Returning to Chiavenna after the end of the conflict, he was professor and Dean of the Middle Schools of the Municipality of Chiavenna and continued his political activity in the context of the provincial Christian Democrats, tying himself particularly to Ezio Vanoni.

He was subsequently elected Senator for three terms and held numerous parliamentary and government posts, which nevertheless never induced him to leave out the intense political and economic activity in favor of his Province.

Appointed president of the BIM Consortium (Bacino Imbrifero Montano) of the Adda, a position he held until 1985, the year of his death,[1] thanks to a careful and insightful administration of the contributions of the over-rents that the producers of electricity paid to BIM, he worked in various initiatives aimed at improving the life and economy of its territory.

He also enhanced the zootechnical selection through the development of the herd book and the rehabilitation of the alpine brown cattle breed characteristic of the mountain area.

[2] In 1974 Athos Valsecchi together with other politicians (Giulio Andreotti, Giacinto Bosco, Mario Ferrari Aggradi, Mauro Ferri, Luigi Preti) was involved in the so-called "First oil scandal", accused of having benefited or favored funding from ENEL and political parties of government by the oil companies, In the case, being ministers,[3] the investigating commission for the prosecution proceedings took care of the investigations only carried out by Valsecchi and Ferri.