The best way to tell for sure is to have a plumber provide a quick inspection. Other ways to identify your water line materials:
The City has launched an interactive GIS map that allows residents to search properties by address or parcel number to gain information about the material(s) of the home's pipe connection.
If your results are not available using the map, or if you want to verify your materials, the City has launched an online form to help you do so.
