The new NSQD Data Extraction and Analysis Tool can be accessed here.The purpose of this tool is to enable users to conduct initial data exploration enabling quick assessment of the type of data available for more in-depth analysis. Users are encouraged to download the full database for purposes of formal data analysis so that metadata accompanying sample results is properly considered during analysis. Additional features may be added to the data extraction tool in the future.
In 2001, the University of Alabama and the Center for Watershed Protection were awarded a U.S. Environmental Protection Agency, Office of Water 104(b)3 grant to collect and evaluate stormwater data from a portion of the NPDES (National Pollutant Discharge Elimination System) MS4 (municipal separate storm sewer system) stormwater permit holders. In 2008, the NSQD was updated with additional data under continued 104(b)3 support from the EPA. These stormwater quality data and site descriptions were collected and reviewed to describe the characteristics of national stormwater quality, to provide guidance for future sampling needs, and to enhance local stormwater management activities in areas having limited data. The monitoring data collected over nearly a ten-year period from more than 200 municipalities throughout the country have a great potential in characterizing the quality of stormwater runoff and comparing it against historical benchmarks. This project is creating a national database of stormwater monitoring data collected as part of the existing stormwater permit program, providing a scientific analysis of the data, and providing recommendations for improving the quality and management value of future NPDES monitoring efforts. Version 4.02 contains data from more than 9,000 events from about 200 municipalities throughout the country, representing multiple land uses.
Additional background and previous NSQD papers and analyses can be accessed here.