Date: June 17, 2019

Mainly cloudy. 40 percent chance of showers late this evening and after midnight. Wind northeast 20 km/h becoming light near midnight. Low 12.

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10.6C

Environment Canada
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Safe Water

Drinking Water

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Safe Water - Emergencies

This page was reviewed or revised on Wednesday, May 24, 2017 3:19 PM

Boil Water and Drinking Water Advisories


Boil Water Advisories

What is a Boil Water Advisory and why is it issued?

A Boil Water Advisory (BWA) is a public announcement issued by the Medical Officer of Health when conditions indicate the water is not safe for human consumption due to microbial contamination, unless treated or boiled.

How do I use water during a Boil Water Advisory?

During a Boil Water Advisory, it is not safe to use water directly from your tap unless it is boiled (a rolling boil for 1 minute) or treated by adding 8 drops (1.25 mL or ¼ tsp) of chlorinated household bleach per gallon (4.5 L) of water.

DO NOT use untreated water for:

  • Drinking
  • Making infant formula or juices
  • Cooking
  • Making ice
  • Washing fruits or vegetables
  • Brushing teeth
  • Bathing small children

Boiled/treated or bottled water can be used for these tasks.

What do I do after a Boil Water Advisory has been lifted?

The Boil Water Advisory will be lifted when the Medical Officer of Health is confident the water is safe to use and no longer poses a threat to public health. As a rule, a Boil Water Advisory is lifted when the original problem with the water supply has been fixed and two (2) sets of water samples, taken 24-48 hours apart, are OK.

  1. Run cold water taps and drinking water fountains for at least 1 minute before using the water.
  2. Replace water filters used to filter untreated water.
  3. Flush all garden hoses by running water for 1 minute.
  4. Run water softeners through a regeneration cycle.
  5. Drain and refill hot water heaters set below 45°C (normal setting is 60°C).

Drinking Water Advisories

What is a Drinking Water Advisory and why is it issued?

A Drinking Water Advisory (DWA) is a public announcement issued by the Medical Officer of Health when boiling or disinfecting the water will not render it safe for consumption (ex. chemical contamination). An alternate water source, such as bottled water, would need to be used.

What should be done during a Drinking Water Advisory?

If a Drinking Water Advisory has been issued, do not use water from the tap for drinking, preparing food, making beverages or ice cubes, washing foods, or brushing teeth. Use a safe alternate water source instead, such as bottled water or commercially treated water.

What do I do after a Drinking Water Advisory has been lifted?

The Drinking Water Advisory will be lifted when the health unit's Medical Officer of Health is confident the water is safe to use and no longer poses a threat to public health. As a rule, a Drinking Water Advisory is lifted when the original problem with the water supply has been fixed and two (2) sets of water samples, taken 24-48 hours apart, meet the water quality standards.

Boil Water Advisory Resources

Boil Water Advisory - Guidelines for Dental Offices
Boil Water Advisory - How to Use Water During a Boil Water Advisory
Boil water Advisory - Mandatory Guidelines for Public Pools, Spas, Wading Pools
Boil Water Advisory - Mandatory Guidelines for Retail Food Services
Boil Water Advisory - Washing Dishes and Countertops