Do I need to watch neighborhood kids at the pool?

I have one child and our condo building has a shared pool. When we go swimming other kids flock to the pool which is not a problem at all. The problem is, when we get out, I’m ready to go...but I feel like I have assumed responsibility at that point and can’t leave kids swimming alone. Their parents are at work or don’t even live here bc the kids invite their friends from the neighborhood. Or the parent will tell me their kids are fine to swim unsupervised and have permission to swim alone. Well I can tell you based on the behaviors I see, they are not fine to swim alone. Some of the kids tell me they have permission to swim as long as an adult is watching. Well I’m here, but I didn’t sign up for being a lifeguard all summer.I feel like the parents who work think I’m literally sitting here all day happy to watch kids swim, since mine swims too, but we swim for maybe 30 minutes not all day, and we have other things to go do. I’m sure if I tell the parents they would say I’m not obligated to watch them but honestly I can’t relax knowing these kids are in the pool alone. Today I had to stop one from dragging the other to the bottom of the pool when he was already out of air. The kid came up choking and crying. If I had not stopped the kid who knows how much longer he would have held the other under.What should I do? I don’t want to be held captive at the pool all summer. If it matters, the ages are 9-13. via /r/Parenting http://bit.ly/2WkfGn8