The DNR permit rules for removing lake weeds in Wisconsin come down to one question: how much are you removing, and how. Do a little by hand along your own shoreline and you need no permit at all. Go bigger, or reach for herbicide, and the Wisconsin Department of Natural Resources has to sign off first. This guide walks the line so you know which side you’re on before you start pulling.
Which rule covers your project: NR 107 or NR 109?
Two chapters of the Wisconsin Administrative Code run aquatic plant management:
- NR 107 covers chemical and biological control, meaning herbicides and things like grass carp. A permit is always required to put herbicide in a water of the state.
- NR 109 covers manual and mechanical removal, meaning hand-pulling, raking, cutting, harvesting, and bottom barriers. Permits here depend on how much you remove and where.
If you plan to do both chemical and mechanical work, you need a permit for each. Chemical permits under NR 107 are issued for the season and expire, so they’re not a one-time thing.
When do you NOT need a permit?
Wisconsin gives shoreline owners a few clear exemptions under NR 109.06.
The 30-foot manual removal corridor. Under Wis. Admin. Code NR 109.06(2)(a)1., you can manually remove native aquatic plants in a single area no wider than 30 feet measured along your shoreline, with no permit, as long as your pier, boatlift, swim raft, and other water-use devices sit inside that same 30-foot zone. Allowed methods are hand-pulling, a string trimmer (weed whacker), or a push mower on exposed lakebed. You have to remove the cut plants and dispose of them up on land.
Removing invasive plants. You can hand-remove the invasives Eurasian watermilfoil, curly-leaf pondweed, and purple loosestrife along your shoreline without a permit. Because the state wants these gone, you’re not held to the 30-foot cap the way you are with native plants.
Small private waterbodies. Under NR 109.06(1), manual or mechanical removal is exempt on a waterbody 10 acres or smaller that’s entirely confined on one person’s property, with that owner’s permission. Note that chemical rules can still apply to a private pond.
When DO you need a permit?
You need DNR approval before you:
- Remove native plants manually from an area wider than 30 feet along your shore.
- Use any mechanical harvester or cutter beyond the small-waterbody exemption.
- Apply any herbicide or algaecide in a water of the state (NR 107).
- Install a bottom barrier or benthic mat (this is regulated, often under ch. 30 as well).
- Do any removal in a designated sensitive area, or where wild rice or a state or federally listed species is present. In those spots even the 30-foot exemption doesn’t apply.
When in doubt, call your regional APM coordinator before you touch anything. A five-minute call is cheaper than an enforcement action.
How do you apply for a permit?
Applications go through the DNR’s online ePermitting system, which needs a MyWisconsin ID login. You describe the area, the plants, and the method. The DNR reviews it, and for many projects the plants have to be surveyed and mapped first, which is why lake-wide chemical projects usually run through a lake district or a hired applicator.
Per the DNR’s published guidance, decisions are typically issued within 10 to 15 business days of a complete and acceptable application, and applications show up in the public search a few business days after they’re submitted. That public-notice step is normal and lets neighbors weigh in.
What does a permit cost, and how long does it last?
Fee amounts change, so check the current DNR fee schedule rather than trusting a number you read online. Two things worth knowing: NR 109 (manual and mechanical) permit fees are non-refundable, and NR 107 chemical permits are seasonal, so a whole-lake herbicide program is an annual expense, not a one-and-done.
Who do you contact?
Start with the DNR Aquatic Plant Management program by email at DNRAPMProgram@wisconsin.gov, and find your county’s regional APM coordinator through the DNR forms page. They handle the sensitive-area question and can tell you what your specific lake allows.
Frequently asked questions
Can I clear weeds in front of my pier without a permit?
Yes, within the 30-foot corridor under NR 109.06(2)(a)1., by hand-pulling, string trimmer, or push mower, with your pier and swim area inside that zone and no protected species present.
Do I need a permit to pull Eurasian watermilfoil?
No permit is needed to hand-remove the invasives Eurasian watermilfoil, curly-leaf pondweed, or purple loosestrife along your shoreline. A chemical treatment for them still needs an NR 107 permit.
Is a bottom barrier exempt like hand-pulling?
No. Bottom barriers and benthic mats are a regulated physical method and generally need DNR approval before you install one.
How long does approval take?
Usually 10 to 15 business days for a complete application, per DNR guidance, though survey requirements can add time.
My lake is bigger than 10 acres. Does the small-waterbody exemption help me?
No. That exemption only covers a waterbody 10 acres or smaller entirely on one person’s land. A public lake doesn’t qualify, so you’re back to the 30-foot corridor for manual work.