Covered in tiles, this impluvium washhouse has a four-sided roof overlooking a rectangular basin. Its rainwater supply is supplemented by a spring. A corner stone shows that it was built in 1850 and that it was restored in 2011 thanks to the efforts of the Charmille association and the support of the Rolampont town council (of which Charmoilles is an associated municipality).
Lavoir de Charmoilles