You are welcome.
It will not ruin the leather, leather CPR conditioning can restore the bag condition, if you worry about the leather get dried out from being wet then air dried.
Lots of us routinely dunk (wash) our
Coach bags in water, I also dunked some vachetta leather without problems. A method of wet moulding in leather crafting is to completely soak the natural veg tanned leather, then mould to the shape preferred with some reinforcement ( such as clamping), then let it aid dried. Edmonton water probably is just as hard as Calgary. Water itself won’t damage the leather, (it may leave water marks if the leather was not wetted evenly , but you will notice that once dried), during drying process the leather will lose the oil that lubricant the leather fibre, that is why use leather CPR while bag still damp is very important. The more I think about it, the trace amount of iron in city water shouldn’t matter, but maybe some vintage bags collected dust from rusted iron into leather fibre somehow ( such as steel hardware in the house / bag , or old keys ), they then have a chance to react with tannins inside leather while wet. It only happen occasionally, so in order for leather blacken to happen with dunk, all conditions need to be met.
