The filtering well of Saint Girons

In the 19th century, the water supply was still provided by dug wells that were liable to be contaminated, particularly by animal excrement, a real public health problem. Henri Crouzet, an engineer from the Ponts et Chaussées, found the solution by installing numerous filtering wells in the Landes. These wells are lined with a smooth lime-based coating that ensures a good seal on the walls. A layer of pebbles and charcoal at the bottom of the well also filters out undesirable organic components. In Saint-Girons, the first filtering well to be built was rediscovered by accident, during work in the town centre. Since then, a glass pyramid has protected this ingenious treasure and displayed it for passers-by to see.