Can an outdoor swimming pool get infested with worms?

Yes, and some worms thrive in the pool. But most are not the type of worms to infest humans; the horsehair worm infests crickets and other bugs, but not people.

Crytosporidium, a parasite, is a bigger concern. Don’t swallow pool water.

Are we talking about a pool that is frequently used and kept clean and chlorinated? Because if that is the case, I would doubt the worm thing.

@anniereborn Yes it is a group condo owned swimming pool.

Since it’s been awhile since you were a child, maybe they didn’t use the chlorine as well as they should have at that time

Not a well maintained swimming pool.