If you drink untreated mountain stream water you are going to projectile blow out your ass dummy.
That's all you got from my post?
Of course it is.
Science probably makes your head hurt.
Poor stupid rube.
My pinky toe has more science knowledge than you. You outed yourself as an ignorant green snowflake, go ahead drink the mountain stream water when the parasites eat your internal organs you will wish you had listened to me.
Actually, the place where parasites like to live isn't in fresh running stream water, it's in stagnant pools and ponds. And, in Boy Scouts (yes, I was one), we learned that if there is pollution in the water, if you go 100 ft downstream from it, the rocks and plants in the stream will clean it for you. Or, you could just go 20 ft. upstream.
There are LOTS of places in MT and CO that I could show you where the water is perfectly safe to drink.
However...............I refuse to drink pond or lake water without a filter.