I like this topic, Stush you make good points. This house was rural and used to be on well. It is west of Milwaukee. As building escalated in the area, the community water tables began to get low enough (especially for the increases in hydrant needs) that our city decided to partner with the city of Milwaukee to connect to their water supply that is derived from Lake Michigan water. Those of us who had wells were allowed to keep them if they were properly channelled for outdoor use only. I use that all during the warmer seasons but have to turn it off during freezing temps. When it is on, my dawg has several fresh dishes of it and/or rain water at all times. Once there is snow he enjoys eating it and I melt it. In between like this he absolutely boycotts water from the indoor faucet! When I turn on the tap it smells like a swimming pool so I can't blame him. He will drink it once it sits for awhle, I imagine the chemicals settle, so we keep several pans in stages at once. I can see the dawg's reaction quicker than that of the plants but all the same, while I have thought it was simply a seasonal reaction, they likely are feeling the effects of the change in water too.