The intent of the Westchester County Infiltration/Inflow Rehabilitation Program, part of a Consent Order Agreement between the New York State Department of Environmental Conservation (NYSDEC) and Westchester County, was to reduce the amounts of I/I getting into the sanitary sewers leading to four Westchester County Wastewater Treatment Plants. The Program encompassed pre-design field investigations of sewers and manholes, the design of rehabilitation projects, and construction administration services. Savin Engineers provided design and construction administration services during the two-year program: preparing design specifications and drawings for the lining of 350,000 linear feet of sewer, 8" to 48 inches in diameter; waterproofing, and the reconstruction of 2,600 manholes; point repairs at 12 locations, and ancillary repairs to streets, curbs, sidewalks, and adjacent utilities, and coordinating the ancillary repairs with 30 different communities. Cured-in-place-pipe and fold-and-form liners were specified for the sewer lining, depending on the size of pipe. Cementitious and epoxy waterproofing were specified for the rehabilitation of leaking manholes. After the rehabilitation was completed, services provided by Savin included an evaluation to determine the effectiveness of the program. It was determined that infiltration was reduced by an average of twenty-nine percent and inflow was reduced by an average of twenty percent at the four wastewater treatment plants.