Dataset catalogue | Hydrionis

Published datasets

39,736,580

Observations covered

1806–2026

Temporal coverage

Automated pipelines

Datasets

Dataset	Observations	Coverage	Version	Licence position
Station Daily Climate Dataset 146 GHCN-Daily stations in the UK, Ireland, France, the Netherlands, Germany, Poland, Sweden, Finland, Norway, Canada and the United States	10,641,862	1814–2026 146 subjects · 267 series	v1.1.0	Commercial use permitted
Finland Historical River Discharge Dataset Finnish hydrological gauging stations reporting discharge	10,342,715	1847–2026 672 subjects · 672 series	v1.0.0	Commercial use permitted
Sweden Historical River Discharge Dataset Swedish hydrological gauging stations with a corrected archive	9,518,238	1851–2026 694 subjects · 694 series	v1.0.0	Commercial use permitted
United States Drought Index Dataset The 344 climate divisions of the contiguous United States	2,170,296	1895–2026 344 subjects · 1,376 series	v1.0.0	Commercial use permitted
England River Water Quality Dataset English freshwater river monitoring points with at least ten years of record	748,160	2000–2025 5,214 subjects · 51,207 series	v1.0.0	Commercial use permitted
Rural Air Chemistry Dataset United States CASTNET rural monitoring sites with a long record	731,344	1987–2026 123 subjects · 607 series	v1.0.0	Commercial use permitted
Dry Atmospheric Deposition Dataset United States CASTNET rural monitoring sites with a long record	700,709	1987–2026 105 subjects · 525 series	v1.0.0	Commercial use permitted
France River Flow Dataset French hydrometric sites with 30+ years of monthly record, capped at ten per department	646,543	1900–2026 896 subjects · 896 series	v1.0.0	Commercial use permitted
River Macroinvertebrate Community Dataset Environment Agency river macroinvertebrate monitoring sites in England with a long record	471,065	1965–2026 2,613 subjects · 10,452 series	v1.0.0	Commercial use permitted
Hydrionis Derived Climatology Dataset Every subject for which Hydrionis holds a sufficiently complete record	468,089	1827–2026 8,715 subjects · 28,140 series	v1.1.0	Restricted
Snow Water Equivalent Dataset Automated snow monitoring stations in the western United States and Alaska	376,964	1963–2026 851 subjects · 851 series	v1.0.0	Commercial use permitted
United States Drought Status Dataset The United States and each of the fifty states	355,980	2000–2026 51 subjects · 255 series	v1.0.0	Commercial use permitted
Scotland Hydrology Dataset Scottish SEPA flow, rainfall and groundwater stations with 10+ years of record	293,628	1929–2026 712 subjects · 712 series	v1.0.0	Commercial use permitted
England River Flow Dataset English gauging stations with a record opening before 1970	255,739	1879–2026 356 subjects · 711 series	v1.0.0	Commercial use permitted
Reclamation Reservoir Operations Dataset Bureau of Reclamation reservoirs with 20+ years of record, capped at twenty-five per Reclamation region	236,997	1905–2026 96 subjects · 298 series	v1.0.0	Commercial use permitted
England Groundwater Level Dataset English observation boreholes with a record opening before 1970	189,904	1836–2026 409 subjects · 782 series	v1.0.0	Commercial use permitted
United States Flood Peak Dataset United States Geological Survey streamgauges whose daily discharge record opens before 1930 and spans at least fifty years	175,042	1806–2025 2,236 subjects · 2,236 series	v1.0.0	Commercial use permitted
UK Historical Rainfall Dataset United Kingdom, four nations, twelve Met Office climate districts	173,673	1836–2026 375 subjects · 409 series	v1.0.0	Commercial use permitted
United States River Flow Dataset United States streamgauges opening before 1930 with 50+ years of published statistics	148,948	1874–2025 1,750 subjects · 1,750 series	v1.0.0	Commercial use permitted
Annual Runoff Depth Dataset United States gauging stations for which both an annual mean flow and a catchment area are held	144,212	1874–2025 1,687 subjects · 1,687 series	v1.0.0	Commercial use permitted
Crop Production and Irrigated Area Dataset Countries, as held by Hydrionis; FAO aggregates and unresolvable areas excluded	123,721	1961–2024 190 subjects · 2,503 series	v1.0.0	Restricted
River Aquatic Insect Richness Dataset Environment Agency river macroinvertebrate monitoring sites in England with a long record	117,866	1965–2026 2,613 subjects · 2,613 series	v1.0.0	Commercial use permitted
United States Groundwater Monitoring Dataset United States observation wells with 25+ years of record, capped at twelve per state; 103 wells across 35 states held so far	101,337	1942–2026 250 subjects · 250 series	v1.0.0	Commercial use permitted
United States Snow Hydrology Dataset United States automated snow stations, chiefly the mountain West, in 331 named subbasins	93,728	1963–2025 851 subjects · 2,553 series	v1.0.0	Commercial use permitted
Station Rainfall Totals Dataset The GHCN-Daily stations Hydrionis holds a daily rainfall record for, together with the UK areal series that carry a calculated reference average	85,788	1827–2026 163 subjects · 379 series	v1.0.0	Commercial use permitted
River Flow Regime Dataset The gauging stations Hydrionis holds at least five years of daily discharge for, which today are in Sweden and Finland	55,110	1847–2025 1,254 subjects · 4,575 series	v1.0.0	Commercial use permitted
United States Reservoir Storage Dataset United States reservoirs with 25+ years of record, capped at twelve per state	54,117	1914–2026 92 subjects · 92 series	v1.0.0	Commercial use permitted
Germany Federal Waterway Monitoring Dataset German federal waterway gauges reporting level or discharge	50,982	2026–2026 745 subjects · 832 series	v1.0.0	Commercial use permitted
Global Water Resources and Withdrawal Dataset Countries and territories	50,363	1961–2022 186 subjects · 1,263 series	v1.0.0	Commercial use permitted
River Fish Density Dataset Environment Agency electrofishing survey sites in England with at least five years of survey	49,554	1975–2026 1,808 subjects · 5,424 series	v1.0.0	Commercial use permitted
Wildfire Near Water Dataset United States river gauges, boreholes, monitoring stations and reservoir sites with a mapped fire within 50 km	48,816	1984–2019 1,356 subjects · 1,356 series	v1.0.0	Commercial use permitted
Ireland Water Level Dataset Irish hydrometric stations reporting against Ordnance Datum	30,857	2025–2026 451 subjects · 451 series	v1.0.0	Commercial use permitted
Forest, Cropland and Grassland Cover Dataset Countries, as held by Hydrionis; FAO aggregates and unresolvable areas excluded	16,336	1961–2025 202 subjects · 1,278 series	v1.0.0	Restricted
Hydrionis Industrial Cooling Water Dataset United States thermoelectric generating stations reporting cooling water	14,968	2014–2024 838 subjects · 1,716 series	v1.0.0	Commercial use permitted
Hydrionis Gauge–Water Linkage Dataset River gauges in jurisdictions whose publisher states the water body	14,277	1880–2010 2,086 subjects · 2,086 series	v1.0.0	Commercial use permitted
France Water Abstraction Dataset French departments and France	10,854	1970–2024 141 subjects · 670 series	v1.0.0	Commercial use permitted
European Water Abstraction Dataset European countries reporting to Eurostat	8,226	1970–2024 40 subjects · 410 series	v1.0.0	Commercial use permitted
France Water Service Performance Dataset French departments and France	8,209	2008–2019 102 subjects · 783 series	v1.0.0	Commercial use permitted
France Drinking Water Quality Dataset French departments, metropolitan and overseas	4,855	2022–2025 101 subjects · 1,387 series	v1.0.0	Commercial use permitted
Poland Hydrological Observations Dataset Polish national hydrological gauging stations	3,249	2026–2026 904 subjects · 1,640 series	v1.0.0	Commercial use permitted
Gauge Catchment Area Dataset The United States Geological Survey streamgauges Hydrionis holds discharge for	2,257	2026–2026 2,257 subjects · 2,257 series	v1.0.0	Commercial use permitted
Water and Wetland Bird Index Dataset United Kingdom and England	768	1975–2024 2 subjects · 16 series	v1.0.0	Commercial use permitted
England Water Company Performance Dataset Appointed water companies in England, plus the England-wide figure	234	2023–2024 18 subjects · 126 series	v1.0.0	Commercial use permitted
Hydrionis Facility Water Relationships Dataset United States thermoelectric generating stations reporting cooling water	0	– 0 subjects · 0 series	v1.0.0	Restricted

How to use these

Every dataset page carries a suggested citation, a changelog, the full list of contributing publishers and the limitations a professional user needs to read before relying on it. Values are available as CSV extracts and through the JSON API, and the fields are defined in the data dictionary.

Hydrionis does not silently change published data. When a method changes or a publisher revises history, the dataset version moves and the change is written into its changelog, so a figure cited six months ago can still be explained today.

For bulk extracts, higher-volume API access or commercial licensing, see data enquiries.