* Updates for this data series are no longer available from the U.S. Geological Survey.
Years Available: 1985, 1990, 1995
Permanent Link: http://data.sagepub.com/sagestats/6430
General Notes: *Median value gives the value for the "average" county for this metric, the 50th percentile of all counties reporting data. **Includes both saline and fresh water.