Lake Minnetonka Conservation District - To protect and preserve Lake Minnetonka



Common Topics

The LMCD receives many questions about the environment, safety, and other items related to Lake Minnetonka. Information and resources for the of the most commonly asked items are provided below.

Algae, Slime, and Blue-Green Algae

Many of the algal blooms are not harmful and more of nuisances. However, the blue-green algae (a bacteria) can become harmful to people and pets. The following resources provide information about the most common types of algae and how to identify them.

Carbon Monoxide Alarms and Watercraft

Carbon monoxide (CO) is an odorless, colorless, tasteless gas that can be toxic even in very small quantities since its effects are cumulative over time. Whether inside, outside, underway or anchored, passengers of many types of boats with a motor can quickly become victims of CO poisoning. A quick inspection every time you operate your boat can save a life, carbon monoxide poisonings are preventable. Some new regulations go into effect May 1, 2018.  Please visit the MN DNR website to determine if your watercraft is in compliance with the new regulations and to learn ways to prevent CO poisoning. Visit

Electric Shock Drowning (ESD)

ESD is a drowning resulting from paralysis caused by electrical currents in the water.  This happens when electricity that is installed around boats and docks leaks into the water.  Humans and animals have been harmed or died due to ESD.  To prevent ESD, it is recommended that you do not enter water around boats and docks using electrical power. The following resources provide information about the dangers and prevention of Electric Shock Drowning (ESD).  If you have any questions, please contact Ed Lethert at 612-670-9801 or

Shore Power Diagram - opm


Hydraulic Water Jets

Hydraulic water jets, if used properly, are allowed to move water. However, it is illegal if the water jets uproot aquatic plants or move sediment. It is also important that property owners use them so they do not create nuisances for the neighbors. The MN DNR provides information about potential impacts if used improperly.

Public Swimming Beach Closures

Each summer, Hennepin County Public Health samples and analyzes the water at 31 public swimming beaches to help ensure it is safe for swimming. Some of these beaches are located on Lake Minnetonka. The county has the authority to close beaches that are determined to be contaminated and work with the cities regarding public notification. A map that shows the various beaches and status is provided on the Hennepin County website at If a beach is closed, questions may be directed to the listed city.

Lake Minnetonka Conservation District
5341 Maywood Road, Suite 200, Mound, MN 55364
Phone: 952 / 745-0789    Fax: 952 / 745-9085    Email:
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