Is a marshy swampy pond a problem?

Is the water totally stagnant? How does it get filled? What is the water source? Is it full all year?
Fish can eat the algae, But, they need aeration.
A healthy pond will exchange 10% of its water daily. That is a lot. It is not bad if the pond is spring fed but it is impossibly expensive (and almost immoral) if you must use town water.

Treatment is very possible. There is a chemical for everything. Look at this site: The Pond Guy. They are the best! Once they know your location they keep track of the weather and know exactly what your pond needs at any given moment.
(I hate them because they are always right.) :-)

If left swampy and stagnant it could carry mosquitos, snakes and other bugs that could come into your home or keep you from enjoying your outdoor areas.

@chyna I am sure it must have all of those things.

Mosquitoes and Dengue (DENG-gey) fever is a BIG problem !

Check the water temperature. If the temperature is below about 75 F you might be able to put some fish in so they can start working on eating the bugs. If it is in a sunny , hot location you can put in some plants like lily pads to block the sunlight . Ideally you can have 60% plant coverage. That will reduce the sunlight and algae production. It will also give the fish a place to hide from predators.
This can be a fun project for you.

I can’t get near it, there are alligators in this part of the country. I saw a survey showing it as a wetlands area. I might call water management for that part of the state – SWFWMD (we say swiffmud) to ask some questions. Here’s the link https://www.swfwmd.state.fl.us/about

You don;t say if this is a naturally occurring wetland or one that was created in the last 75 years. If it is natural, then it should be left alone.

You try removing one “pest” and you end up killing whatever else is livng off the pond. Egrets, herons, cranes, flamingoes, all love a good marshy pond. So do frogs.

If you’re in Florida, aren’t there all sorts of laws that limit what you can do to natural bodies of water? (like: you can’t dry them, you have to to take environmentally positive steps to do much of anything to it)

I would leave it alone. There was a retention pond behind our condo in Florida. In the dry season it was dry; in the rainy season it filled up. As soon as it filled up, birds appeared. I enjoyed that. Never made me sick.

I agree with @zenvelo.

Could be full of alligators

@omtatsat You say that like it is a bad thing. Up until 1987, alligators were considered endangered. Floridians should not populate alligator habitat.

^But do we really need alligators?

@chyna I’m sure the alligators are asking: Do we really need Floridians?

Now I’ve got the song Amos Moses stuck in my head! Thanks!

Love it!

@LuckyGuy Have some Poke Salad for lunch!

I did mention environmental authorities in my original statement. SWFWMD controls my county. I realize we might not be allowed to do anything.

Yes, it is a problem especially if you get your bulldozer or M1A1 Abrams tank stuck.