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Map Layer Info

     
 
Major Surface-Water Sampling Sites in the National Water-Quality Assessment (NAWQA) Program: 1991 and 1994 Study-Unit Starts

What this map layer shows:

Sites where the National Water-Quality Assessment Program collects and analyzes information for more than 50 major river basins and aquifers.
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Background Information
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The National Water-Quality Assessment (NAWQA) Program collects and analyzes data and information for more than 50 major river basins and aquifers across the United States. The river basins and aquifers are grouped into geographic areas called study units. The NAWQA program looks at the condition of streams and ground water within the study units, at how those conditions are changing over time, and at how natural features and human activities affect those conditions. The goal of the program is to develop long-term consistent and comparable information to support sound management and policy decisions. The environmental data collected by NAWQA are accessible from the NAWQA Data Warehouse.

The NAWQA Program study units are divided into three groups, which are intensively studied on a rotational schedule over successive 3-year intervals. Study on the first group began in 1991, the second in 1994, and the third in 1997. The map layer for Major Surface-Water Sampling Sites in the National Water-Quality Assessment (NAWQA) Program: 1991 and 1994 Study-Unit Starts shows the location of 1,044 NAWQA sampling sites from the first two groups of study units. This map layer was compiled by the Water Resources Discipline of the U.S. Geological Survey. Descriptive information includes identification numbers and names, the type of sampling site, and the site latitude and longitude. Details of the design of the NAWQA Program, definitions of study components, and other background information are available in Design of the National Water-Quality Assessment Program. Additional water information is available through Water Science for Schools, which offers facts about water, along with pictures, data, maps, and an interactive center where you can express your opinions and test your water knowledge.

 

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NAWQA Surface Water Sites
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