Originally Posted by 2-turn
Paul, I can trump this. I saw a guy at Hermit Lake on Mount Washington, dip his camelback into the stream to fill it up. He was about 200 feet downstream of the outhouses
We always used a water purifier when up there, and pump upstream of the camping area. They've since put in a well and pump.
Granted this is third world country stuff, but the "best" one I saw of a similiar situation was a few years back I was a team leader that took a group of dental students down to the Amazon River basin in Peru to do work on some of the native amazonians. Basically, you'd get in a boat at the base camp, take the boat up river for anywhere between 1 to 5 hours, take out any tooth on the local villagers that needed to be done, then get back in your boat and head back to base camp each day.
One day, we're getting in our boat to head back to base camp and a number of kids from the village we were in came down to the riverbank to watch us leave. Granted, the Amazon isn't exactly full of crystal clear water, and where we were and the fact that it was rainy season, the water in the river was closer to mud than regular water. On of the little boys was then peeing in the river all of about 2 feet upstream from where another boy was cupping his hands in the river to get some of that muddy, murky water to drink
Have faith in your immune system!