Yeah, it usually only happens to blonde and light brown hair. My hair used to be lighter when I was younger, and in the summers, I was always outside and so my hair would get bleached from the sun. I used to swim a lot and my hair would get a couple of green streaks through the lightest parts of my hair. Now my hair is dark.
I prefer not to swim in lakes. The ocean is fine. I don't have problems with pools.
The next person used to play in rivers and creeks.