The Heinz Center's State of the Nation's Ecosystems
ecosystem: Urban and Suburban Areas
indicator Name: Nitrate in Urban and Suburban Streams
page # in printed report: 186
location on page: upper
data source: USGS National Water Quality Assessment. Coverage: lower 48 states. Each sampling area was sampled intensively for approximately 2 years during 1992-1998.
notes: please see technical notes for further details on accessing these data from their original source; this data table comes from a specific graphic in The State of the Nation's Ecosystems report (www.heinzctr.org/ecosystems)

units: % of all stream sites tested
  % of sites
1992-1998 Future
less than 0.1 ppm 2.6  
0.1 to 0.5 ppm 23.7  
0.5 to 1 ppm 34.2  
1 ppm or more 39.5