The Heinz Center's State of the Nation's Ecosystems
ecosystem: Urban and Suburban Areas
indicator Name: Chemical Contamination: Contaminants above Standards or Guidelines in Urban/Suburban Streams
page # in printed report: 189
location on page: middle
data source: Data Source: U.S. Geological Survey, National Water Quality Assessment Program (NAWQA). Coverage: lower 48 states. Note: Each sampling areas 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 sites with indicated number of exceedances
  1992-1998 Future
exceed 1 (aquatic life) 23.8  
exceed 2 or 3 (aquatic life) 38.1  
exceed 4 or more (aquatic life) 38.1  
 
exceed 1 (human health) 4.8  
exceed 2 or 3 (human health) 0  
exceed 4 or more (human health) 0