The U.S. Navy will host an open house next week to connect with area residents and request permission to sample private drinking water of those who live around the Mechanicsburg base. The Navy wants to test private wells for per- and polyfluoroalkyl substances, or PFAS, within its sampling area near Naval Support Activity Mechanicsburg. The Navy is not interested in testing water of those served by Pennsylvania American Water or Veolia Water Pennsylvania. The open house will be from 6 to 8 p.m.