Is my tap water ok?

[SueinNC]

I am wondering about my tap water.
The town water plant keeps Hardness (mg/L CaCO3), between 15 and 16. The Alkalinity (mg/L CaCO3) is 20. The pH is 6.5, which I am figuring is ok since it is almost neutral. How does hardness and alkalinity affect how I care for plants. Do I have to adjust fertilizer or anything?

[Ray]

Your hardness and alkalinity are quite low, which can be great, and the pH is fine.

Personally, I'd use a fertilizer made for pure water with that, as the Ca and Mg might be a bit lacking.