Archive of the EPA National Aquatic Resource Surveys (NARS)

This data product is an archived clone as of 29 April 2025 of the U.S. Environmental Protection Agency’s (EPA) National Aquatic Resource Surveys (NARS) program, capturing all publicly available datasets, technical reports, field and laboratory manuals, and associated metadata. The NARS program conducts nationwide surveys of the condition of the United States’ rivers, streams, lakes, coastal waters, and wetlands. This clone includes data from the National Rivers and Streams Assessment (NRSA), the National Lakes Assessment (NLA), the National Coastal Condition Assessment (NCCA), the Wadeable Streams Assessment (WSA), and the National Wetland Condition Assessment (NWCA)—as well as methodological documentation supporting field and analytical protocols. The archive preserves original file structures and naming conventions from the EPA’s releases, including a copy of the web table associating each data file with its associated metadata file. This dataset is intended for users seeking a complete reproducible copy of the NARS data ecosystem for scientific analysis, educational purposes, or environmental monitoring.本数据产品为2025年4月29日归档的美国环境保护署（U.S. Environmental Protection Agency, EPA）国家水生资源调查（National Aquatic Resource Surveys, NARS）项目存档克隆版本，收录所有公开可用的数据集、技术报告、野外与实验室手册及相关元数据。国家水生资源调查（NARS）项目负责开展美国境内河流、溪流、湖泊、近海水域及湿地健康状况的全国性普查。本次克隆版本包含全国河流与溪流评估（National Rivers and Streams Assessment, NRSA）、全国湖泊评估（National Lakes Assessment, NLA）、全国近岸状况评估（National Coastal Condition Assessment, NCCA）、可涉水溪流评估（Wadeable Streams Assessment, WSA）以及全国湿地状况评估（National Wetland Condition Assessment, NWCA）的相关数据，同时涵盖支撑野外作业与分析规程的方法学文档。该存档完整保留了EPA原始发布版本的文件结构与命名规范，其中包含将各数据文件与其关联元数据文件进行匹配的网页表格副本。本数据集面向需要完整可复现的NARS数据生态系统副本的用户，可应用于科学分析、教育教学或环境监测等场景。