Extracted Data From: EPA National Lakes Assessment

This submission includes publicly available data extracted in its original form. Please reference the Related Publication listed here for source and citation information. Data included are EPA National Lakes Assessment survey results from 2022, 2017, 2012 and 2007 for all states. All collected data and geospatial shape files are uploaded in zipped files. Corresponding metadata files are included for each dataset. Field and lab manuals, design documents, and quality assurance plans are included for each survey, as well. “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.” [Quote from https://www.epa.gov/national-aquatic-resource-surveys/nla on 2025-12-07.] “The [National Lakes Assessment 2022, 2017, 2012, and 2007] data were a result of the collective efforts of dedicated field crews, laboratory staff, data management and quality control staff, analysts and many others from EPA, states, tribes, federal agencies, universities, and other organizations. Please contact [e-mail] with any questions.” [Quote from https://www.epa.gov/national-aquatic-resource-surveys/frequent-questions-about-data-national-aquatic-resource-surveys on 2025-12-07.]