Aquatic Invasive Species

One of the goals of the Lake Improvement District is to promote the reduction of non-native aquatic invasive species (AIS). Aquatic invasive species are non-native plants, animals and other organisms. When they are introduced into a lake or river they cause harm to the ecosystem. Once in a lake or river they can be impossible to eliminate and difficult to manage.  Each year, thousands of watercraft users come to local lakes and rivers, potentially bringing zebra mussels and other AIS along with them.  

Clean, Drain, Dispose and Dry 

The AIS Fact Sheet helps educate watercraft users on how to Clean, Drain and Dry watercraft and Dispose of bait to prevent the introduction and spread of AIS.  The AIS Fact Sheet also provides information on the types of AIS species currently found in lakes in Chisago County.  Thank you for taking the steps and helping to reduce the spread of AIS.  What you do Matters...and it's Minnesota State law to Clean, Drain, Dispose!

AIS Communication and Education

In 2016, staff developed an AIS Communication and Education Plan for Chisago County with the Mission to "Education Citizens about AIS and encourage behavior that reduces or stops the spread of AIS in Chisago County."  Please view the fact sheet below for more information on AIS educational activities


Watercraft Inspection Program

Chisago County and the Lake Improvement District actively works to minimize the spread of aquatic invasive species by conducting boat inspections at public water accesses. The Watercraft Inspection Program goal is to inform and educate watercraft users on the threats of AIS.  Inspections are key to helping watercraft users understand how to prevent the spread of AIS by cleaning off weeds, dumping and replacing minnow bucket water, and removing the drain plug to let water drain from watercraft.


AIS in Minnesota

  • 95% of lakes in Minnesota are not infested with AIS.
  • 98% of lakes in Minnesota are not infested with zebra mussels.

Let's continue to work together to help prevent the introduction and reduce the spread of AIS in the Lake Improvement District.  Visit the MN Department of Natural Resources (DNR) Infested Waters List for known locations of invasive species found in Minnesota lakes and rivers.

AIS Treatment Program

The Lake Improvement District also provides cost share funds to lake associations for treatment of Eurasian Watermilfoil and Curly-leaf Pondweed to improve navigation for watercraft in area lakes.

Aquatic Plant Surveys

Common Carp Surveys

Aquatic Invasive Species and Watercraft Inspection Reports

Zebra Mussel Plan