Do you need a DNR permit to remove lake weeds?
Often, no. Under Wis. Admin. Code ch. NR 109, a shoreline owner can manually remove aquatic plants (hand-pulling, a string trimmer, or a push mower on exposed lakebed) in a single area up to 30 feet wide measured along the shore, as long as your pier, lift, and swim raft sit inside that zone. You can also remove the invasive plants Eurasian watermilfoil, curly-leaf pondweed, and purple loosestrife by hand along your frontage without a permit.
You do need a permit for larger manual or mechanical removal, for any chemical (herbicide) treatment, for bottom barriers, and in sensitive areas or where protected species grow. Read the full breakdown in our permit guide.
Native plants vs invasive plants: why it matters
Most of the green in a Wisconsin lake is native and does real work: it feeds fish, holds the bottom in place, and keeps algae down. Native plants get more protection under the rules, which is why the no-permit zone for them is capped at 30 feet. Invasive plants like Eurasian watermilfoil and curly-leaf pondweed are a different story. The state wants them gone, so you're allowed to hand-remove them more freely. Knowing which one you're looking at changes what you're allowed to do.
Frequently asked questions
Who runs this site?
Lake Weed Wisconsin is a publication of Tanner Preserve, a Delafield, Wisconsin company. We built it to help lakefront owners around Lake Country and the rest of the state understand their choices and the rules before they spend a dollar. Learn more about us or send a question. For an actual permit, you work with the Wisconsin DNR, not us.