USGS Water-Quality Information
Information on water hardness has been moved to better serve you. Please see the water hardness and alkalinity page.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://water.usgs.gov/owq/Explanation.html
Page Contact Information: USGS Office of Water Quality
Page Last Modified: Friday, 09-Jan-2009 18:57:16 EST
