The Types of Classifications for Service Lines are Defined as One of the Following:

Lead: A portion of the pipe is made of lead, which connects the water main to the building inlet.

Galvanized Requiring Replacement (GRR): A galvanized service line that is or ever was downstream of an LSL or is currently downstream of an unknown service line.

Non-Lead: The service line is determined not to be lead or GRR through an evidence-based record, method, or technique.

Unknown: The service line material is not known to be a lead, GRR, or non-lead, such as where there is no documented evidence supporting material classification. EPA recommends you track additional information in your inventory, such as pipe diameter and installation date, source of material information, actual material of nonlead lines, and other lead sources (e.g., lead goosenecks and solder).

Photo Source: EPA