At my farm, I was blessed with excellent water and a great well. I'd give anything for it to have it now! Naturally, it was rock steady stable! With my new place I am on co-op water and I am less the quarter mile away from the well and the tank. It's extremely consistent Luckily there's no chloramine, but there is a hellacious amount of chlorine!
Naturally, I let it sit to off gas the chlorine. I usually have 15 gallons, three buckets, in various stages of off gassing and I usually have five gallons bubbling in the grow room.
Now in the city, there are quite a few of them that have multiple sources during different times of the year. Most of the DFW Metro area is like that. Water can very greatly there !