Disinfecting stored water is crucial for ensuring it remains safe to drink and use. You can effectively disinfect stored water using methods like chlorination, boiling, or UV treatment to eliminate harmful bacteria and viruses, making it safe for consumption during emergencies or for long-term storage.
Why Disinfect Stored Water?
Storing water is a smart preparedness strategy, but it’s not enough to just fill up containers. Over time, even sealed water can become contaminated. Bacteria, viruses, and other microorganisms can find their way into your stored supply, especially if containers aren’t properly cleaned or if seals fail. This is where disinfection becomes vital.
Preventing Waterborne Illnesses
Consuming contaminated water can lead to serious health issues, including diarrhea, cholera, and typhoid fever. Disinfecting your stored water kills these harmful pathogens, safeguarding your health and that of your family. This is especially important if you’re relying on stored water for drinking, cooking, or hygiene during an emergency.
Maintaining Water Quality Over Time
Even with careful storage, the quality of water can degrade. Disinfection helps to neutralize potential contaminants and extend the usability of your water supply. This ensures that when you need it most, your stored water is as safe as when you first put it away.
Effective Methods for Disinfecting Stored Water
Several reliable methods can be used to disinfect water. The best method for you will depend on your resources, the volume of water, and the situation.
1. Boiling: The Most Reliable Method
Boiling is a simple and highly effective way to kill virtually all harmful microorganisms. It requires minimal equipment and is universally recommended for emergency water purification.
- How to do it: Bring the water to a rolling boil for at least one minute. At altitudes above 6,500 feet (2,000 meters), boil for three minutes.
- What it kills: Bacteria, viruses, and protozoa.
- Pros: Extremely effective, no chemicals involved.
- Cons: Requires fuel, takes time, doesn’t improve taste, and doesn’t remove chemical contaminants.
- After boiling: Allow the water to cool naturally. Store it in clean, covered containers.
2. Chlorination: A Common and Accessible Option
Using household bleach (unscented, regular 5.25% to 8.25% sodium hypochlorite) is a widely recognized method for disinfecting water. It’s effective against many pathogens and is relatively inexpensive.
- How to do it: Add 2 drops of liquid bleach per quart (or liter) of water. For cloudy water, use 4 drops. Stir well and let stand for 30 minutes. The water should have a faint smell of chlorine. If not, repeat the dose and let stand for another 15 minutes.
- What it kills: Bacteria and viruses. Less effective against some protozoa like Cryptosporidium.
- Pros: Readily available, cost-effective, kills a broad spectrum of pathogens.
- Cons: Requires precise measurement, can impart a taste and odor, less effective in cold or cloudy water.
- Important Note: Always use plain, unscented bleach. Do not use "splash-less" or scented varieties, as they contain additives that can be harmful.
3. Iodine: Another Chemical Disinfection Option
Iodine tablets or tincture can also be used to disinfect water. While effective, it’s generally not recommended for pregnant women, individuals with thyroid problems, or for long-term use.
- How to do it: Follow the manufacturer’s instructions carefully, as concentrations vary. Typically, a few drops of tincture or one tablet per quart/liter is sufficient. Let stand for at least 30 minutes.
- What it kills: Bacteria and viruses.
- Pros: Portable, relatively quick.
- Cons: Imparts a distinct taste and odor, not suitable for everyone, less effective against Cryptosporidium.
4. UV (Ultraviolet) Treatment: Modern and Chemical-Free
UV water purifiers use ultraviolet light to damage the DNA of microorganisms, rendering them unable to reproduce and cause illness. This method is chemical-free and can be very effective.
- How to do it: Requires a UV purifier device. Water is typically passed through a chamber where it’s exposed to UV light.
- What it kills: Bacteria, viruses, and protozoa.
- Pros: Chemical-free, improves taste and odor, effective against a wide range of pathogens.
- Cons: Requires a power source (battery or plug-in), the water must be clear for UV light to penetrate effectively, and the device itself can be damaged.
Best Practices for Stored Water Disinfection
Beyond the methods themselves, a few key practices ensure your disinfection efforts are successful.
Container Preparation
Always start with clean containers. Wash them thoroughly with soap and water, rinse well, and let them air dry. If reusing containers, ensure they are specifically designed for water storage and have not previously held non-potable substances.
Water Source Quality
The cleaner the source water, the more effective your disinfection will be. If your source water is visibly cloudy or has a strong odor, pre-filter it through a clean cloth or coffee filter before disinfecting. This removes sediment that can shield microorganisms from the disinfectant.
Proper Measurement and Contact Time
Accurate measurement of disinfectants and allowing the recommended contact time are critical for effectiveness. Too little disinfectant or insufficient contact time means pathogens may survive. Always err on the side of caution.
Comparing Disinfection Methods
Here’s a quick comparison to help you choose the right method for your needs:
| Feature | Boiling | Chlorination (Bleach) | UV Treatment |
|---|---|---|---|
| Effectiveness | Very High (kills nearly all) | High (bacteria, viruses) | Very High (bacteria, viruses, protozoa) |
| Speed | Slow (requires boiling and cooling) | Moderate (30-45 minutes contact time) | Fast (depends on device flow rate) |
| Equipment | Heat source, pot | Measuring device, bleach | UV purifier device, power source |
| Cost | Fuel cost | Low (bleach is inexpensive) | Higher initial device cost |
| Taste/Odor | None | Can impart chlorine taste/odor | None |
| Chemical-Free | Yes | No | Yes |
People Also Ask
How long can I store disinfected water?
Properly disinfected and stored water can remain safe for up to six months. After six months, it’s recommended to re