Some are but not all. Those higher in the mountains are crystal clear, as to the bigger ones where lots of people go or rivers enter them, they are less clean, you can still swim in them, but can't drink the water :)
Some are but not all. Those higher in the mountains are crystal clear, as to the bigger ones where lots of people go or rivers enter them, they are less clean, you can still swim in them, but can't drink the water :)
RE: Time to cool off at the local lake in the summer