The material presented herein constitutes the Final Report prepared by the City of San Bernardino and its two subcontractors Science Applications, Inc. and Coulter Stewart & Associates, Inc. on the Department of Energy's Grant DE-FG03-80SF1l442 entitled, "Feasibility Study for Wastewater Treatment Utilizing Geothermal Energy in San Bernardino." The study team has developed a system for utilizing nearby low temperature geothermal energy to heat two high-rate primary anaerobic digesters at the San Bernardino Wastewater Treatment Plant. The geothermal fluid would replace the methane currently burned to fuel the digesters. A summary of the work accomplished on the feasibility study is presented in Chapter 2, “Summary and Conclusions"