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Bookmark or Share- Hardness of Water | U.S. Geological Survey - USGS.govA study from the National Water-Quality Assessment (NAWQA) Project assessed water-quality conditions for about 2,100 domestic wells across the United States. Water hardness was one water-quality parameter studied; results are shown in the map below.
- USGS.gov | Science for a changing worldTracking down commodity sources: The surprising role geoscience can play in assisting U.S. foreign policy
- Who We Are | U.S. Geological Survey - USGS.govThe U.S. Geological Survey works with many partners to provide objective and impartial science to resource managers, emergency response, and the public.
- The National Map Viewer | U.S. Geological Survey - USGS.govThe National Map is a collection of free, nationally-consistent geographic datasets that describe the landscape of the United States and its territories.
- About Us | U.S. Geological Survey - USGS.govAbout Us We provide science about the natural hazards that threaten lives and livelihoods, the water, energy, minerals, and other natural resources we rely on, the health of our ecosystems and environment, and the impacts of climate and land-use change.
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