It was the former president Carlos P. Garcia inspired Aumentado to enter into politics in 1967. At age 27, he became the youngest provincial board member when he was elected in 1967. In 1988, he was elected as vice governor of Bohol. In 1992, he was elected as representative of Bohol's 2nd District and served for three consecutive terms until 2001. Aumentado became a Deputy Speaker in the House of Representatives at 11th Congress from 2000 to 2001. He also held the chairmanship of Ethics and Privileges Committee and a consistent member for the minority of the committees such as Agriculture and Food; Appropriations; Basic Education and Culture; Constitutional Amendments; Good Government and Public Accountability; Local Government; Public Works and Highways; Suffrage and Electoral Reforms; Tourism; Transportation; and Ways and Means. He was the governor of Bohol for three consecutive terms, chairman of both the Regional Development Council and the Regional Tourism Council of Central Visayas, and National President of the League of Provinces of the Philippines and the Union of Local Authorities of the Philippines, the umbrella organization of the 1.5M local officials of the Philippines. He is the 1st Boholano ever elected to these positions. After his stint as governor, he returned to Congress in 2010 until 2012. His youngest son, Erico Aristotle Aumentado continued his remaining term.
Passed Bills
Limited Portability Scheme
Philippine Health Insurance Corporation Act of 1995
Agricultural Tariffication Act of 1998
GSIS Act of 1997
Agricultural and Fisheries Modernization Act of 1998
Home Guaranty Corporation Act of 2000
Fair Election Act
Awards and recognition
Outstanding Student Leader Rafael Palma College, 1959 – 1961.
Pres. Garcia Gold Medal Award in Oratory given by Pres. Carlos P. Garcia, 1961.
Columnist of the Year Award, given by the Bohol Association of Writers and Radio Announcers,1988–1989.
Plaque of Recognition for his invaluable service and dedication to the ideals and objectives of the Integrated Bar of the Philippines, given by the IBP – Bohol Chapter, 1993.
Ten Outstanding Congressmen, Philippine House of Representatives 1995.
Top Ten Performing Members in the 10th Congress, Philippine House of Representatives, by the Philippine News Agency, 1997.
Top Ten Outstanding Congressional Achiever, 11th Congress, Philippine House of Representatives, 2000.
Most Outstanding Boholano Achiever chosen by the Bohol Association in Metro Manila, Inc., 2000
Plaque of Recognition for his meritorious achievement and monumental accomplishments as the Province of Bohol’s Representative of the Second District and as Deputy Speaker of the Philippine House of Representatives’ 11th Congress, 2001.
Konrad Adenauer Medal of Excellence, given by Konrad-Adenauer-Stiftung Philippines and administered by the Local Government Development Foundation, 2006.