Well, I love swimming in my pond. It's a great way to cool off on a hot day.
I've always got a bit of algae growing. We didn't get much rain from Jan to May, so no new water coming in. Had a foot or so of runoff lately.
I hope I don't get sick, but I do have four grandkids that like swimming also.
I'm not going to test it every time we swim, and nose plugs are a pain in the backside.
Guess I'm rolling the dice, but I better make my kids aware of the risks, and maybe the grandkids need to stay out of the water.
This isn't making me too happy..

12 yr old pond, 1 ac, 15' deep.
RES, YP, GS, FHM (no longer), HBG (decreasing), SMB, and HSB (only two have been seen in 5 yrs)
I think that's about all I should put in my little pond.
Otter attack in 2023.