Thank you for the question. This is outside my areas of expertise so I contacted the MN DNR and am copying the links that will be of interest to you. A major point is that aquatic plant management work in Minnesota is regulated via permit by the MN DNR so reaching out to the hydrology or APM (aquatic plant management) staff for the county in question as well as checking out the electronic permit application link below would be good starting places for the homeowner.
Online info and guidance:
o An overview of the aquatic plant management regulations to be aware of
o Factors influencing aquatic plant abundance
o The value of aquatic plants
o Problem aquatic plants
o Aquatic plant stewardship
o Common aquatic plants in Minnesota (divided into Algae, Emergent Plants (meaning they are rooted underwater but stick up above the water surface, think cattail), Floating-leaf plants (think water lilies), and submerged plants (those that grow entirely or almost entirely under the water surface).
Contact info and electronic permit application link:
o The link to the online aquatic plant management permit applications
o This is the contact list for the aquatic plant management staff statewide
o This is the contact list for the area hydrologist staff statewide.
Thank you for contacting Extension.