The study was undertaken to investigate the treatment of raw sewage with lime as a form of primary treatment. An evaluation of this process, which was in common use a few decades ago, as a means of removing phosphorus was made. Removal of nitrogen, BOD, and coliform bacteria were also measured as well as the character and volume of sludge produced. A less extensive investigation was also made of two forms of secondary treatment for cases where primary treatment alone would be inadequate.