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Welcome to the
Permanent Service for Mean Sea Level (PSMSL)

PSMSL is the global data bank for long term sea level change information from tide gauges and bottom pressure recorders.

small icon for map-based data page small icon for table-based data page small icon for download all data page map of recently updated records Tide gauge records updated in the 30 days prior to
24 Nov 2025

About Us:

Learn about PSMSL, contact us, read news items and annual reports

Data:

Obtain and submit sea level data measured by tide gauges, GNSS receivers and bottom pressure recorders

Products:

Browse the data set via Google Earth or obtain derived products, view regional commentaries and author archives

Training & Information:

A wide variety of FAQs, training and software documentation, information on non-oceanographic signals in tide gauge records (e.g., glacial isostatic adjustment, atmospheric pressure, etc.)

Links:

Links to other networks and programs, as well as international sea level contacts

The PSMSL is based at and supported by the UK's National Oceanography Centre. We receive some funding from the UK's Natural Environment Research Council (NERC) but if you'd like to support us, please visit this link

Intergovernmental Oceanographic Commission logo World Data System logo Global Geodetic Observing System logo International Association of Geodesy logo Natural Environment Research Council logo