Well, it looks like your water report is incomplete. I don't see sulfate listed, and many of the secondary cations and anions (+ and - ions) aren't listed. Your water company gets its water from both surface and groundwater sources, so it is hard to say as a general rule what could be in it without further info. You could perhaps call and ask for a Water Report for Specialized Water Use Customers (don't know if this is required by EPA regs or not, but my city does it) and they include a more comprehensive listing of concentrations of non-contaminant dissolved solids. Otherwise, if you're so inclined there is a company that many people on these forums have used to get water tests.
A chalky taste might be calcium carbonate precipitated out of your water if it is pretty hard, but this should precipitate when you boil and be swept up in sediment during a racking step. Unless you pour your yeast with your beer, you shouldn't see too much of a problem with calcium carbonate.
I suggest brewing a batch or two with all bottled water, and comparing it to your past results. This should give you an indication of whether or not it is sanitation or your water.
Edit: Both dissolved iron and hydrogen sulfide shouldn't be a problem if you're on a public water system. Both are oxidized by the chlorine used for disinfection.