Release Notes

Release notes for the final four releases of OS MasterMap Water Network Layer.

Product has reached its End of Life (withdrawal) date

The OS MasterMap Water Network Layer product (also referred to as OS MasterMap Networks – Water Layer) reached its End of Life on 31 March 2026. As of this date, Ordnance Survey ceased to maintain or publish updates to the product, and access to the product was removed from the OS Data Hub, OS Features API and OS Vector Tile API.

Supporting product documentation will be removed from this site 12 months after this date, when access to existing data packages in the OS Data Hub is no longer available. Full details, including migration information and FAQs, are available on the OS MasterMap Water Network Layer End of Life information page.

OS MasterMap Water Network Layer – January 2026 release note

This release note provides information about the January 2026 release of OS MasterMap Water Network Layer. This is the final release of the product.

OS MasterMap Water Network Layer – October 2025 release note

This release note provides information about the October 2025 release of OS MasterMap Water Network Layer.

OS MasterMap Water Network Layer – July 2025 release note

This release note provides information about the July 2025 release of OS MasterMap Water Network Layer.

OS MasterMap Water Network Layer – April 2025 release note

This release note provides information about the April 2025 release of OS MasterMap Water Network Layer.