Geneva Lake Environmental Agency
Our 2025 E. coli testing season has wrapped up for the year, but the Geneva Lake Environmental Agency remains active year-round to protect and study Geneva Lake. Even outside of the summer monitoring season, our staff and partners are hard at work on projects that safeguard water quality, fisheries, and habitat.
Here’s what we’re focused on:
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Algae and water-quality monitoring – expanding use of new sensor technology to detect changes quickly.
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Fishery and habitat projects – supporting cisco survey work and preparing additional fish cribs for installation.
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Invasive species management – monitoring for Starry Stonewort, zebra mussels, and other aquatic invasives.
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Watershed research – tracking nutrient and E. coli sources in tributary streams.
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Education and outreach – working with schools, lakefront associations, and community groups to promote best practices for protecting Geneva Lake.
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Collaboration and planning – coordinating with municipalities, the DNR, and USGS on long-term strategies like lake level monitoring, shoreline protection, and the Geneva Lake Management Plan.
Thank you for supporting our mission. While swimming season may be over, our commitment to Geneva Lake never takes a break.
2025 SUMMER PUBLIC BEACH TESTING
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GLEA provides weekly E. coli testing as a public service but cannot guarantee real-time water safety. These results are a snapshot of water quality, as bacteria levels can shift quickly. It is important to remember the decision on whether to swim is at your own discretion. Use caution, especially with young children or individuals with weakened immune systems.
The Geneva Lake Environmental Agency is determined to maintain the environment and resources of Geneva Lake by protecting, preserving, and enhancing lake and watershed quality through monitoring, data collection, and education.
WE MOVED!!
Our new address is:
105 N Elkhorn Rd. Williams Bay, WI 53191
Our new office is conveniently situated right next to Dip in the Bay in Williams Bay. We are eager to make use of our upgraded educational spaces. Feel free to drop by as we are still settling into our new office.
We appreciate your patience during this transition. Thank you!
Check out new boat cleaning stations at Williams Bay, Lake Geneva, and Fontana launches!
Brought to you by the Geneva Lake Environmental Agency, Villages of Williams Bay and Fontana, the City of Lake Geneva, and WI DNR grant.
CD3 Roadside
Waterless Cleaning System
We encourage you to clean your boat when entering and exiting Geneva Lake to help us stop the spread of aquatic invasive species
A CLEAN BOAT MEANS CLEAN WATERS
Thank you to Ms. Garcia & Katrina, Elizabeth, Julia, and Chris for finding this excellent resource and sharing the importance of lake ecology!
SWIMMERS ITCH
How to stay safe this summer
Swimmer's itch is caused by flatworm larvae that can unintentionally latch onto human skin when looking for a waterfowl host and cause irritation or itchiness. They like warm water at around 72°F. When your skin dries, the larvae will burrow into the skin and eventually die, but this typically results in some uncomfortable itchiness.
WAYS TO TREAT
Don't scratch! Use an antihistamine lotion. Swimmer's itch is rarely serious and will pass in a couple days.
CONTACT US
Tel. 262-245-4532
PO Box 914
105 N Elkhorn Rd.
Williams Bay, WI 53191
Our Office:
Located in the same building as Dip in the Bay, Ice Cream Shop.
105 N Elkhorn Rd., Williams Bay, WI 53191
Hours: Monday - Friday: 8:30 AM - 5 PM