Background
He was born in Saint-Georges-de-Cacouna, Lower Canada, the son of Paschal Dumais and Éléonore Couillard, and was educated at Sainte-Anne-de-la-Pocatière.
He was born in Saint-Georges-de-Cacouna, Lower Canada, the son of Paschal Dumais and Éléonore Couillard, and was educated at Sainte-Anne-de-la-Pocatière.
He represented Chicoutimi-Saguenay in the Legislative Assembly of Quebec from 1888 to 1890 as a Parti National member. Dumais articled with his father and then F.S. McKey, qualified to practise as a notary in 1864 and set up practice in Hébertville. Dumais was mayor of Hébertville from 1881 to 1890.
In 1899, he was named a crown lands agent.
He also served as a lieutenant in the militia. Dumais ran unsuccessfully for a seat in the Quebec assembly in 1886, losing to Élie Saint-Hilaire.
He was elected to the assembly in an 1888 by-election held after Saint-Hilaire"s death and was defeated when he ran for reelection in 1890. Dumais died in Hébertville at the age of 67.