Like Said. Check your water ph after airating for 24 hours. You dont need to do this every time you are watering.
Hard water in the ground dont automatically mean hard water in your tap. Water infrastrukture just hate calcium buildup (and acidic water). That is why Most water plants treat for low hardness and high temporary ph. Make a call to your plant and ask.
The water plant here publishes chemical analysis on a yearly basis. We are in the foothills of the Appalachian mountains, which means there is a lot of limestone in the ground and water percolates through it. The water is pretty hard, which means that fish tanks tend to have calcium buildup around the sides and that indoor plants tend to have calcium buildup since water doesn't pour through the way it does outside. I filled gallon jug with ground water once and let it sit. A week later there was a thin layer of sediment on the bottom.
Tap water here is not as hard as ground water, but it is still hard. PH coming out of the tap is 8.5 to 8.7 and rises slightly over 24 hours to 8.0. I have been through all this water chemistry with the fish tanks. The trees by and large don't seem to be affected by it, maybe partly because it rains pretty often. I started helping the azaleas a little this year and now I get a lot more flowers. Is that caused by the white vinegar? I don't know, but there are a lot more. I was watering them the other day and a hummingbird sat on the hose.