Emergency Water Turned Green in Storage: A Real-World Storage Problem



If you have an emergency water container and the water has a strange green tint, don't use it for drinking. If you have ever discovered green algae in stored water, you may wonder how it happened, whether your water is contaminated, and if it can still be used safely. 

This is particularly concerning if water has been stored in a garage, shed or other area where temperatures fluctuate. A water filter for emergency disaster preparedness can also provide another option when stored water becomes questionable. 

This guide outlines the causes of stored water becoming green, how to identify warning signs, what to do with contaminated water, and how to improve the reliability of your emergency water storage. 

Quick Answer 

Do not assume that it is safe to drink the water if it is green in color. Color can indicate biological growth. Water also undergoes changes in appearance because of sediment, residue, minerals or changes to the container.

Treat water with caution if you notice green algae in stored water. If it smells strange, has floating objects, slime, or excessive cloudiness. Check the container and think about using an alternative water supply or a different treatment method. 

Key Takeaways

  • Light and unsuitable storage conditions can change stored water.

  • Algae can develop in stored water under favorable conditions like light exposure.

  • Containers can be exposed to heat and temperature changes in garages.

  • Do not assume that water treated before storage is safe to drink.

  • Storage problems can be avoided with proper containers and frequent inspections.

  • Filters can be used to prepare water, but they can have different capabilities. 

Why Did Stored Emergency Water Turn Green?

Biological growth is one possible cause of a greenish colour in the water. Algae and other microorganisms can grow in stored water. If it is exposed to light and a suitable environment. This is one of the reasons that stored water algae can pose a problem after a period of storage.

Algae presence is not necessarily indicated by green color, however. The appearance of the water can also be impacted by sediment, residue, minerals, or anything related to the container.

When green algae is seen in stored water, reflect on how the water was stored, if it was exposed to the sun and if it was kept closed properly. 

Why Garage Storage Can Create Problems

A garage may appear to be a convenient location for 5-gallon emergency water, but the temperature can change drastically. Some containers placed near windows or garage doors also get some exposure to sunlight.

Do not store any emergency water in direct sunlight or in extreme heat and keep it away from chemicals, including gasoline and pesticide.

When you are using garage water storage, check your containers regularly rather than waiting until there is an emergency to find out there's an issue. 

Green Water vs. Normal Sediment or Container Changes

Not every change in stored water means algae or contamination. Use the table below to understand what you may be seeing:

What You Notice

What It May Mean

What to Check

Green or greenish water

May indicate biological growth after light exposure or warm storage.

Look for odor, floating material or cloudiness

Sediment at the bottom

Particles or minerals may settle over time.

Check whether particles remain at the bottom and whether other changes are present

Cloudy water

May result from suspended particles, minerals, or other changes.

Check for unusual odor or visible growth

Particles or residue

May come from the water or storage container.

Inspect the container for residue, damage, or deterioration

Unusual odor or slime

Shows an undesirable change in the water.

Avoid drinking it until the cause and appropriate treatment are established

When you are unsure what caused the change, do not rely on appearance alone to determine whether the water is safe. 

What to Do If Stored Emergency Water Turns Green

Avoid drinking water unless you know it's safe. Check the container and whether it was exposed to sunlight, excessive heat or poor storage.

If you suspect contamination, use a suitable treatment method for the contaminant you suspect. The treatments are not the same and will vary in what they can treat. Therefore, be guided by trusted information and the instructions offered on the packaging.

If the water have fuel, toxic chemicals or other hazards, use an alternate safe water source instead of normal water treatment. 

How to Store Emergency Water More Reliably

If you have one container issue, then it is time to audit your entire collection.  Always store in appropriate food containers, close containers tightly, store away from light, and store in a cool place, if possible.

Label containers with storage dates and check for leaks, damage, changes in color or other changes periodically. These habits can help reduce emergency water storage problems.

Where Filtration Fits Into Emergency Water Planning

Emergency preparedness isn't all about stored water! In the event of a disaster, supplies may become questionable, run out or be unavailable.

An emergency water filter can provide another treatment option for certain water sources. JugFilter can be used alongside an emergency preparedness kit at home, outdoors, or on the go.

When there is limited stored water, an emergency water filter can be used. But not all filters are the same, so make sure you know what your filter removes. 

Conclusion

If you find green water in your emergency supply, check the storage conditions, but don't assume the water is safe to drink. Stored water can change due to light, temperature changes, improper containers and other reasons.

You can make your emergency water plan more reliable if you have regular inspections, use the right containers, keep it away from the sun, and have a backup treatment option.

If you are concerned about water storage for preppers, pairing that with a portable water filter can be an additional preparedness measure.

Want a convenient portable solution for fresher drinking water? Try out JugFilter and include it on your emergency kit list. 

Frequently Asked Questions 

Why did my stored emergency water turn green?


Green colored water can be caused by light exposure, biological growth, storage conditions, sediment, residue or container change.


Can stored water grow algae?


Yes. Algae or other biological growth can form in stored water, especially if it is exposed to light.


Is green water in a 5-gallon jug safe to drink?


Should not be assumed to be safe. Some of the reasons for green coloring may be legitimate and some may not, so the water should be treated and/or replaced accordingly.


How should emergency water be stored in a garage?


Always store in appropriate food-grade containers, ensure containers are tightly closed, and avoid direct sunlight, excessive heat and chemicals.


Can a water filter make green stored water safe?


Not necessarily.  Different filters can remove different contaminants and no single filter removes all microorganisms and chemical pollutants. 

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