Looking good is a subjective term when it comes to ponds. What you consider weeds may be part of a normal pond environment. Native aquatic plants (such as Duckweed, Water Lilies and Coontail) are good for pond health and provide food and shelter for aquatic wildlife. However, algae blooms can be a problem caused by too many nutrients in the pond. Invasive plants such as Eurasian Watermilfoil and Curlyleaf Pondweed can also overtake a pond. If you want to control algae or aquatic plants in your pond, you will first need to determine if the MN DNR considers your pond a “Public Water.” Aquatic plants growing in public waters are owned by the state and a permit may be required to control the plants. Generally, city ponds over 2.5 acres or more in size are considered public waters, but you should contact the MN DNR to check on your pond’s status. Learn more about the MN DNR Aquatic Plant Management Program through the link below. Learn more about the MN DNR Public Waters Inventory: http://www.dnr.state.mn.us/waters/watermgmt_section/pwi/maps.html Whether or not you need a permit, you should talk with neighbors that share the pond before proceeding with any pond treatments. The City also classifies some ponds as wetlands, which have ordinances in place to protect them. To find out if your pond is a wetland, visit the Lakes and Ponds section of our website or call 952-895-4550.
DNR Aquatic Management Program...