Drinking Water Source Protection
York Region provides clean, safe, reliable drinking water to more than one million people. It originates from three sources: Lake Ontario, Lake Simcoe and groundwater wells within York Region. Groundwater wells draw water from underground aquifers made up of water, soil and rock.
Everyone plays an important role in protecting drinking water sources.
What is Source Water Protection?
Source Water Protection is a program legislated by the Province of Ontario to protect municipal drinking water sources from contamination or over use. The program protects water supplies from threats within vulnerable areas now and into the future.
- View this map to see if your home, farm, business or land development project is located in or near a vulnerable area
- Learn more about the Safe Drinking Water Act (2002)
- Learn more about the Clean Water Act (2006)
What Can Threaten Drinking Water Sources?
Activities that may pose a threat to the quality and quantity of ground and surface water include:
- Municipal: waste, sewage, stormwater, road salt
- Agricultural: biosolids, manure, commercial fertilizer, pesticides, livestock grazing
- Commercial: fuel, organic solvents, dense non-aqueous phase liquids (DNAPLs)
- Residential: septic system and fuel storage
- Water taking (activities that take large quantities of water from the ground)
What can you do to Protect Drinking Water Sources?
- View this map to see if your home, farm, business or land development project is located in or near a vulnerable area.
- If you are located in a vulnerable area and you are:
- embarking on a development, opening or renovating your business, you may be required to get a Section 59 Notice (Source Water Protection Permit)
- an existing business in a vulnerable area, you may require a Risk Management Plan
- You may also be required to complete a Source Water Impact Assessment and Mitigation Plan or Contaminant Management Plan before you proceed.
- Get familiar with local drinking water source protection plans:
- Contact a York Region Risk Management Official or Risk Management Inspector at @email
For more information, please contact @email
What else can you do?
There are many simple things residents can do to protect drinking water sources, including:
- Properly maintain your septic system
- Responsibly handle and dispose of chemicals like home heating fuel, paint remover, paints and stains, adhesives, degreasing products and pesticides
- Follow Technical Standards and Safety Authority (TSSA) annual maintenance requirements for fuel oil storage tank systems and check for leaks and spills
- Properly dispose of medications and personal care products — medications can be returned to a participating pharmacy or a York Region Household Hazardous Waste Depot for safe disposal
Businesses can also:
- Find ways to reduce your water usage
- Develop a Risk Management Plan that can minimize the risk of a spill or leak
- Find out if you need a Source Protection Permit by contacting @email
- Safely handle and dispose of chemicals
- Consider low-impact development practices when planning new construction to get run-off from roofs and parking lots back into the ground
Farmers can also protect drinking water sources by:
- Staying up-to-date with best practices of storing and applying manure, pesticides and fertilizers
- Creating or updating a Nutrient Management Plan with practices to protect drinking water sources
Landowners, including farmers, can apply for funding for projects that protect municipal drinking water through the Landowner Environmental Assistance Program in the Lake Simcoe watershed and the Rural Clean Water Program in the Toronto and Region watershed.
York Region Protects Drinking Water Sources by:
- Conducting a groundwater monitoring program
- Defining Wellhead Protection Areas for all municipal water supply wells
- Defining the Intake Protection Zones for Lake Simcoe and Lake Ontario
- Conducting studies to better understand and manage municipal groundwater supplies
- York Region is a partner agency in the Oak Ridges Moraine Groundwater Program, integrating water related data from various partner agencies across the moraine. The Program website provides public access to water and geology related data such as maps of wells, water table mapping and geologic mapping
- Preparing source protection plans
- Reviewing all development applications to make sure that drinking water sources are protected
- Helping businesses identify and implement risk management measures
Where We Are Vulnerable
York Region’s water supplies are most vulnerable in Wellhead Protection Areas and Intake Protection Zones. Wellhead Protection Areas are the areas around drinking water wells. Intake Protection Zones are the areas around surface water (lake) intakes.
- View the Drinking Water Protection fact sheet to learn more
Wellhead Protection Areas
The length of time that it takes for a contaminant to reach the well depends on the distance from the well and the thickness and type of sediment between the surface and the aquifer. An aquifer is an underground layer of sediment or rock that is full of water that can be accessed by a well or spring. Generally, the concern that contaminants from human activity could enter the water supply is highest in the areas close to the wells.
Wellhead Protection Areas (WHPA) are the areas around drinking water wells. It takes a drop of water 25 years to travel to the municipal well from this area once it is in the aquifer. WHPAs are determined by soil types (i.e. water travels faster through sand than clay) and water pumping rates.
Intake Protection Zones (IPZ) are the areas around surface water (lake) intakes. It takes 2 hours for water to reach the intake pipe from this zone. Intake protection zones are determined by wind, water currents, water temperature and water pumping rates.
Highly Vulnerable Aquifers (HVA) are portions of the landscape that are vulnerable to contamination, based on depth to the aquifer and type of materials above it, for instance, clay versus sand or fractured rock.
Significant Groundwater Recharge Areas (SGRA) help maintain water levels in drinking water supply aquifers. These are areas with porous soils such as sand or gravel that have higher than average infiltration rates and are hydraulically connected to a groundwater supply well.
WHPA-Q / Recharge Management Area (WHPA-Q/RMA) are identified to ensure York Region has a sustainable supply of groundwater. A water quantity risk assessment, identified a groundwater recharge management area. The assessment considered drought, future water demand, land-use change and population growth.
View Recent News Articles
- Environment Resources
- Ontario Water Resources Act
- South Georgian Bay Lake Simcoe Source Water Protection
- Credit Valley, Toronto and Region, Central Lake Ontario Drinking Water Source Protection
- Source Protection Information Atlas (SPIA) offers a provincial view of source water protection
- Safe DrinkingWater Act (2002)
- Clean Water Act (2006)
- Land Development Resources
- Oak Ridges Moraine Groundwater Program
- Non-Potable Requests
- Environmental Site Assessment