Having weaned from the bosom of former Barrio Tumapoc, Barangay Lower Tumapoc traces most of its history from Barrio Tumapoc (please refer to the brief history of Barangay Upper Tumapoc).  According to stories that have been almost forgotten by generations, a wide area of the barrio was burned gutting the forests, kaingins and rice fields.  As strong rains washed all the remnants of the fire from the mountains, the flow of water carried and scattered these near the foot of the mountains (where Lower Tumapoc is now located).  This particular area became so ugly and dirty that early Ibaloi settlers referred the place as Dugduguit meaning “dirty or ugly” so much so that long before it was separated as another barangay, they called and refer the place as “Dugduguit”.

Due to the strong clamor of the people of Barrio Tumapoc that it be divided into two barangays and to receive more development funds from the Government, the lower portion of the barrio was segregated as one barangay in 1968 by virtue of Provincial Board Resolution No. 531 and stating thereon the name of the place as “Lower Tumapoc”.  Mr. Alfredo Estioco, a respected leader in the community, was chosen as the first barangay captain.  Enthusiastic as he was, Mr.  Alfredo Estioco led the barangay for 13 years (1968-1981).  Vicente Apilado, who was then the barrio captain of the whole barrio Tumapoc during the separation, continued to lead the other barangay also name as “Upper Tumapoc”.

Barangay Lower Tumapoc lies between mountains and is guarded at the West by the Sulbuan-Caoayan-Ribsuan River and Surnip River in the North.  It is bounded on the East by Upper Tumapoc; on the West by Casilagan, Naguilian, La Union; on the North by Barangay Delles; and on the South by Barangay Dalacdac. It covers an area of 66.5014 hectares of which about 70% of it is rice fields.  Like other barangays in the Municipality, the climate it temperately hot.

The barangay is occupied with 332 (in 2015) people who are predominantly Ilocanos tracing their roots from Naguilian, La Union and other provinces like Pangasinan and Ilocos Sur.

The people are mostly farmers who plant rice thrice a year, thus, producing tons of palay that are sold to neighboring towns; thus, considered as the Rice Granary of the Municipality of Burgos.  The river contributed to the well-managed irrigation system of the locality.  Various fruit trees, especially mango trees, are found everywhere in the barangay which also contribute to the income of the people.  Tiger grass (boyboy) is abundant making the place as one of the sources of good boyboy brooms.

Farmer residents bring and transport their farm produce to the markets through the Lower Tumapoc-Upper Tumapoc-Bilis Barangay  Roads up to New Poblacion with a total approximately distance of 6.0 kilometers. An elementary school stands at the breast of a hill openly welcoming every child who wishes to be educated.  Barangay plaza and basketball court are constructed near the rice fields while a barangay hall stands at the southern portion of the barangay.