It supplies some of the water needs of the upper Conwy Valley, including Betws-y-coed and Llanrwst [REF].
The pH level of the lake is reported as pH 7.5257 on average, with calcium carbonate rates at 53.7 mg/l, hardness 3 °GH, free chlorine at 0.2853 mg/l and total chlorine at 0.354 mg/l [REF].