This paper incorporates some of the research findings related to detection and effect of Geoelectromagnetic Field (GEF) is presented. The effect of GEF on various areas of built environment in general is elaborated and hypothesis of origin of GEF is discussed. It is to be seen that underground water is the main source which produced GEF. Such location is very harmful to human being as well as animals. However in-depth study to detect GEF and to study its effects is necessary