Until after the Second World War, there were swimming baths on the island. Le Pecq was famous for two other establishments related to water: a spa exploiting springs on St-Germain hill and a natural water swimming pool which was 100 metres long with sand beaches.
Prior to the conclusion of World War II, the island boasted public bathing facilities. Le Pecq earned recognition for its two notable establishments connected to water: a spa situated near mineral springs on St-Germain hill and a natural swimming pool with sandy shores that measured 100 meters in length.