The Heinz Center's State of the Nation's Ecosystems
ecosystem: Urban and Suburban Areas
indicator Name: Phosphorus in Urban and Suburban Streams
page # in printed report: 187
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
  1992-1998 Future
less than 0.1 ppm 31.6  
0.1 to 0.3 ppm 36.9  
0.3 to 0.5 ppm 21  
0.5 ppm or more 10.5