Boiling water for 1 minute is always the best way to disinfect water during a boil water advisory. During power outages or other situations (e.g., extreme weather), you might not be able to boil water to make it safe. If this happens, you can:
Cryptosporidium. Sometimes there may be a risk of parasites, but it will be very hard to know this, especially in an emergency. If boiling isn’t possible, the best way to make water safe is with a combination of treatments.
When you use chlorine or iodine to disinfect water, use another treatment to remove parasites if possible. Use one of the methods below to do this. You have to treat for parasites
before you disinfect with chlorine or iodine.
How do I disinfect my water with chlorine?
You can chlorinate your water with water purification tablets or bleach.
Water Purification Tablets
You can buy the tablets from most outdoor supply or camping stores. Follow the directions on the package.
To chlorinate your water using bleach, you will need:
If your water is
If your water is
How do I disinfect my water with tincture of iodine?
Don’t use iodine for more than
3 weeks each summer (in controlled doses) because there is a risk of thyroid problems and iodine sensitivity.
Don’t drink water disinfected with iodine if you:
To disinfect water with iodine, you need tincture of iodine (2% in liquid form) or iodine tablets. If you use tablets, follow the directions on the package. If you use liquid iodine, follow the directions listed below. You can buy iodine at most drugstores and some outdoor supply or camping stores.
Liquid iodine works best when added to warm water at a temperature of 20 ˚C (68 ˚F).
If you have any questions about your water, call an
Environmental Public Health Office in your area.
Current as of: September 15, 2017
Author: Environmental Public Health, Alberta Health Services
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