249 of the Office of the President of the Philippines, and based on the municipality's annual average income for CY 2004–2007 as certified by the Commission on Audit, and as implemented by Department of Finance Order No.

[6] On December 1, 2008, President Gloria Macapagal Arroyo designated the Municipality as an Agro-Ecological Destination in Cagayan Valley Region as recommended by the Department of Agriculture due to its vast ecological and agricultural production areas, as well as being the recipient of the Galing Pook Award 2007 for the best local governance programs.

This is in acknowledgment of local leaders' valuable efforts to promote munggo production, which is a high-value commercial commodity.

7160, also known as the Local Government Code of 1991, the municipality is responsible for coordinating and providing basic, regular, and direct services to its residents in order to promote social and economic development.

It is bounded on the north by Aurora, on the northeast by Cabatuan, on the east by Cauayan, on the east-southeast by Alicia, on the south by Ramon and on the west Alfonso Lista in the Province of Ifugao.

This type of climate is characterized by no pronounced maximum rain period with a short dry season lasting from one to three months.

As per data gathered from the ISU PAG-ASA PCARRD AGROMET Station, Echague, Isabela, the average monthly rainfall for 2011 was 238.20mm with the highest recorded at 558.20mm in September and at least in March with 32.6mm.

The soil type of San Mateo is 49.89% Santa Rita Clay Loam which is suited for lowland crops like rice, tobacco and mungo.

The excellent topography of the municipality has made irrigation by gravity method applicable in flooding of rice paddies.

Poverty Incidence of San Mateo Source: Philippine Statistics Authority[14][15][16][17][18][19][20][21] According to the 2020 Cities and Municipalities Competitiveness Index conducted by the National Competitiveness Council, San Mateo took the 141st spot among the first class and second class municipalities in the Philippines.

-Balatong festival is celebrated annually to honor and give thanks to God for the blessings and good abundance in harvesting Balatong or munggo, one of the primary product of the town.

also in the previous years san mateo conducting a pagent for Mr and mrs balatong, also, cookfest that a mainly dish is out of munggo.