Where the numbers come from
Every number on this site comes from one of these 12 sources, read by our own jobs and shown with the source's credit and licence. Updated .
Every source we read
- PEGELONLINE
- Rijkswaterstaat
- Environment Agency
- National Water Prediction Service
- U.S. Bureau of Reclamation
- NOAA CO-OPS
| Source | Dataset | Licence | Terms | Terms read | Newest successful run |
|---|---|---|---|---|---|
| PEGELONLINE REST API v2 (WSV, operated by ITZBund) | German federal waterway gauges (PEGELONLINE) | Datenlizenz Deutschland Zero 2.0 (dl-de/zero-2-0): "Die bereitgestellten Daten und Metadaten dürfen für die kommerzielle und nicht kommerzielle Nutzung insbesondere vervielfältigt, ausgedruckt, präsentiert, verändert, bearbeitet sowie an Dritte übermittelt werden" | https://pegelonline.wsv.de/gast/nutzungsbedingungen | 1 October 2026 | 5 October 2026 |
| PEGELONLINE download form for long-term raw water levels | German federal waterway gauges (PEGELONLINE) | Datenlizenz Deutschland Zero 2.0 (dl-de/zero-2-0): "Die bereitgestellten Daten und Metadaten dürfen für die kommerzielle und nicht kommerzielle Nutzung insbesondere vervielfältigt, ausgedruckt, präsentiert, verändert, bearbeitet sowie an Dritte übermittelt werden"; each zip says "Bei der Verwendung der Daten gelten die Nutzungsbedingungen von PEGELONLINE unter https://pegelonline.wsv.de/gast/nutzungsbedingungen". The values are "ungeprüfte Rohdaten" (unchecked raw data, https://pegelonline.wsv.de/gast/hilfe) | https://pegelonline.wsv.de/gast/nutzungsbedingungen | 2 October 2026 | 5 October 2026 |
| Rijkswaterstaat | Dutch river and lake levels (Rijkswaterstaat WaterWebservices) | CC0: "Op de inhoud van de WaterWebservices is de Creative Commons zero verklaring (CC0) van toepassing. Dit houdt in dat hergebruik van de inhoud van deze service is toegestaan, tenzij bij een bepaald onderdeel staat aangegeven dat een auteursrechtelijke uitzondering van toepassing is." Credit "Rijkswaterstaat" as a courtesy (not required) | https://rijkswaterstaatdata.nl/waterdata/ | 1 October 2026 | 5 October 2026 |
| This uses Environment Agency flood and river level data from the real-time data API (Beta) | England river levels (Environment Agency flood-monitoring and Hydrology APIs) | Open Government Licence v3.0: "These APIs are provided as open data under the Open Government Licence with no requirement for registration." Credit, in the EA's words: "this uses Environment Agency flood and river level data from the real-time data API (Beta)" | https://environment.data.gov.uk/flood-monitoring/doc/reference | 1 October 2026 | 5 October 2026 |
| This uses Environment Agency flood and river level data from the real-time data API (Beta) | England river levels (Environment Agency flood-monitoring and Hydrology APIs) | Open Government Licence v3.0 (part of the flood-monitoring API, same terms and the same credit: "this uses Environment Agency flood and river level data from the real-time data API (Beta)") | https://environment.data.gov.uk/flood-monitoring/doc/reference | 1 October 2026 | 5 October 2026 |
| U.S. Geological Survey | US rivers, lakes and reservoirs (USGS Water Data API) | Public domain: "USGS-authored or produced data and information are considered to be in the U.S. Public Domain." Credit: "U.S. Geological Survey". Recent data is provisional and can be revised (https://waterdata.usgs.gov/provisional-data-statement/): show it as provisional | https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits | 1 October 2026 | not yet |
| NOAA National Water Prediction Service (NWPS) | US river gauges, flood categories and archives (NOAA NWPS) | Public domain (NWS disclaimer): "The information on National Weather Service (NWS) Web pages are in the public domain, unless specifically noted otherwise" and it "may be used without charge for any lawful purpose so long as you do not: 1) claim it is your own ... 2) use it in a manner that implies an endorsement or affiliation with NOAA/NWS, or 3) modify its content and then present it as official government material". Third parties named in dataAttribution (USGS, USACE, state agencies) are credited with the data | https://www.weather.gov/disclaimer | 1 October 2026 | 5 October 2026 |
| NOAA National Water Prediction Service (NWPS) | US river gauges, latest readings (NOAA NWPS gauge list) | Public domain (NWS disclaimer): "The information on National Weather Service (NWS) Web pages are in the public domain, unless specifically noted otherwise" and it "may be used without charge for any lawful purpose so long as you do not: 1) claim it is your own ... 2) use it in a manner that implies an endorsement or affiliation with NOAA/NWS, or 3) modify its content and then present it as official government material" | https://www.weather.gov/disclaimer | 1 October 2026 | 5 October 2026 |
| U.S. Bureau of Reclamation | US Bureau of Reclamation reservoirs (Lake Mead, Lake Powell) and the 24-Month Study | Public domain (US federal work): "Generally, materials produced by federal agencies are in the public domain and may be reproduced without permission." Credit "U.S. Bureau of Reclamation". Values are provisional and can be revised. | https://www.doi.gov/copyright | 2 October 2026 | 5 October 2026 |
| U.S. Bureau of Reclamation | US Bureau of Reclamation reservoirs (Lake Mead, Lake Powell) and the 24-Month Study | Public domain (US federal work): "Generally, materials produced by federal agencies are in the public domain and may be reproduced without permission." Credit "U.S. Bureau of Reclamation". | https://www.doi.gov/copyright | 2 October 2026 | 5 October 2026 |
| U.S. Bureau of Reclamation | Place registry of https://worldwaterlevels.com (one row per page, its series, zeros and levels) | Public domain (US federal work): "Generally, materials produced by federal agencies are in the public domain and may be reproduced without permission." Credit "U.S. Bureau of Reclamation". Reclamation's disclaimer page (https://www.usbr.gov/main/disclaimer.html) applies the Department of the Interior's policy. | https://www.doi.gov/copyright | 3 October 2026 | 5 October 2026 |
| NOAA National Ocean Service, CO-OPS | Great Lakes water levels (NOAA CO-OPS stations) | Public domain, US government work: "The information on government servers are in the public domain, unless specifically annotated otherwise, and may be used freely by the public." Credit: "NOS requests that attribution be given whenever NOS material is reproduced and re-disseminated." (NOAA National Ocean Service, CO-OPS) | https://tidesandcurrents.noaa.gov/disclaimers.html | 2 October 2026 | 5 October 2026 |