The state Departmentof Environmental Conservation has conducted studies of the Mohawk River basin since the 2006 flood and has been working on a program involving soil and water conservation districts and the Army Corps of Engineers.
The Vermont Departmentof Health said it has found radioactive tritium in the Connecticut River, which probably leaked from the nearby Vermont Yankee nuclear power plant.
Police divers, fire department officers and villagers were searching for the missing passengers in the river, known for stretches of swift-flowing rapids.
South East Water has applied to the Department for Environment, Food and Rural Affairs (Defra) to increase the amount of water it abstracts from the River Ouse.