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National Aquatic Resource Surveys
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National Lakes Assessment

The National Lakes Assessment (NLA) is a statistical survey of the condition of our nation's lakes, ponds, and reservoirs. It is designed to provide information on the extent of lakes that support healthy biological condition and recreation, estimate how widespread major stressors are that impact lake quality, and provide insight into whether lakes nationwide are getting cleaner.


Quick Links
  • NLA 2017 Results Infographic (pdf) (73.45 KB)
  • Lakes Context Tool
  • Infographics about nutrients in lakes:  Should your lake be on a diet? (pdf) (812.8 KB) and  When Good Algae go Bad 2017 (pdf) (1.19 MB)

Basics of the NLA

  • Background of the NLA
  • Field and Lab Manuals

NLA Results

  • 2017 NLA Results
  • 2012 NLA Results
  • 2007 NLA Results

Explore the Data

  • NLA 2017 Dashboard
  • Download Data
  • Lakes Context Tool
  • National Aquatic Resource Surveys Home
  • Background
    • Indicators
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    • Map of Sampled Sites
  • NARS Data
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  • National Coastal Condition Assessment
  • National Lakes Assessment
  • National Rivers and Streams Assessment
  • National Wetland Condition Assessment
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Contact Us to ask a question, provide feedback, or report a problem.
Last updated on September 7, 2022
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