Alliston Aquifer

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In 1976, The Alliston Aquifer was the first groundwater complex to be mapped by the Ontario Ministry of the Environment, based on its "major extent and significant potential for development". It extends from Georgian Bay and beneath Lake Simcoe. The jagged line at the south end indicates that the aquifer is thought to continue south of the protected Oak Ridges Moraine. The preservation of the aquifer is important since it is used as a primary water source by numerous municipalities and also discharges into creeks and rivers which eventually flow into Georgian Bay, Lake Simcoe, Lake Scugog and Lake Ontario.

* This overlay on this map is derived from Hydrogeologic Map 77-1 issued by the Ontario Ministry of the Environment in 1977.