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Water Testing

​Flooding and Potential Water Contamination

Flooding, snowmelt and increased rainfall can affect the quality of well owners’ drinking water. Test your drinking water at least weekly during periods of high water levels to ensure your water does not contain the bacterial indicators of contamination.

Until you have an acceptable test result, boil your water before consuming it in any way (including use in food preparation, brushing teeth, etc.) or use bottled water or water from a municipal supply if available. Find out how to submit a water sample


​Holiday Schedule for Private Citizen Drinking Water Sample Drop-off

The Public Health Ontario laboratory is closed on: Friday March 30

The last day to submit a water sample for testing before the holiday is: Wednesday March 28

We return to the regular drop-off schedule on Monday April 2.

If you have concerns about your water quality, contact your local public health unit.

Drinking Water Testing

This information is for people who own their own source of a private drinking water system that serves a single household, such as a well. If you are an owner or operator of a municipal drinking water system (O.Reg. 170/03), contact the Ministry of Environment and Climate Change. For small drinking water systems (O.Reg. 319/08), contact your local public health unit.

Public Health Ontario provides testing for E. coli and total coliforms for private drinking water system owners. For all other environmental testing, including testing for chemical contaminants, please consult with your local public health unit.

Your well water can affect the health of everyone who drinks it.  Here are steps you can take to reduce the risk of consuming contaminated water:​


1. Know Who to Contact
2. Test Your Well Water
3. Protect Your Well Water
More » More »

Notice to PHOL laboratory private citizen drinking water testing clients:

Water sample drop-off is now available at our new location at the 17th Floor front reception at 661 University Avenue (Monday-Friday, 9:00am-4:00pm). Water samples can still be submitted in the main lobby of our previous location at 81 Resources Road (Monday-Friday, 8:00am-2:00pm) until further notice.

In-person report pick-up is no longer available at 81 Resources Road. In-person report pick-up is now located at the 17th Floor front-reception at 661 University Avenue (Monday-Friday, 9:00am-4:00pm). Please note a release form may be required.

Results are also available by mail or by telephone (1-877-723-3426 or TTY: 1-866-828-2238). Please see the “Get your drinking water test results” web page for more details.

For more information please contact the PHO Customer Service Centre at 416-235-6556 / toll-free 1-877-604-4567 or

Page last reviewed:
Page last updated: 12/03/2018 2:15 PM
Uncontrolled print copy. Valid only on day of Print: [date]
Page updated on [date/time] 12/03/2018 2:15 PM
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