulging, or shows signs of degradation, discard the water. For reusable containers, check for any signs of mold or damage.
People Also Ask
### How long is tap water good for in a plastic bottle?
Tap water stored in a sealed, clean plastic bottle in a cool, dark place can be good for up to six months. However, once opened, it’s best to consume it within 3 to 7 days, especially if not refrigerated. Always use food-grade plastic containers.
### Can you get sick from drinking old bottled water?
While bottled water doesn’t "spoil" in the traditional sense, drinking very old bottled water, especially if stored improperly, carries a risk. The plastic bottle can degrade over time, potentially leaching chemicals into the water. Furthermore, if the seal is compromised or the bottle is refilled, bacteria can grow, leading to illness.
### Does boiling water make it last longer?
Boiling water kills most bacteria and other microorganisms, making it safer to drink. However, boiling itself does not extend the shelf life of water indefinitely. Once cooled and stored, it can still become re-contaminated if not kept in a clean, sealed container. Properly stored boiled water can last for about six months.