National Water Information System

The National Water Information System (NWIS) is a comprehensive database managed by the U.S. Geological Survey that collects, stores, and provides access to water data across the United States. It includes information on river flows, groundwater levels, water quality, and precipitation. This system helps scientists, policymakers, and the public monitor water resources, assess environmental health, and support water management decisions. By offering real-time and historical data, NWIS plays a vital role in understanding and managing the nation's water resources effectively.