Delavan Lake Improvement Association
News, Alerts &
Lake Reads
The Delavan Lake watershed is the 26,000 acres of land that surrounds and drains into Delavan Lake. Nitrates and agricultural fertilizers that contain phosphorus are two nutrients when in excess amounts pollute lakes, streams, and wetlands. They are carried in sediment from farm field soil runoff in melted snow and rain into our watershed which drains into our lake. The Delavan Lake's watershed determines the amount of nitrates and phosphates that enter the lake via surface water runoff.
The DLIA is actively working to protect the lake through the Delavan Lake watershed.

  • fuels excessive algae growth and blooms
  • growth blocks other aquatic organisms from sunlight
  • water oxygen decreases from decomposing algae
  • organisms and fish die because they can't breathe
  • water turns green or white and gives off a strong rotten egg odor
  • increase in rough fish (carp, bullheads)
Nutrient runoff impact on Delavan Lake water quality:
The Delavan Lake Improvement Association is committed to providing financial support to farm conservation programs in the Delavan Lake watershed to help prevent detrimental nutrient loaded soil sediment from entering into our lake. 

In Managing the Water's Edge* case study on page 17, "...riparian buffers are capable of reducing large percentages of the phosphorous and sediment that are currently being carried by Wisconsin streams. Even in watersheds with extremely high loads (top 10%), an average of about 70% of the sediment and phosphorus can be reduced through buffer implementation." 

Local farmers in our Delavan Lake watershed are invited to participate in conservation practices designed to plant buffer strips (cover crops) in key areas to slow down runoff into the watershed from their farm fields during storms and snow melts. The role of The Delavan Lake Improvement Association is to pay the land operator (farmer) for lost profits from taking the land out of production. This is typically done on a per acre basis renewed annually. 

*This brochure was prepared by the Southeastern Wesconsin Regional Planning Commission to educate citizens about managing lakes and buffer zones.
The DLIA partners in the Healthy Lakes Initiative Program.

The Delavan Lake Improvement Association and Delavan Lake Sanitary District Partner in Healthy Lakes Initiative Program. Healthy Lakes Initiative is a statewide Department of Natural Resources program that offers grants of up to $1000 for best management practices installed by homeowners on their lakefront property. There are the five best management practices that homeowners can install with grant funding. Learn more...
Delavan Lake Improvement Association - Copyright 2019
Delavan Lake Watershed

Our Mission: The Delavan lake Improvement Association advocates for policies and practices that support healthy lake water quality. We support land uses and farming practices designed to slow sediment entering the lake from the watershed. As advocates, we keep our members informed of current issues affecting the lake by maintaining constructive relationships with other lake monitoring partners. These partners include Town of Delavan, WDNR, Walworth County Conservation, USGS & the Delavan Lake Sanitary District. 
Farmers Improving
 Soil Health & Water
Producer-Led Watershed 
Protection Grants
Shoreline Stabilization Guide 
for Homeowners
Mound Road Basins
 Dredging Project Update from the Town of Delavan
Lakeshore Properties Resource Guide for
Walworth County
DLIA Spring 2022 Newsletter 
Be sure to read. Provides important lake information.