The state of Massachusetts is looking to require Holtec, the owners of the Pilgrim nuclear power plant, to analyze water evaporation at the plant for potential air pollution as the unit is decommissioned.

At a hearing this week with a state Department of Environmental Protection panel, officials said that more study is needed on nonradioactive contaminants in about 1 million gallons of water that Holtec has proposed discharging into Cape Cod Bay.