The Heinz Center's State of the Nation's Ecosystems
ecosystem: Farmlands
indicator Name: Nitrate in Farmland Streams: ecosystem comparison
page # in printed report: 95
location on page: upper-middle
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 stream sites tested
  Farmlands Forests Urban
less than 2 ppm 52.336 100 81.579
2 to 6 ppm 29.907   18.421
6 to 10 ppm 8.411    
10 ppm or more 9.346