City Cast Madison logo
Advertisement image

Is It Safe To Swim?

Posted on June 26, 2024   |   Updated on September 30, 2025
Ava Wojnowski

Ava Wojnowski

The sunsets over Lake Mendota's shore.

There are many docks on the lakes of Madison for folks to use to swim. This is a dock on Lake Mendota. (Ava Wojnowski / City Cast Madison)

If you're like me, you’ll do anything to get into a body of water during the summer months. Madison is a great place to go swimming with the many lakes the city has to offer. But there are a few things to keep in mind before diving in.

🏊Before You Swim

The City of Madison constantly checks the safety of the water in our lakes. For updated information on each beach, you can check with Public Health Madison & Dane County to see what beaches and lakes are open for swimming. While the city tries to be as accurate as possible, conditions can change quickly. This means you should still keep an eye out for green-blue algae.

⚠️What Exactly is Blue-Green Algae?

Now, you may wonder what exactly you’re looking for when it comes to blue-green algae. The city describes it as “algae that looks blue-green, green, reddish-purple, or brown, murky looking water that has a texture similar to ‘pea soup,’ a layer of scum or puffy blobs floating on the surface, and a strong musty odor near the water.”

Coming into contact with blue-green algae can cause skin irritation, nausea, respiratory problems and more. The importance of being smart is key when it comes to swimming in these lakes!

If you do come into contact with the blue-green algae, make sure to wash off immediately.

🐶Note for Dog Owners

Dogs are more affected by the blue-green algae because they're smaller than humans. Make sure to keep an eye on where your dog swims and if they ingest any water. Also, make sure to wash off your dog after they swim in a body of water that may have the blue-green algae.

Ready for a swim?

Share article

Hey Madison

Sign up for your free daily toolkit to get the most of the city you love.

Can't subscribe? Turn off your ad blocker and try again.
Advertisement image

Urban Almanac

See All
Urban AlmanacJune 11, 2025

When Is It Safe to Swim in Madison’s Lakes?

Summer is here and it's time to take a swim! But there are a few things to keep in mind before diving into one of Madison's lakes.

Two people swimming in a lake during sunrise.
Urban AlmanacMay 28, 2025

How To Keep Madison’s Wild Baby Bunnies Safe

The Dane County Humane Society’s Wildlife Center is receiving a lot of calls about Eastern Cottontail rabbits as people are finding more...

Gray Eastern Cottontail bunnies in a nest.
Urban AlmanacMarch 31, 2025

How To Take Care of Indoor Plants This Spring

Are you wondering how to take care of your indoor plants this Spring? Or thinking of getting some new ones? We dive into plant ideas and...

Collection of monstera and other indoor plants under a warm lamp taken from above
Urban AlmanacOctober 9, 2024

How a New Tool Helps Reunite Pets With Their Owners

A new Madison Police Department microchip scanner will help pet owners reunite with their lost dogs and cats.

Two women hold a bulldog and an electronic device.
Urban AlmanacOctober 2, 2024

Take a Break From the Rake!

Fall is here! Soon, you’ll be serenaded by the sound of your neighbor’s leaf blower, and wonder if it’s time to get out your own, or a ra...

The feet of a woman in a blue coat kick leaves in the forest.
Urban AlmanacSeptember 25, 2024

Why the Cows Come Home To the World Dairy Expo

The cows come home to Madison next week as the World Dairy Expo returns to the Alliant Energy Center Oct. 1 to Oct. 4. You might have hea...

A group of cows line up in a stadium on a green floor.
Urban AlmanacSeptember 18, 2024

Hang Out At Madison’s New Lakefront Porch Park

A lot of people passed by the Madison Water Utility reservoir at 201 S. Hancock St. and just saw concrete. But others saw an opportunity...

Tables and chairs sit on a wooden outdoor platform.
Urban AlmanacSeptember 11, 2024

A Sheep Way To Help Solar Projects

It’s a farm friendship as unlikely and fruitful as Charlotte the spider and Wilbur the pig – sheep and solar panels. Solar array projects...

Sheep graze in a field next to solar panels.

The latest in Madison

Madison's BestApril 21

Your Guide to the Barrymore Theatre’s Fit Film Fests

In addition to being a favorite spot for live music and comedy, the Barrymore Theatre on Madison's east side hosts one-night-only film fe...

The interior of a theater full of people.
Food & DrinkApril 16

Madison’s Favorite Neighborhood Bars

Madison has its share of high-end cocktail bars, but there's nothing like a neighborhood bar where it feels like everybody knows your nam...

The exterior of a bar with brick and red wood.
Madison HistoryApril 15

The History of Madison in 10 Isthmus Headlines

Madison alt-weekly Isthmus is celebrating its 50th anniversary this month. The editors dug through the archives to look to see how the ne...

A black-and-white photo of two men surrounded by newspapers.
Madison's BestApril 13

How to Celebrate Earth Day 2026 in Madison

Earth Day is personal for Wisconsin, because it was U.S. Sen. Gaylord Nelson who made it a national day to celebrate and promote environm...

A man in a plaid shirt peruses a rack of clothes.
Food & DrinkApril 9

Where To Find the Best Bagels in Madison

Madison has plenty of great bagel options, from Mermaid Kitchen to Gotham Bagels to Bagels Forever.

Metal racks of bagels on a counter.
Madison, ExplainedApril 7

Reader Tips On How To Beat High Gas Prices

According to AAA, the average price of a regular gallon of gas in Dane County is $3.87 a gallon.

A gas station sign next to a busy road.
Madison's BestApril 6

After ‘John Wick,’ Madison-Born Writer Wants Something ‘Normal’

Derek Kolstad may be best known for writing the first three "John Wick" movies. His latest action film, "Normal" starring Bob Odenkirk an...

A sheriff holding a gun is flanked by two other people.
Food & DrinkApril 2

Where to Go For Easter Brunch in Madison

Don't have plans for the family on Easter morning? Don't worry. Most spots in Madison have openings still for their brunch events, includ...

A place setting with pink plates and pink bunny statues.