Can someone clarify what seems to be a contradiction between the two recent articles when discussing tips to find safe water. Tips (A) and (2-5) in the following lists don't completely mesh in my mind. Which is safer (all else being the same) cold, fast-moving water or warmer, still lake water? I understand UV helping to kill microbes in a lake, but the idea of multiple water, animal, and insect sources dumping microbes into a warmer lake that could encourage growth doesn't seem like an advantage.
I would choose getting water from the feeder stream rather than the pond/lake.
From "Backcountry Water Quality":
"Currently working with Lake Tahoe expert and UC Davis professor Charles Goldman, Derlet has several other water quality findings in the Sierra that he also hopes to research:
(A) Lakes are typically ‘cleaner’ than creeks, possibly because the ultraviolet rays of sunlight work better at killing off bacteria in calm waters of a lake than in the tumbling flows of a stream.
(B) Algae growth in the backcountry appears to be getting worse.
Bacteria readings appear higher at the beginning of spring runoff rather than later in the summer when water levels are lower and water qualities thought to be poorer.
(C) Valley air pollution could be contributing to water quality problems in the Sierra Nevada."
From "Sipping the Waters":
"Doc’s Rules for Sipping the Waters
(1) Study the watershed you are in. Know what is there.
(2) Look for water near to its source.
Try to take water from the sideslope streamlets.
(3) Avoid water from the main valley stream.
(4) Look for icy cold water.
(5) Look for fast-moving water.
(6) Study the area for the presence of large animals.
(7) Ascertain whether numbers of elk have recently been in the area.
(8) Avoid waters near beaver ponds or cattle grazing.
(9) When possible drink a test amount before drinking liberally a few days later from those same waters."
Also, when I look at all of the marmot *BEEP* piled up on rocks in the Sierra, I have to wonder how much of that gets washed into streams during snow melt and rain runoff.
Are certain animals considered more harmful (marmots, deer, horses, dogs, humans) given equal volume of *BEEP*? Although humans are encouraged/required to bury their scat, the other animals certainly don't.