The Water Quality Portal integrates discrete water-quality data from over 400 state, federal, tribal, and local agencies for more than 2.7 million sites across the United States. It is maintained by the National Water Quality Monitoring Council and aggregates data from the U.S. Geological Survey and the U.S. Environmental Protection Agency. The portal provides an online query form to search and download results as CSV files.
Use Cases
- Analyze spatial trends in surface water contamination based on chemical, physical, and biological sample data.
- Monitor groundwater quality changes over time using historical data from the integrated national systems.
- Assess regulatory compliance and environmental impact by comparing data from multiple agency sources.
- Model correlations between land use and water quality parameters across diverse geographic sites.
Strengths
- Integrates data from over 400 distinct agencies, providing a multi-source perspective.
- Covers more than 2.7 million monitoring sites across the United States.
- Combines data from two major federal systems: USGS NWIS and EPA WQX.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment for large-scale ML tasks.
- Data may reflect geographic or agency-specific bias inherent to the contributing sources.
Provenance
- Source
- National Water Quality Monitoring Council, U.S. Geological Survey, U.S. Environmental Protection Agency.
- Collection Method
- Cooperative service integrating data from agency monitoring programs and data warehouses.
- Time Range
- null
- Freshness
- Last updated 2026-05-04 15:38:47; freshness should be verified.
- Geography
- United States