Will you get ill from the water? (As you mentioned.)
Is it separated from watercraft traffic? (I've been to swimming areas with buoys to mark off where motorboats are not allowed.)
Is there enough safety infrastructure? (For faster rivers, people can get pulled downstream too far. Is there a rope at the end of the bathing area to help people catch themselves? If the river has steep banks or walls, are there ladders for people to get out? Are there life rings and poles so people on shore can help those who get into trouble?) While this could lead to drowning, other possibilities can include hypothermia, or if someone managed to get onto small island but is exhausted and can't get off.
Are there appropriate cautions posted or even closures for things like (this shows my beach background) unusually strong rip tides or jellyfish swarms?
Is the area physically appropriate for swimmers? (I'm old enough to live through the pull-tab era, where people would toss the sharp-edged tabs into the sand, then someone else would step on it and cut their foot, eg, https://pulltabarchaeology.com/archaeology/ . Or read about the "syringe tide" at https://en.wikipedia.org/wiki/Syringe_tide .)
Why do you guess that? The sentence includes both "safe" and "healthy"; the latter is redundant on your guess about the former. This is basic reading comprehension really.
A lake can be unsafe for people to swim in yet have a healthy ecosystem and vice versa. Or, if your reading is correct, redundancy might be an aesthetic choice.
Interpreting "healthy" as "healthy ecosystem" doesn't really make sense in the context of an initiative focused on people being able to swim.
This thread gives me the vibes of arguing for the sake of arguing. The first point mentions "safe" and "healthy", of course this initiative cares about both good water quality and safety from drowning, because those are quite important things for people wanting to swim.
I was very obviously only making a joke. But ironically your reply perfectly embodies the petty, joyless and argumentative side of HN commenting I was alluding to.
Will you get ill from the water? (As you mentioned.)
Is it separated from watercraft traffic? (I've been to swimming areas with buoys to mark off where motorboats are not allowed.)
Is there enough safety infrastructure? (For faster rivers, people can get pulled downstream too far. Is there a rope at the end of the bathing area to help people catch themselves? If the river has steep banks or walls, are there ladders for people to get out? Are there life rings and poles so people on shore can help those who get into trouble?) While this could lead to drowning, other possibilities can include hypothermia, or if someone managed to get onto small island but is exhausted and can't get off.
Are there appropriate cautions posted or even closures for things like (this shows my beach background) unusually strong rip tides or jellyfish swarms?
Is the area physically appropriate for swimmers? (I'm old enough to live through the pull-tab era, where people would toss the sharp-edged tabs into the sand, then someone else would step on it and cut their foot, eg, https://pulltabarchaeology.com/archaeology/ . Or read about the "syringe tide" at https://en.wikipedia.org/wiki/Syringe_tide .)