The Service de Sécurité Incendie de Saint-Antoine-de-l'Isle-aux-Grues serves the municipality of Saint-Antoine-de-l'Isle-aux-Grues, an island in the St. Lawrence River. The department covers a population of 145 citizens and a 24.16 km2. The fire department is not part of any mutual aid agreement, but in extreme cases the city of Montmagny can send apparatus by ferry.