In high altitudes during spring melt or after a big rain there is a higher chance that the water MIGHT be safer. But as a general rule open ground water should be purified if possible.
Published on Apr 14, 2013
This video talks about spring water and the fact that it is generally safe to drink without purification or filtration if it is coming up from the ground and running off into another area and not sitting still allowing other contaminates to gather in it. If you have the means to filter and purify you should always do so. But if you don’t this is one source that you can generally bet is safe to drink.