DISCLAIMER: This is a work in progress. The WSWC has compiled the links below as a convenience. Each state agency site is the authoritative source for its own data, definitions, and context. Agency roles and data availability vary by state; if you notice a broken link or have suggested updates, please contact WSWC.
This table serves as a centralized directory of state water management agencies across the western and central United States, providing direct links to their official data portals alongside summaries of their specific regulatory jurisdictions. Users can leverage this resource to efficiently locate, access, and download critical water-related datasets such as water rights registries, groundwater levels, well completion reports, and streamflow statistics. Users can use this information for conducting environmental research, navigating regulatory compliance, planning regional water supply projects, or performing spatial GIS analysis.
| State | Department Name / Link | Data Portal / Link(s) | Simple Tags |
| Arizona | Arizona Department of Environmental Quality (ADEQ) | ADEQ Water Quality Data | Water Quality, Permits, Map Viewer, Data Download/API |
| ADEQ eMaps & Data | Water Quality, Permits, Map Viewer | ||
| Arizona Department of Water Resources (ADWR) | ADWR Data Dashboards | Water Rights, Water Supply, Groundwater, Streamflow, Map Viewer, Data Download/API | |
| California | California Department of Water Resources (DWR) | CNRA Open Data | Water Supply, Reservoir Storage, Snowpack, Data Download/API |
| SGMA Portal | Groundwater, Water Supply, Administrative/Reports, Map Viewer | ||
| California State Water Resources Control Board (SWRCB) | CEDEN (Water Quality) | Water Quality, Environmental, Data Download/API | |
| CalWATRS System | Water Rights, Water Use, Map Viewer, Data Download/API | ||
| Colorado | Colorado Department of Public Health & Environment (CDPHE) | CDPHE Open Data | Public Health, Environmental, Map Viewer |
| Colorado Decision Support Systems (CDSS) | CDSS HydroBase | Water Rights, Water Use, Streamflow, Groundwater, Map Viewer, Data Download/API | |
| Colorado Water Conservation Board (CWCB) | CWCB Data Portal | Water Supply, Instream Flows, Map Viewer | |
| Idaho | Idaho Department of Environmental Quality (IDEQ) | IDEQ Water Quality Data | Water Quality, Map Viewer |
| Idaho Department of Water Resources (IDWR) | IDWR GIS & Data | Water Rights, Water Supply, Groundwater, Map Viewer, Data Download/API | |
| Kansas | Kansas Division of Water Resources (DWR) | WIMAS Portal | Water Rights, Water Use, Map Viewer, Data Download/API |
| Montana | Montana Department of Natural Resources and Conservation (DNRC) | DNRC Water Rights | Water Rights, Reservoir Storage, Map Viewer |
| Nebraska | Nebraska Department of Water, Energy, and Environment (NDWEE) | NDWEE Data | Water Quality, Permits, Groundwater |
| NeDNR Data Bank | Water Rights, Groundwater, Streamflow, Map Viewer, Data Download/API | ||
| Nevada | Nevada Division of Environmental Protection (NDEP) | NDEP Water Quality Map | Water Quality, Permits, Map Viewer |
| Nevada Division of Water Resources (NDWR) | NDWR Data Portal | Water Rights, Groundwater, Water Use, Data Download/API | |
| New Mexico | New Mexico Environment Department (NMED) | NMED Water Data | Water Quality, Public Health, Map Viewer |
| New Mexico Office of the State Engineer (OSE) | NMWRRS Database | Water Rights, Groundwater, Permits, Data Download/API | |
| North Dakota | North Dakota Department of Environmental Quality (NDDEQ) | NDDEQ Water Quality | Water Quality, Environmental, Map Viewer |
| North Dakota Department of Water Resources (NDDWR) | NDDWR GIS Data | Water Rights, Groundwater, Map Viewer, Data Download/API | |
| Oklahoma | Oklahoma Department of Environmental Quality (ODEQ) | ODEQ GIS & Data | Water Quality, Permits, Map Viewer, Data Download/API |
| Oklahoma Water Resources Board (OWRB) | OWRB Data & Maps | Water Rights, Groundwater, Water Quality, Map Viewer, Data Download/API | |
| Oregon | Oregon Department of Environmental Quality (ODEQ) | ODEQ AQWIA Portal | Water Quality, Environmental, Data Download/API |
| Oregon Water Resources Department (OWRD) | OWRD Data & Publications | Water Rights, Groundwater, Streamflow, Map Viewer, Data Download/API | |
| South Dakota | South Dakota Department of Agriculture and Natural Resources (DANR) | DANR Data & Maps | Water Rights, Water Quality, Permits, Map Viewer, Data Download/API |
| Texas | Texas Commission on Environmental Quality (TCEQ) | TCEQ Water Data | Water Rights, Water Quality, Map Viewer |
| Texas Water Development Board (TWDB) | TWDB Water Data | Groundwater, Water Supply, Map Viewer, Data Download/API | |
| Utah | Utah Department of Environmental Quality (DEQ) | Utah DEQ Open Data | Water Quality, Permits, Map Viewer, Data Download/API |
| Utah Division of Water Rights (DWRi) | Utah GIS Data | Water Rights, Permits, Map Viewer, Data Download/API | |
| Washington | Washington Department of Ecology | EIM System | Water Quality, Environmental, Data Download/API |
| Water Resources Explorer | Water Rights, Streamflow, Groundwater, Map Viewer, Data Download/API | ||
| Wyoming | Wyoming State Geological Survey (WSGS) | Groundwater Atlas | Map Viewer, Water Rights, Groundwater |
| Wyoming State Engineer’s Office (SEO) | SEO Data & Maps | Water Rights, Groundwater, Map Viewer, Data Download/API |