ABSTRACTSince 1961, control over water‐supply interference problems in the Province of Ontario has been provided under The Ontario Water Resources Commission Act. A section of The Act requires persons taking more than 10,000 imperial gallons per day of water for purposes other than domestic, stock or fire‐fighting to have a permit and to take the water in accordance with specified terms and conditions. Construction of some new wells, sewers, and roads to meet the needs of urban development has caused interference with both ground‐ and surface‐water supplies. In cases of serious interference, the Commission has required that steps be taken to restore water supplies or prevent continued interference. Two cases are described where municipalities in the Toronto area restored supplies to overcome serious interference with several private wells and streamflow during testing and operation of a 500‐imperial gpm municipal well adjacent to a normally effluent stream, and varying degrees of interference with private wells caused by dewatering at rates up to 2000‐imperial gpm for the installation of a
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