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Figure 28: Steam Rising from a Geothermal Power Plant Myth #3: Extraction and Injection of Geothermal Water Contaminates Drinking Water Truth: No contamination of groundwater has occurred as a result of geothermal activity. Today every effort is made by the geothermal industry to minimize the effects of geothermal development on local water regime and surface features. Geothermal water is injected back into geothermal reservoirs using wells with thick casing to prevent cross-contamination of the water with groundwater systems. A well casing is composed of thick specialized pipe surrounded by cement in order to prevent any contamination as the geothermal water is put back into the reservoir. Once the water is returned to the geothermal reservoir, it is reheated by the Earthís hot rocks and can be used over and over again to produce electricity. Besides voluntary mitigation efforts on the part of developers, certain geothermal activities, such as injection, are regulated by the EPA to coincide with the Underground Injection Control Program requirements and the BLM and state well construction requirements. These federal regulations were instituted with the specific intent of protecting groundwater resources. In the U.S., according to federal regulations, only the lower-temperature geothermal waters that are of drinking-water quality and that do not disrupt ecosystems might be allowed to flow into streams or lakes. Most geothermal applications, including all higher-temperature geothermal systems, require that the water be injected back into the geothermal reservoir. 48PDF Image | Geothermal 101
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