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Privacy policies of the U.S. Geological Survey.
 Semipermeable Membrane Device (SPMD) and the Polar Organic Chemical Integrative Sampler (POCIS)
Go back to the previous page.

[Map: There is a USGS Water Science Center office in each State.]

Map of U.S. showing water hardness, by watershed.

Privacy policies of the U.S. Geological Survey.

Find Additional Sources of Water-Quality Data

Get Aquatic Bioassessment Data for the Nation

[Map of water hardness across the U.S.]


Map of the U.S. showing water hardness at many domestic wells.
The Institute of Customer Service Member
Contact the USGS Office of Water Quality

Inside of a pipe, showing scale buildup caused by hard water.
A film left on a glass after dishwashing, the result of dissolved calcium and magnesium.
Freedom of Information Act
[Map: Alkalinity of surface waters in the U.S.]
[Chart about water hardness]

Learn more about the USGS Pacific Islands Water Science Center
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