Twenty-nine carbon 14 measurements and 39 tritium determinations were performed on groundwater samples collected from various hydrostratigraphic units of the Eaton River Basin in the Quebec Appalachians and of the Mirabel area in the St. Lawrence Lowlands. The age of water contained in the Quaternary sand and gravel aquifers laid down in preglacial valleys of the Eaton River Basin as well as, that contained in the Cambro-Ordovician carbonate rocks underlying the Mirabel area is shown to be controlled by the permeability of the medium through which recharge occurs. Ages vary from recently infiltrated water to groundwater nearly 10 000 radiocarbon years old. The dates have been adjusted for the limestone dilution effect using an initial carbon 14 of 60% modern far carbonate rocks and 85% modern for detrital rocks.

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