Grey Bruce Public Health is urging residents across Grey and Bruce counties who use private wells to test their drinking water for free this March 2026. The health unit recommends testing at least three times a year, especially during the spring when melting snow and flooding can wash harmful bacteria into the water supply.
The testing is provided by Public Health Ontario and looks for E. coli and total coliform bacteria. These contaminants can cause severe illness or even death if consumed. The region’s ground contains areas of karst limestone, which has natural holes and channels that allow surface water to quickly reach underground water sources.
Residents can pick up and drop off testing kits at 14 different locations throughout the area. While samples are picked up from most Grey County sites on Fridays and Bruce County sites on Wednesdays, those dropped off at the health unit’s offices in Owen Sound and Walkerton are transported to the lab daily, Monday through Friday. Samples must be turned in within 48 hours of being taken to ensure the results are accurate.
This push for testing follows a recent precautionary boil water advisory for the City of Owen Sound’s municipal system, which was lifted on March 16. Although about 12,000 tests are performed in the region each year, research shows that up to one-third of rural wells in Ontario may contain bacteria or nitrates.
The free service is only for people who get their water from private wells, as those on municipal water systems are not eligible. Once a sample is submitted, results are typically available through an online portal within two to four business days. If a test shows the water is unsafe, the health unit will provide advice on how to fix the problem.
