That doesn't surprise me at all, but I am glad to hear it, thrilled in fact.

This qualifies exactly what the cattle ranchers that introduced me to the backcountry in the Sierras taught me 40 years ago: "Alway look upstream to see if anything nasty is there. Don't drink from still ponds or pools of water, drink from running streams where the water is moving. If you do have to drink from a pool in a stream brush the top of the water first and then drink. Boil pond and lake water before you drink it"

I doubt much has changed in the numbers of cattle grazing on that land over the years. Those ranchers knew what they could put on that land and they were excellent stewards. They loved that land as much as anyone could and were experienced and proficient complainers when someone disturbed it.

At least I sure hope that hasn't changed...