The Heinz Center's State of the Nation's Ecosystems
ecosystem: Urban and Suburban Areas
indicator Name: Nitrate in Urban and Suburban Streams: Ecosystem Comparison: Nitrate in Streams, 1992-1998
page # in printed report: 186
location on page: lower
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 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
  Farmlands Forests Urban
less than 2 ppm 52.3 100 81.6
2 to 6 ppm 29.9 0 18.4
6 to 10 ppm 8.4 0 0
10 ppm or more 9.3 0 0