Best Practices for Non-Municipal Drinking Water

What are the risks?

Flooding can affect water quality, and this is a particular concern for rural residents in Ontario on private drinking water systems. Be aware that flooding may cause contamination of private water sources, such as wells.

What should I do?

• If you use a private well for your water supply, contact your local public health unit for water quality information and to have your water tested by Public Health Ontario. There are eleven Public Health Ontario laboratory sites that test private drinking water supplies for indicators of bacterial contamination. In addition to bacterial contaminants, flood waters may carry chemical and other contaminants in to your well. Should you wish to test for chemical contaminants, a list of accredited laboratories offering chemical testing in Ontario drinking water can be found at: https://www.ontario.ca/document/list-licensed-laboratories.
• In the event that your water is contaminated, or you suspect contamination because of heavy rainfall or flooding, consider using bottled water or a municipal supply, if available. Do not use contaminated water for drinking, food preparation, or for brushing your teeth. Private well water supplies are vulnerable to contamination events at any time and should be tested frequently.

IMPORTANT: Fuel and other chemical releases and spills are common during flood events. If your water smells like fuel or has a chemical odour or if you live in an area where the potential for a release of fuels, pesticides, or other hazardous chemicals is high, contact your local health unit for specific advice. Until you know the water is safe, use bottled water or some other safe supply of water.

Flooding and a private sewage system

If your property is at risk of a flood, or flooded, consider the effect on your private sewage system. A flooded sewage system will not function properly and can cause problems such as:

• sewage backup in your home, and;
• contamination of your water supply. 

In the event of a flood, contact your local public health unit for guidance regarding how to manage your private sewage system during the flood period.

For more information, please view this PDF from the HKPR District Health Unit.