Low- and moderate-temperature geothermal resources are widely distributed throughout the western and central U.S. There are also a few low-temperature geothermal resources that occur in the east. There has been several major efforts in assessing the potential for low-temperature geothermal resources in the U.S. The first major effort in the 1980s included 17 states which resulted in geothermal resource maps, prepared by the National Geophysical Data Center of the National Oceanic and Atmospheric Administration (NOAA), that are still being used today