In Portland USA, an eight million gallon water reservoir was drained after a young man was seen urinating in it. Given that the water official interviewed freely admits that they don’t empty the reservoir when dead animals are found in it these seem like a bit of an over-reaction. His explanation for draining the reservoir was because of the yuck factor.
Quite frankly, for me the “Yuck” factor from a dead animal is far stronger than the idea of of small amount of urine being present. Urine is generally considered to be relatively sterile, made up largely of water and containing mainly urea and dissolved salts.
Of course, if they could have worked out some way to shake the reservoir they could have had 8 million gallons of homeopathic solution – though it would require further dilution before it was “strong” enough to use.