New energy technologies, along with the benefits, are associated with challenges and Difficulties. Geothermal energy as one of the renewable energies is a clean and sustainable energy source, yet its development still has some impact on the environment such as: greenhouse gas emissions, noise pollution, surface and groundwater contamination, subsidence, and seismicity. This paper provides a brief description of some effects of geothermal development on the air, water and soil. Although, the use of this energy leads to the prevention of acid rain problems and dramatically reduces greenhouse gas emissions and atmospheric pollution, in geothermal brine, drilling operations, Installation and Laying of pipelines, contain materials which have the potential to damage the environment. In the following some of the measures to monitor and reduce environmental impacts in different regions  are described. In addition to discussing the risks associated with the geothermal development, the paper describes some of the environmental monitoring and mitigation measures that have been maintained by European  regulation.