* Updates for this data series are no longer available from the U.S. Geological Survey.
Years Available: 1985, 1990
Permanent Link: http://data.sagepub.com/sagestats/6521
General Notes: *Median value gives the value for the "average" county for this metric, the 50th percentile of all counties reporting data. **Wastewater-treatment plant effluent that has been diverted for beneficial uses such as irrigation, industry, or thermoelectric cooling instead of being released to a natural waterway or aquifer.