Community of Cannington Municipal Groundwater Wells

The Community of Cannington is serviced by six (6) active groundwater based municipal wells. The municipal wells are designated as MW2, MW3, MW4, MW6, MW7, and MW8.

The 50-day, 1-year, 2-year, 5-year, 10-year and 25-year capture zones have been delineated for each Cannington well field at their maximum permitted capacity. The following are the approximate dimensions of each WHPA.

The WHPA for municipal wells extends southeast (MW4, MW6 and MW8) and southwest (MW3, and MW2 and MW7).

What Did We Find?

Lands within the WHPA consist of mainly open space, and to a lesser extent, agricultural, residential and industrial/commercial properties. As a protective measure, the Regional Municipality of Durham purchased lands around MW2 and MW7, where the aquifer supplying these wells is more vulnerable.

Rural residential areas within the MW3, MW4, MW6 and MW8 capture zones are not high-risk areas for contamination; however, the use of outdoor chemicals, such as fertilizers and pesticides may result in infiltration of these chemicals into the groundwater system.

Highway maintenance occurs within all capture zones and sources of contamination from de-icing salts, herbicides in right-of-ways (a strip of land reserved for a road widening, railway, etc.) and automotive wastes can potentially impact drinking water quality. Increasing levels of salts in groundwater illustrate how vulnerable the aquifer in Cannington is and how contaminants can penetrate the aquifer and degrade drinking water. Chemical water quality results in all municipal wells in the Community of Cannington meet the Ontario Drinking Water Standards (ODWS).

The types of contaminants associated with the various land uses are monitored at the municipal wells based on the current drinking water standard requirements.