The Department of Natural Resources regulates dredging activities, but dredging work is subject to the MPCA's water quality standards (see Minnesota Rules chs. The type of dredging operation, its location, and contaminants in the dredged material will determine how the MPCA regulates the project. Carriage water and hydrostatic water from hydraulic or mechanical dredging processes, and stormwater runoff from sites where dredged material is stored or managed, can cause harm if it reaches surface water or groundwater. For example, sediment might be dredged from lake or river bottoms to accommodate shipping traffic in a commercial port or recreational boating in a marina.ĭredged material can affect the environment. Dredged material is material excavated at or below the ordinary high water level of waterbasins, watercourses, public waters, or wetlands (defined in Minn.
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