Is 7 day old water safe to drink?

No, it is generally not safe to drink water that has been sitting out for 7 days. While it may not immediately cause harm, it poses significant health risks due to potential bacterial contamination and the degradation of water quality over time.

Is 7-Day-Old Water Safe to Drink? Understanding the Risks

You might be wondering if that bottle of water you forgot about is still okay to drink. The short answer is: it’s best to avoid it. While water itself doesn’t "spoil" in the same way food does, storing water for extended periods, especially if it’s been opened or exposed to the environment, can lead to serious health concerns. Let’s dive into why.

Why Storing Water for a Week Isn’t Recommended

Water left standing for seven days, particularly if it’s been previously opened or is in an unsealed container, becomes a breeding ground for microorganisms. Even sealed bottles can degrade over time, potentially leaching chemicals.

The Danger of Bacterial Contamination

When you open a water bottle, you introduce bacteria from your mouth and the surrounding air. These bacteria multiply rapidly in the stagnant water. Over seven days, these colonies can grow to levels that can cause gastrointestinal issues like nausea, vomiting, and diarrhea.

• E. coli: Often found in fecal matter, it can contaminate water sources.
• Salmonella: A common cause of food poisoning, it can also be present in contaminated water.
• Giardia: This parasite can cause severe stomach cramps and dehydration.

These are just a few examples of the harmful pathogens that can thrive in unrefrigerated, old water.

Chemical Leaching from Plastic Bottles

Many people store water in plastic bottles. While BPA-free plastics are common, prolonged exposure to heat or sunlight can still cause chemicals to leach from the plastic into the water. Over seven days, this leaching can increase, potentially impacting your health.

• BPA (Bisphenol A): Though many bottles are now BPA-free, older or lower-quality plastics might still contain it.
• Phthalates: These chemicals can also leach from plastic and are linked to various health problems.

While a single instance might not cause severe harm, consistent consumption of such water is not advisable.

How Long is Water Really Safe to Drink?

The safety of drinking water depends heavily on its source, storage, and whether the container has been opened.

Unopened Bottled Water

Commercially bottled water typically has a long shelf life, often marked by an expiration date. This date is more about the quality of the plastic bottle degrading than the water itself becoming unsafe.

• Best By Date: This date indicates peak quality. Water stored properly can be safe to drink for years past this date.
• Storage Conditions: Keep unopened bottles in a cool, dark place away from chemicals and direct sunlight.

Opened Bottled Water

Once opened, the clock starts ticking much faster. It’s generally recommended to consume opened bottled water within 24 to 48 hours, especially if it’s not refrigerated. Refrigeration can extend this slightly, but it’s still best to consume it within a few days.

Tap Water

Tap water, when properly treated and from a reliable source, is generally safe to drink immediately. However, if tap water sits in pipes or containers for an extended period, it can pick up contaminants.

• Flushing Taps: Running your tap for a minute can help clear out stagnant water that may have accumulated in your home’s plumbing.
• Storage: If storing tap water, use clean, food-grade containers and keep them in a cool, dark place.

Practical Tips for Safe Water Storage

Ensuring you have safe drinking water on hand is crucial, especially during emergencies or when traveling.

Best Practices for Storing Water

• Use Food-Grade Containers: Opt for BPA-free plastic containers or glass bottles specifically designed for water storage.
• Keep Them Sealed: Ensure containers are tightly sealed to prevent contamination.
• Store in a Cool, Dark Place: Avoid direct sunlight and heat, which can degrade plastic and encourage bacterial growth.
• Rotate Your Stock: For emergency preparedness, rotate your stored water every 6-12 months to ensure freshness.

What to Do with Old Water

If you discover water that has been sitting out for a week or more, it’s best to err on the side of caution.

• Discard It: The safest option is to pour it down the drain.
• Repurpose It: Use it for watering plants or other non-drinking purposes.

When is Stored Water Safe for Emergencies?

For emergency preparedness, it’s recommended to store water in clean, food-grade containers.

Note: This table provides general guidelines. Always follow recommendations from local health authorities for emergency water storage.

Frequently Asked Questions About Drinking Old Water

Here are answers to some common questions people have about the safety of drinking water that has been stored for a while.

### Can I get sick from drinking old bottled water?

Yes, you can get sick from drinking old bottled water, especially if it has been opened. Bacteria introduced after opening can multiply over time, leading to gastrointestinal illnesses. Even unopened bottles can degrade, potentially leaching chemicals.

### How can I tell if water has gone bad?

Water doesn’t typically show obvious signs of spoilage like food. However, if it has a cloudy appearance, an unusual smell, or a strange taste, it’s a strong indicator that it has become contaminated and is unsafe to drink.

### Is it safe to drink water that sat in a hot car for a week?

No, it is definitely not safe to drink water that sat in a hot car for a week. The heat accelerates the leaching of chemicals from the plastic bottle into the water. It also significantly increases the risk of bacterial growth if the bottle was ever opened.

### What is the best way to store water for emergencies?

The best way to store water for emergencies is in clean, food-grade containers (like BPA-free plastic or stainless steel) that are tightly sealed. Store them in a cool, dark, and dry place, and