I’ve filtered some rather funky water while backpacking. at the same time, a park ranger told me that if I could get about 100 ft. from shore, Lake Superior water is safe to drink. I must say, it was delicious and cold.
I now use mainly the Sawyer Mini filter.
There’s one state park we use that has wells, but the water hasn’t been certified by the state. We use it for cleanup and cooking, but not to drink.
These people who are knowingly drinking unfiltered and untested water are insane.
I found the sawyer Mini to be a great filter.