In 2007, there are 7 communal irrigation systems in the municipality: Tabon Tabon CIS, Gulang Gulang CIS, Gabao CIS Buenavista CIS, Burabod-S.J. CIS, Caracdacan CIS, and Carriedo CIS. It has a potential area of coverage of 1,191 hectares, which is 44% of the total area of rice lands. But the actual irrigated area is 839 during dry season and 900 during wet season. Water used for irrigation come from the Cadac-an River, Caracdacan River, Gumapia Spring, Tongdol River, Tuba River, Bagsangan Springs, Bulawan Spring, Milabigan Creek , Binurabudan Spring and other irrigation sources located in rural barangays.
The existing road networks of Irosin provide access to all its rural barangays to the urban center except for Cawayan, a mountain village. The Maharlika Highway is a main road artery linking the municipality to other places in the Philippines. The existing roads are classified into national, provincial, municipal and barangay roads. The national road has a length of 19.37 kilometers stretching from Bolos in the north to Casini in the south and Mapaso in the east. The provincial road in the municipality includes the whole length of the circumferential road that starts at barangay Gulang-Gulang, traversing Gabao, Tongdol, Gumapia, Batang, San Isidro up to Buenavista, and the roads going continue reading : Roads and Bridges