New National Database Reveals How Americans Use Water
Water is essential for life, powering agriculture, industry, and our daily needs. For the first time, a comprehensive national picture of U.S. Water usage is available thanks to the United States Water Withdrawals Database, created by researchers at Virginia Tech. This new resource tracks who is drawing water from rivers, lakes, and underground aquifers, and in what quantities, offering critical insights for effective water management.
The United States Water Withdrawals Database: A First-of-Its-Kind Resource
Developed by Landon Marston, an associate professor of civil and environmental engineering at Virginia Tech, and his doctoral student Yunus Naseri, the database is the first nationwide resource to compile detailed water withdrawal data. The research was published in Nature Scientific Data and is now publicly accessible to communities and policymakers. The database includes:
- 188,857 unique water users
- 353,694 points of diversion and use
- 58 million withdrawal volumes
- 7.5 million individual records
Why This Data Matters
Access to this level of detail is increasingly important as communities grapple with water stress due to droughts, climate change, and population growth. “Effective water management in the United States has been hampered by a critical data gap: we understand far more about water supply than about who uses water, how much they withdraw, and where and when that water is used,” explains Marston.
The database allows communities to analyze seasonal changes in water use, identify the sectors consuming the most water in a region, and track long-term trends. This information can inform smarter planning, conservation efforts, and sustainable water management practices.
Overcoming Data Fragmentation
For decades, water withdrawal records were fragmented, inconsistent, and challenging to access. While 43 out of 50 states require large water users to report their withdrawals annually, each state had its own unique rules, reporting requirements, and data formats. Some states made data publicly available online, while others required formal requests for access, hindering national-level analysis.
The research team collaborated with all 50 state agencies, successfully collecting and standardizing records from 42 states, some dating back over a century.
Key Findings from the Database
Initial analysis of the database revealed significant insights:
- Agricultural irrigation accounts for 51 percent of all recorded water withdrawal entries.
- The power sector, including hydroelectric dams and power plant cooling, withdraws the largest total volume of water annually.
The database specifically tracks “self-supplied” water withdrawals – water drawn directly from a source by users like power plants, mines, and public water systems. This includes both groundwater and surface water, with monthly and annual data available.
Limitations and Future Improvements
The United States Water Withdrawals Database (USWWD) is not a complete census of all water use in the U.S., and data coverage varies by state. Only about a quarter of reported water withdrawals are directly measured using meters; the majority rely on estimates. This underscores the need for improved monitoring infrastructure and consistent measurement practices nationwide.
“Creating USWWD revealed the real problem with how we record water use data,” says Naseri. “Each state collects water data differently, and there’s no central system to bring it together automatically. We need a unified, easily accessible database that both people and AI can use to discover better ways to manage our water resources.”
Accessing the Data
Despite its limitations, the USWWD is the most detailed national resource of its kind. It adheres to FAIR data principles – findable, accessible, interoperable, and reusable – making it valuable for researchers, policymakers, and water managers. The database provides an unprecedented foundation for studying water use trends across regions, sectors, and decades.
As water supplies dwindle in many regions, a clear understanding of water demand is crucial for effective resource management. The United States Water Withdrawals Database offers a vital tool for making informed decisions about our most precious resource.