The municipality was created in 1836, by merging the now extinct Currelos and Oliveira do Conde municipalities. There was a place in Currelos called Carregal. Later it became known as “do Sal” (English: of salt) after the big salt evaporation ponds constructed there by order of Francisco Lucas de Melo Pais do Amaral (7 May 1752 – 6 April 1819), of Casa de Santar (Melo Pais do Amaral, and after Count of Santar).
Taking advantage of the location by the road, by then the major land connection between Viseu and Coimbra districts, Francisco Lucas de Melo Pais do Amaral therefore ordered the building of huge salt evaporation ponds in some lands he had inherited, which could supply the entire region. This business was kept in the hands of its descendants (Soares de Albergaria Pais e Melo) over almost 200 years, and consisted of collecting the salt from Figueira da Foz, transporting it by boat through Mondego and Dão rivers, up to Carregal, then laid in big warehouses, in the place named "Salinas" (English: salt evaporation ponds) in the town border, where Francisco Lucas de Melo Pais do Amaral ordered, moreover, the build of the house named after it, today the Museu Municipal Manuel Soares de Albergaria.