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I know several people who drink the water straight out of the source without problems. They have all had plenty of opportunity to develope immunities over time, but the fact remains they carry no water purification at all.
I was recently on a trip where we tested water quality from the headwaters of the CO river, and followed it down for about 50 miles testing along the way.
At the headwaters, impurities were slight, but coliforms were always present and more often than not they were fecal in nature. Coliforms dont in and of themselvs means "nasties", but they do indicate that the water is a likely host of those nasties.
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