What Is Source Water Protection?
Source Water Protection is about keeping drinking water safe by preventing contamination at the source — before it reaches a tap or a well.
In Ontario, this approach focuses on managing activities that could affect rivers, lakes, and groundwater that supply drinking water.
Why Source Water Protection Exists
Once drinking water becomes contaminated, it can be very difficult, costly, or even impossible to clean up — especially groundwater.
Source Water Protection helps reduce these risks by identifying sensitive water sources and putting preventative measures in place.
Why Protect the Source?
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Protects public health: Clean source water helps keep drinking water safe for communities today and in the future.
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Prevention is more reliable than treatment: Water testing and treatment systems are important, but they are not perfect and cannot catch or remove every contaminant.
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More cost-effective than cleanup: Preventing contamination is far less expensive than treating polluted water or responding to contamination events.
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Some contaminants can’t be removed: Many chemical compounds are difficult or impossible to fully treat once they enter water sources.
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Essential for private well users: Many Ontarians, especially in rural areas, rely on private wells or surface water intakes. Protecting source water may be their only line of defense against contamination.
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Supports future growth: Reliable, protected water sources allow communities to plan responsibly for future development.
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Protects water for other uses: Clean, abundant water also supports recreation, ecosystems, and other everyday uses beyond drinking water.
How Source Water Protection Works
1
Identifying Vulnerable Areas
Protecting drinking water starts with identifying areas that are more sensitive to contamination, such as locations near municipal wells, surface water intakes, and groundwater recharge areas. Understanding where these vulnerable areas are helps focus protection efforts where drinking water sources are most at risk.
2
Identifying Drinking Water Threat Activities
Everyday activities on the land can affect drinking water if spills, leaks, or runoff occur. Understanding which activities could pose a risk helps identify where extra care or safeguards may be needed to prevent contamination.
3
Managing Those Threats
Some water sources are more vulnerable than others. In these areas, additional measures may be used to reduce risk and protect drinking water, while still allowing land uses to continue safely.
What This Looks Like
Source Water Protection focuses on practical, preventative actions that reduce the risk of contamination before it reaches drinking water sources.
In the Thames–Sydenham region, this can include:
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Identifying vulnerable areas around municipal wells and surface water intakes where contaminants could reach drinking water more quickly.
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Encouraging good practices for everyday activities such as septic system maintenance, fuel and chemical storage, and fertilizer use.
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Managing higher-risk activities in sensitive areas to reduce the likelihood of spills, leaks, or runoff reaching water sources.
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Working with property owners and businesses to understand risks and find practical ways to protect drinking water while allowing activities to continue.
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Planning for growth and emergencies by considering drinking water protection in land-use planning and spill response.
These measures help protect drinking water sources quietly and effectively — often without people noticing, which is a sign the system is working.
