Decoppet grew up as the son of Henri-François, an innkeeper, and Philippine Alary.
He was the brother of Maurice Decoppet, a later forestry expert who managed the Swiss supply of firewood, construction wood and peat during the First World War, and the cousin of Lucien Decoppet, a lawyer, banker and politician.
[1] In 1888, Camille Decoppet passed the bar exam, and practiced law for two years.
From 1890 till 1896, he acted as a state prosecutor, followed by a tenure as a substitute judge at the Federal Supreme Court until 1912.
During his office time he held the following departments: He was President of the Confederation in 1916.