Source registry | Hydrionis

International and intergovernmental

Source	Coverage	Licence	Update
AQUASTAT — Global Information System on Water and AgricultureFAO	Global — approximately 200 countries and territories	Public but restricted	irregular
World Development IndicatorsWorld Bank	Global — 217 economies	Open — attribution required	annual
JMP global databaseJMP	Global — national, urban and rural estimates	Public but restricted	multi-year
SDG 6 Data PortalUN-Water	Global	Public but restricted	annual
Guidelines for Drinking-water QualityWHO	Global — guidance, not law in any jurisdiction	Public but restricted	irregular
State of Global Water ResourcesWMO	Global	Public but restricted	annual
UNEP Freshwater Ecosystems ExplorerUNEP	Global	Public but restricted	annual
United Nations World Water Development ReportUNESCO WWAP	Global	Open — attribution required	annual
Global Groundwater Information SystemIGRAC	Global — with emphasis on transboundary aquifers	Open — attribution required	irregular
OECD Environment Statistics — WaterOECD	OECD members and selected partner economies	Open — attribution required	annual
Water statisticsEurostat	EU member states, EFTA and candidate countries	Open — attribution required	annual
IBNET water utility benchmarking databaseIBNET	Global — 4,000+ utilities	Open — attribution required	irregular
GRACE and GRACE Follow-On terrestrial water storageNASA GRACE-FO	Global	Open	monthly
Global Precipitation Measurement — IMERGNASA GPM	Global, 60°N–60°S at full quality	Open	sub-daily
Global Surface Water ExplorerJRC	Global	Open — attribution required	annual
Waterbase — Water Quality ICM and UWWTDEEA	EEA member and cooperating countries	Open — attribution required	annual
Water Information System for EuropeWISE	European Union and EEA — water body level	Open — attribution required	multi-year
Rapid Mapping and Risk & Recovery MappingCopernicus EMS	Global, activated per event	Open — attribution required	irregular
Rhine water quality and discharge monitoringICPR	Rhine basin — Switzerland, France, Germany, Luxembourg, Netherlands	Public but restricted	annual
Danube basin water quality and management dataICPDR	Danube basin — 19 countries	Public but restricted	annual
North-East Atlantic marine assessment dataOSPAR	North-East Atlantic and contributing river basins	Open — attribution required	annual
Mekong hydrological and water quality monitoringMRC	the Mekong basin	Public but restricted	daily
African water and sanitation sector dataAfDB	Africa	Public but restricted	annual
IARC Monographs on the identification of carcinogenic hazardsIARC	Not geographic	Public but restricted	irregular
Water–energy nexus analysisIEA	Global	Public but restricted	annual
Desalination capacity and energy intensity assessmentsIRENA	Global	Open — attribution required	irregular

Regulators

Source	Coverage	Licence	Update
Drinking water quality in England and WalesDWI	England and Wales — water supply zone level	Open — attribution required	annual
Water company performance and price review dataOfwat	England and Wales — by appointed water company	Open — attribution required	annual
Water abstraction licence registerEA abstraction licensing	England — licensed abstractions	Open — attribution required	irregular
Analysis of the water industry’s annual water resources performanceEA water resources	England — 18 appointed water companies plus a national average	Open — attribution required	annual
Environment Agency open data catalogueEA	England	Open — attribution required	real-time
Hydrology Data Explorer APIEA	England — gauging stations and observation boreholes	Open — attribution required	daily
Water Quality Archive (WIMS)EA	England — sampling point level	Open — attribution required	monthly
Event Duration Monitoring — storm overflow spillsEA	England — by overflow site and water company	Open — attribution required	annual
Water abstraction licensing and returnsEA	England — catchment and licence level	Open — attribution required	annual
SEPA water environment dataSEPA	Scotland — 320 flow, 382 rainfall and 58 groundwater stations	Open — attribution required	sub-daily
Drinking water quality in ScotlandDWQR	Scotland — regulatory zone level	Open — attribution required	annual
Natural Resources Wales water dataNRW	Wales	Open — attribution required	daily
Northern Ireland water quality and environment dataNIEA	Northern Ireland	Open — attribution required	annual
Scottish water industry economic regulationWICS	Scotland	Open — attribution required	annual
Water bills, affordability and complaints dataCCW	England and Wales — by water company	Open — attribution required	annual
Legionella and water systems guidance (ACOP L8, HSG274)HSE	United Kingdom	Open — attribution required	irregular
Drinking Water Directive (EU) 2020/2184 and reportingEuropean Commission	European Union	Open — attribution required	irregular
Urban Waste Water Treatment Directive reportingEuropean Commission	European Union — agglomeration and plant level	Open — attribution required	multi-year
European Pollutant Release and Transfer Register / Industrial Emissions PortalE-PRTR	European Union, Iceland, Norway, Switzerland, Serbia	Open — attribution required	annual
European bathing water qualityEEA	European Union plus Albania and Switzerland — ~22,000 bathing waters	Open — attribution required	annual
Irish water quality and hydrometric dataEPA Ireland	Ireland	Open — attribution required	daily
Flemish environment agency water dataVMM	Belgium (Flanders)	Open — attribution required	daily
Safe Drinking Water Information SystemUS EPA	United States — ~150,000 public water systems	Open	quarterly
Unregulated Contaminant Monitoring Rule (UCMR)US EPA	United States — sampled public water systems	Open	multi-year
Enforcement and Compliance History OnlineUS EPA ECHO	United States	Open	monthly
Toxics Release InventoryUS EPA TRI	United States	Open	annual
HidroWeb and the Brazilian water resources reportsANA	Brazil	Open — attribution required	daily
Kenyan water resources monitoringWRA Kenya	Kenya	Public but restricted	annual
Impact — Kenyan water services performance reportWASREB	Kenya	Public but restricted	annual
Israeli water balance and reuse reportingIsrael Water Authority	Israel	Public but restricted	annual
EFSA scientific opinions on water-related substancesEFSA	European Union	Open — attribution required	irregular

Government and statistical offices

Source	Coverage	Licence	Update
Thermoelectric cooling water — EIA-923EIA	United States — around 740 generating stations	Open	annual
Annual Electric Generator Report — EIA-860EIA	United States — around 16,000 generating stations	Open	annual
California Data Exchange Center — reservoir storageCDEC	California — around 70 major reservoirs	Public but restricted	daily
Defra water statistics and policy dataDefra	England, some UK-wide	Open — attribution required	annual
Population, geography and environmental accountsONS	United Kingdom — all administrative levels	Open — attribution required	annual
OS OpenData — Boundary-Line, Open Rivers, Open NamesOS	Great Britain	Open — attribution required	quarterly
data.gov.uk open data portaldata.gov.uk	United Kingdom	Open — attribution required	daily
Scottish environmental data portal and statisticsScotland’s Environment	Scotland	Open — attribution required	annual
StatsWales environment and water statisticsStatsWales	Wales	Open — attribution required	annual
Northern Ireland statisticsNISRA	Northern Ireland	Open — attribution required	annual
Waterborne infectious disease surveillance and guidanceUKHSA	United Kingdom	Open — attribution required	weekly
UK legislation — water statutes and regulationslegislation.gov.uk	United Kingdom	Open — attribution required	daily
UK public procurement noticesContracts Finder	United Kingdom	Open — attribution required	daily
Planning application data and planning.data.gov.ukMHCLG	England	Open — attribution required	daily
UK company register and filing historyCompanies House	United Kingdom	Open — attribution required	daily
Tenders Electronic DailyTED	European Economic Area	Open — attribution required	daily
Eaufrance — the French water information systemEaufrance	France	Open — attribution required	daily
PEGELONLINE — German federal waterway gaugesPEGELONLINE (WSV)	Germany — 786 federal waterway gauges on 103 waters	Open	real-time
Gewässerkundlicher Dienst Bayern — Bavarian hydrological serviceGKD Bayern (LfU)	Bavaria — the Bavarian state gauging network	Open — attribution required	daily
Waterinfo — Dutch national water monitoringRijkswaterstaat	Netherlands — 705 water-level and 199 discharge locations	Open	real-time
German Environment Agency water dataUBA	Germany	Open — attribution required	annual
German water statistics (Wasserwirtschaft)Destatis	Germany	Open — attribution required	multi-year
Spanish water resources and reservoir monitoringMITECO	Spain	Open — attribution required	weekly
Italian environmental and water dataISPRA	Italy	Open — attribution required	annual
Italian water census (Censimento delle acque)ISTAT	Italy	Open — attribution required	multi-year
Dutch water use and wastewater statisticsCBS	the Netherlands	Open — attribution required	annual
Norwegian water resources and energy directorate dataNVE	Norway	Open — attribution required	daily
Danish environmental portal water dataMiljøportal	Denmark	Open — attribution required	annual
Swiss federal water and hydrology dataBAFU/FOEN	Switzerland	Open — attribution required	real-time
eHYD — Austrian hydrographic dataeHYD	Austria	Open — attribution required	daily
Sistema Nacional de Informação de Recursos HídricosSNIRH	Portugal	Open — attribution required	daily
Swedish hydrological observationsSMHI	Sweden — 720 discharge stations, 299 currently active	Open — attribution required	daily
Norwegian hydrological API (HydAPI)NVE HydAPI	Norway — national hydrological network	Open — attribution required	real-time
Hydrologiarajapinta — Finnish national hydrological archiveSyke	Finland — 711 discharge stations	Open — attribution required	daily
Irish national hydrometric networkOPW waterlevel.ie	Republic of Ireland — 2,007 station-sensor series	Open — attribution required	real-time
Irish hydrometric archive and station registerOPW Hydro-Data	Republic of Ireland	Public but restricted	real-time
Greek national databank for hydrological and meteorological informationHydroscope	Greece	Public but restricted	annual
Romanian national water administration dataANAR	Romania	Public but restricted	annual
Hungarian water directorate dataOVF	Hungary	Public but restricted	daily
Turkish State Hydraulic Works dataDSİ	Türkiye	Public but restricted	annual
Hydrométrie — French river flow and stageHub'Eau	France — around 6,500 hydrometric stations	Open — attribution required	daily
Qualité de l'eau potable — drinking waterHub'Eau / SISE-Eaux	France — commune and distribution unit level	Open — attribution required	monthly
Prélèvements en eau — abstraction databaseHub'Eau / BNPE	France — 193,000 abstraction points, department and commune level	Open — attribution required	annual
Indicateurs des services — service performanceHub'Eau / SISPEA	France — 68,000 service-year returns	Open — attribution required	annual
Reservoir operations and Colorado River dataUSBR	Western United States	Open	daily
California Data Exchange Center and SGMA groundwater dataCA DWR	California	Open	daily
HYDAT and the National Water Data ArchiveECCC	Canada	Open — attribution required	real-time
Guidelines for Canadian Drinking Water QualityHealth Canada	Canada	Open — attribution required	irregular
Estadísticas del Agua en México and SINACONAGUA	Mexico	Public but restricted	annual
Chilean water resources monitoringDGA	Chile	Public but restricted	daily
Australian Drinking Water GuidelinesNHMRC	Australia	Open — attribution required	irregular
Murray–Darling Basin water dataMDBA	Australia	Open — attribution required	daily
New Zealand regional water monitoringLAWA	New Zealand	Open — attribution required	monthly
Indian reservoir storage and river flow bulletinsCWC	India	Open — attribution required	weekly
Indian groundwater resource assessmentCGWB	India	Open — attribution required	annual
China Water Resources BulletinMWR China	China	Public but restricted	annual
Japanese water resources and river dataMLIT	Japan	Public but restricted	daily
Indonesian water resources dataPUPR	Indonesia	Public but restricted	annual
South African hydrological services and Green/Blue Drop reportingDWS South Africa	South Africa	Public but restricted	weekly
Egyptian water resources reportingMWRI Egypt	Egypt	Public but restricted	annual
Nigerian hydrological monitoring and flood outlookNIHSA	Nigeria	Public but restricted	annual
Moroccan dam storage and water resourcesMEE Morocco	Morocco	Public but restricted	daily
Saudi desalination and water supply dataSWA	Saudi Arabia	Public but restricted	annual
UAE water security and desalination dataMOCCAE	the United Arab Emirates	Public but restricted	annual
NIST Chemistry WebBook — thermophysical properties of waterNIST	Not geographic — physical constants	Open	static
PubChem chemical databasePubChem	Not geographic	Open	daily
Toxicological ProfilesATSDR	Not geographic	Open	irregular

Meteorological and hydrological services

Source	Coverage	Licence	Update
ERA5 global reanalysisECMWF / C3S	Global	Open — attribution required	daily
European and Global Drought ObservatoryCopernicus EMS	Europe and global	Open — attribution required	sub-daily
European and Global Flood Awareness SystemsEFAS / GloFAS	Europe (EFAS) and global (GloFAS)	Open — attribution required	daily
Water Bodies, Lake Water Quality and Lake Water Level productsCopernicus CLMS	Europe and global	Open — attribution required	daily
Global Fire Assimilation SystemCAMS	Global	Open — attribution required	daily
Oceanic Niño Index and ENSO monitoringNOAA CPC	Global — tropical Pacific index with worldwide teleconnections	Open	monthly
Global Historical Climatology Network and global climate reportsNOAA NCEI	Global — 100,000+ stations	Open	daily
Soil Moisture CCIESA CCI	Global	Open — attribution required	daily
HadUK-Grid gridded climate observationsMet Office	United Kingdom — 1 km grid, with published area series for nations, regions and counties	Open — attribution required	monthly
UK climate averages and station recordsMet Office	United Kingdom — stations and locations	Open — attribution required	monthly
UK Climate Projections 2018UKCP18	United Kingdom	Open — attribution required	static
SMHI open data — meteorology and hydrologySMHI	Sweden	Open — attribution required	real-time
Dane publiczne — hydrological observationsIMGW-PIB	Poland — 913 hydrological stations	Open — attribution required	real-time
Polish meteorological and hydrological dataIMGW-PIB	Poland	Open — attribution required	real-time
Czech hydrometeorological dataČHMÚ	Czechia	Public but restricted	daily
Icelandic meteorological and glaciological dataIMO Iceland	Iceland	Open — attribution required	daily
Peruvian hydrometeorological dataSENAMHI	Peru	Open — attribution required	daily
Colombian hydrology and environment dataIDEAM	Colombia	Open — attribution required	daily
Australian Water Information / National Water AccountBoM	Australia	Open — attribution required	daily

Geological surveys

Source	Coverage	Licence	Update
National Water Information SystemUSGS	United States and territories	Open	real-time
Watershed Boundary Dataset — hydrologic unit boundariesUSGS WBD	United States, Puerto Rico and the US Virgin Islands	Open	irregular
Estimated Use of Water in the United StatesUSGS	United States — state and county	Open	multi-year
Water Science School — Earth’s water distributionUSGS	Global	Open	static
Groundwater levels, aquifer mapping and baseline chemistryBGS	United Kingdom	Open — attribution required	monthly
Piézométrie — French groundwater levelsHub'Eau / ADES	France — 23,000+ piezometers	Open — attribution required	daily

Research institutes

Source	Coverage	Licence	Update
Global Runoff DatabaseGRDC	Global — 10,000+ gauging stations	Permission required	irregular
Global Burden of Disease — unsafe water, sanitation and handwashing risk factorsIHME	Global	Public but restricted	multi-year
MODIS snow cover and global glacier inventoriesNSIDC	Global	Open	daily
National River Flow ArchiveNRFA	United Kingdom — ~1,500 gauging stations	Permission required	daily
UK Hydrological Outlook and Monthly Hydrological SummaryUKCEH	United Kingdom	Open — attribution required	monthly
JRC water and drought research dataJRC	Europe and global	Open — attribution required	irregular
Finnish Environment Institute open water dataSYKE	Finland	Open — attribution required	daily
Argentine national water informationINA	Argentina	Public but restricted	daily

Academic

Source	Coverage	Licence	Update
HydroSHEDS / HydroRIVERS / HydroLAKES / HydroBASINSHydroSHEDS	Global	Open — attribution required	irregular
Global Reservoir and Dam DatabaseGRanD	Global — 7,000+ dams	Open — attribution required	irregular
Global Dam Watch harmonised dam and reservoir databaseGDW	Global	Open — attribution required	irregular
CRU TS gridded climate time seriesCRU	Global land areas	Open — attribution required	monthly
United States Drought MonitorUS Drought Monitor	United States	Open — attribution required	weekly
IAPWS formulations for the properties of waterIAPWS	Not geographic — physical constants	Public but restricted	irregular
Dietary Reference Intakes for Water and ElectrolytesNASEM	United States — widely cited internationally	Public but restricted	static
Open-access hydrology, water chemistry and water use researchLiterature	Global	Public but restricted	daily

Utilities

Source	Coverage	Licence	Update
Scottish Water annual performance and water quality reportingScottish Water	Scotland	Public but restricted	annual
Thames Water annual performance and water quality reportingThames Water	London and the Thames Valley	Public but restricted	annual
Severn Trent Water annual performance and water quality reportingSevern Trent Water	the English Midlands	Public but restricted	annual
United Utilities annual performance and water quality reportingUnited Utilities	North West England	Public but restricted	annual
Yorkshire Water annual performance and water quality reportingYorkshire Water	Yorkshire	Public but restricted	annual
Anglian Water annual performance and water quality reportingAnglian Water	eastern England	Public but restricted	annual
Southern Water annual performance and water quality reportingSouthern Water	south east England	Public but restricted	annual
South West Water annual performance and water quality reportingSouth West Water	south west England	Public but restricted	annual
Wessex Water annual performance and water quality reportingWessex Water	south west England	Public but restricted	annual
Northumbrian Water annual performance and water quality reportingNorthumbrian Water	north east England	Public but restricted	annual
Dŵr Cymru Welsh Water annual performance and water quality reportingDŵr Cymru Welsh Water	Wales and parts of western England	Public but restricted	annual
Northern Ireland Water annual performance and water quality reportingNorthern Ireland Water	Northern Ireland	Public but restricted	annual
Affinity Water annual performance and water quality reportingAffinity Water	parts of south east England	Public but restricted	annual
South East Water annual performance and water quality reportingSouth East Water	Kent, Sussex, Surrey, Hampshire and Berkshire	Public but restricted	annual
Portsmouth Water annual performance and water quality reportingPortsmouth Water	the Portsmouth area	Public but restricted	annual
SES Water annual performance and water quality reportingSES Water	Sutton and east Surrey	Public but restricted	annual
Bristol Water annual performance and water quality reportingBristol Water	the Bristol area	Public but restricted	annual
Cambridge Water annual performance and water quality reportingCambridge Water	the Cambridge area	Public but restricted	annual
South Staffs Water annual performance and water quality reportingSouth Staffs Water	the south Staffordshire area	Public but restricted	annual
Hafren Dyfrdwy annual performance and water quality reportingHafren Dyfrdwy	parts of north and mid Wales	Public but restricted	annual
Singapore water supply and NEWater reportingPUB	Singapore	Public but restricted	annual
Korean water resources management dataK-water	South Korea	Public but restricted	daily

Non-governmental organisations

Source	Coverage	Licence	Update
Aqueduct Water Risk Atlas 4.0WRI	Global — 13,000+ sub-basins, aggregated to country and province	Open — attribution required	multi-year
OpenStreetMapOSM	Global — coverage varies greatly by region	Open — attribution required	real-time
Water footprint of crops, products and nationsWFN	Global — national and sub-national crop footprints	Open — attribution required	static
CDP Water Security corporate disclosureCDP	Global — disclosing companies	Permission required	annual

Industry bodies

Source	Coverage	Licence	Update
IWA water loss and performance indicator frameworkIWA	Global — methodology	Public but restricted	static
UK water industry research programmeUKWIR	United Kingdom	Public but restricted	irregular
Water UK industry statistics and company reportingWater UK	United Kingdom	Public but restricted	annual
Europe’s Water in FiguresEurEau	Europe — approximately 30 countries	Public but restricted	multi-year
NSF/ANSI drinking water treatment unit standardsNSF/ANSI	International — primarily North America	Public but restricted	irregular
AWWA standards, water audits and utility benchmarkingAWWA	North America	Public but restricted	irregular
ISO water quality and water footprint standardsISO	International	Permission required	irregular

Commercial providers

Source	Coverage	Licence	Update
DesalData / GWI market intelligenceGWI	Global	Proprietary / paid	monthly
Published corporate sustainability and water reportsCorporate reporting	Global — reporting companies	Public but restricted	annual
Data centre efficiency surveysUptime Institute	Global	Proprietary / paid	annual