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Located in Baliarrain, it has a length of 232 meters and a height of 63 m above the water bed. It holds 7.53 cubic hectometers and supplies drinking water to the area’s nearly 60,000 inhabitants.

The bridge over the Skawa River, with a length of 242.95 m, is one of the essential structures of the Zembrzyce road bypass. The structure design aimed at respecting and adapting to the mountainous landscape.

The new treatment plant has replaced the obsolete facility of Gigablok, in operation since 1981. The project entailed the execution of more than 40 buildings and structures of various functions and dimensions. The key to the construction work was to supply the corresponding material on time, to perform works simultaneously, and to layout the various systems precisely. All this required the most experienced engineers in working with complicated structures.

The Second Road Bypass of San Sebastián, connected to the Urumea and to the N-1 highways, decongests the road access to the city and provides alternatives for local and long distance traffic through the region.