Geneva Lake Environmental Agency

10/30/2026

Day 5 - We're wrapping up our five-day series by highlighting Aquatic Invasive Species (AIS) and the impact they have on Geneva Lake.

Invasive species like zebra mussels, quagga mussels, and starry stonewort can disrupt the lake's natural ecosystem, affect water quality, and threaten native plants and animals. Once established, they are extremely difficult and costly to manage.

Whether you're boating, fishing, or enjoying other activities on the water, remember to Clean, Drain, and Dry your boats and equipment. These simple steps can make a big difference in protecting Geneva Lake and preventing invasive species from spreading to other lakes.

10/30/2026

5 Days, 5 Ways to Protect Geneva Lake – Day 4

We're a day behind schedule (forgot to post yesterday), but we're back with another important way to protect Geneva Lake!

What happens on land has a direct impact on the health of Geneva Lake. When rainwater flows across lawns, roads, and other surfaces, it can carry soil, sediment, and nutrients into our streams and lake.

10/28/2026

Day 3 of 5 Days, 5 Ways to Protect Geneva Lake!

Today we're talking about road and driveway salt (chloride)!

Salt helps keep our roads and sidewalks safe, but once it enters our waterways, it doesn't simply disappear when winter is over. Over time, chloride builds up and affects the health of our freshwater ecosystems.

Small actions throughout the year add up to a healthier Geneva Lake!

10/27/2026

Protecting Geneva Lake is a community effort, and everyone has a role to play! Throughout this five-day series, GLEA is sharing simple, practical ways residents can help protect our lake's water quality.

There is no single cause or solution to the challenges facing Geneva Lake. However, small actions taken by many people can make a meaningful difference over time.

Today's focus: Leaves and grass clippings! 🍁

Something as simple as keeping leaves and grass clippings out of streets, storm drains, and waterways can help reduce unnecessary nutrients entering the lake.

10/26/2026

Blue-Green Algae Update & Educational Series!

Geneva Lake is looking better today. The visible blue-green algae (cyanobacteria) accumulations we observed last week have significantly diminished in some areas.

However, we're not necessarily in the clear just yet. With warmer temperatures forecasted toward the end of the week, conditions may once again become favorable for cyanobacteria growth and surface accumulations. We could see green streaks and patches reappear along our shorelines, particularly if winds remain light.

🌿 5 Days, 5 Ways to Protect Geneva Lake!
This week, GLEA will be sharing a series of educational posts explaining some of the factors that affect our lake's natural balance, and simple actions we can all take to protect its water quality.

We will also continue monitoring lake conditions and sharing updates as needed.

Remember, conditions can change quickly, and water that looks clear today may look very different tomorrow. SCAN before you SWIM. When in doubt, stay out!

10/25/2026

Our fall edition of Geneva Waters was released last week. There's plenty happening both on and beneath the surface. Catch up on GLEA's latest water quality monitoring, conservation efforts, and important updates about the health of Geneva Lake.

Stay informed, stay involved, and discover how we can all help protect this incredible resource.

🍁 Read the Fall Newsletter: https://www.gleawi.org/geneva-waters-newsletter

10/23/2026

With blue-green algae confirmed at multiple locations around Geneva Lake, GLEA continues to receive questions about whether it's safe to swim.

While not all blue-green algae produce toxins, conditions can change quickly, making it difficult to determine whether an area is safe at any given time.

The best precaution is to assess water conditions before entering and avoid areas with visible green accumulations. Keep pets away from affected water as well.

Please take a moment to review the graphic for more information about current conditions and how to stay safe.

10/22/2026

Blue-Green Algae Update: Geneva Lake

GLEA has confirmed blue-green algae at multiple locations around Geneva Lake, including Lake Geneva Beach. If you see green streaks, surface scum, or floating green material near shorelines or beaches, assume it may be harmful and avoid the water.

Conditions may continue to support blooms over the next week.

SCAN before you SWIM. When in doubt, stay out!

Enjoy the beautiful fall weather and colors, but please stay aware of changing lake conditions!

10/21/2026

We are seeing intermittent blue-green algae blooms in the Williams Bay beach, launch, and surrounding areas of Williams Bay. GLEA is continuing to monitor and test and will keep updating on conditions. As always SCAN before you or pets swim.

10/14/2026

This was observed late yesterday afternoon. It was a small area, and we have confirmed it dissipated with all the rain last night. But if anyone sees anything in the lake that looks unusual, please contact us.

***UPDATE*** Thursday, 10/15/2026 9:00am
The recent rain has helped dissipate the blue-green algae area on Geneva Lake. Report any changes in water condition and learn more about harmful algae bloom by visiting https://dnr.wisconsin.gov/topic/lakes/bluegreenalgae.

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The Wisconsin DNR and Geneva Lake Environmental Agency (GLEA) have confirmed a blue-green algae bloom (cyanobacteria) in portions of the Cedar Point/Williams Bay area of Geneva Lake.

Lake users should avoid water that looks like pea soup or spilled paint or has noticeable discoloration, surface scum, foam, or floating mats. Blooms can move and change quickly with wind and water conditions, so everyone recreating on Geneva Lake should pay attention to the water around them.

Please use extra caution with dogs. Do not allow pets to swim in or drink from water where a suspected bloom is present. Children should also be kept away from affected water.

Recent warm temperatures may have contributed to conditions favorable for the bloom. Cooler temperatures expected this week may help conditions improve, but blooms can persist or move to other areas of the lake.

If you or your pet comes into contact with a suspected bloom:
· Rinse immediately with fresh, clean water.
· Do not allow pets to lick algae or scum from their fur.
· Seek medical or veterinary attention if symptoms develop.
· Call Wisconsin Poison Center: 800-222-1222
· Report illness to WI Department of Health Services by calling 608-266-1120 or completing this online form: https://survey.alchemer.com/s3/3649314/Harmful-Algae-Bloom-HAB-Illness-or-Sighting-Survey

There is no treatment used to eliminate a blue-green algae bloom in the lake. When in doubt, stay out. Continue to watch for changing water conditions even in areas where a bloom has not been reported.

GLEA and the Wisconsin DNR will continue to monitor the situation and share updates as conditions change.