who would I contact for a copy of that, my local water utility provider?
Yes. You can visit this site for more info and links to water providers published CCR reports
http://www.epa.gov/safewater/ccr/
keep in mind that they're not all published online. My city/county wasn't on the list so I did a google search, found my local provider and called them up to make sure it's them. I asked for a copy of the CCR and at first the woman had no clue what I was talking about. She put me on hold and when she got back on she knew exactly what I was looking for and asked if I'd like it mailed, faxed, or emailed to me
I'm growing in soil myself so If I can get decent water for the plants, I don't sweat it much. I know hydro is more picky but it doesn't hurt to see what you're starting with. According to the report I got there are only about 65ppm of tested "contaminates" in my water, of which sulfate and sodium account for about 2/3 of that number. The list includes Nitrogen, Sulfate, Atrazine, Chloroform, Bromodichloromethane, Copper, Lead, Uranium, Radium, Alpha emitters, Total organic carbon (raw and treated), Total Trihalomethanes, Total Haloacetic Acids, Chloramines, chlorine, manganese, iron, and sodium.
To put it in perspective one thing we hear about a lot is chlorine or chloramine, and the combined total tested in my water is 4.6ppm. I don't expect those levels would harm the plants in any significant way.