Living and Working in a Vulnerable Area

There are four types of vulnerable areas, as defined by the Clean Water Act. These are areas that could have an on impact on the quality or quantity of municipal drinking water and therefore warrant a higher level of protection from potential threats.

An Intake Protection Zone (IPZ) is the region, made up of both water and land, surrounding a surface water intake pipe. The size of an Intake Protection Zone is determined by the time that it takes for a spill in or near the water to flow into the water intake pipe.

There are three sources of municipal drinking water from surface water:

Wellhead Protection Areas (WHPAs) immediately surround municipal drinking water wells. The size of a Wellhead Protection Area depends on the topography, the amount of water pumped from the well, the type of soil surrounding the well, and the direction and speed of the groundwater flow.

Greater Sudbury has 24 municipal drinking water wells located in:

Significant groundwater recharge areas (SGRA's) and highly vulnerable aquifers (HVA's) are areas that are important for groundwater flow and recharge and are identified by factors such as the type of soil and land cover. They have lower vulnerability scores and only low threats can be identified in these areas.

To see maps of the vulnerable areas look here or here


Search a location to see if it is in a vulnerable area – that is, close to a municipal drinking water well or intake. In these areas certain land or water activities, if left unchecked, could pollute the water supply. Onlinesearch

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