Errotatxo errota eta baserria

Errotatxo is a historic watermill with an attached farmhouse (baserri) in Mutiloa, a small municipality in the Goierri region of Gipuzkoa, in the Basque Country.

What will you see?

The heart of the site is the mill building itself — a rectangular structure roughly 14 by 6 metres that has survived to the present despite repeated repairs and alterations over the centuries. Attached at a right angle to its southern wall stands the farmhouse, forming the kind of compact rural complex typical of Basque villages.

What sets Errotatxo apart from other watermills in the area is how its wheels are powered. It's unusual for a single mill to draw water from two separate rivers, but that's exactly the case here: the Urresti (also called Zerain) flows in from the southwest, while the Mutiloa (also known as Troi) arrives from the northwest. Combining both flows into one working system was a clever piece of hydraulic engineering by the valley's earlier inhabitants.

The mill's origins trace back to the 16th century, though the earliest detailed records of its structure date from the early 17th century. Between 1612 and 1620, Pedro García de Cerain and José de Chiriboga carried out reform works on the building. Its name has shifted over time in historical documents — the current name, Errotatxo, has been in use since at least 1865, while older records referred to it as Eleizalde (a nod to the nearby San Miguel parish) or simply as Mutiloa. The 1890 census lists José Blas Tellería de Mujika as the mill's official miller.

After a period of decline, the mill underwent restoration work, and thanks to the efforts of Mutiloa's residents, its wheels now turn again under the force of the river water — a working mill you can actually see in motion, which is not something every historic mill in the region can offer.

How to get there?

Errotatxo sits along the Basque stretch of the Camino de Santiago (Camino del Norte), marked as one of the waypoints on the route through the Goierri region. Mutiloa itself lies inland among the hills of Gipuzkoa, and the easiest way to reach it is by car from nearby towns such as Ordizia or Zegama, following local roads into the valley. The mill and farmhouse stand within the village itself, close to its centre.

When to visit?

Spring and summer are the best times to visit, when river levels feeding the mill tend to be steadier and the surrounding walking routes — including the path to the nearby Lierniko Ama Birjinaren hermitage — are fully accessible. The Goierri region also occasionally hosts local festivals celebrating milling traditions in neighbouring villages, worth checking for during a visit.

Frequently asked questions

What makes Errotatxo different from a typical watermill? Its wheels are powered by water from two separate rivers, the Urresti/Zerain and the Mutiloa/Troi, a rare setup for a mill in this region.

Is the mill still working? Yes — following restoration work, the mill wheels once again turn under the force of the river water.

Where does the name Errotatxo come from? The name has been documented since at least 1865; earlier records call the site Eleizalde or Mutiloa, both tied to the nearby San Miguel parish.

Is Errotatxo on a pilgrimage route? Yes, it's one of the marked points along the Basque section of the Camino de Santiago passing through the Goierri region.