NIA Region 1 has a total land area of 1,301,260 hectares. The potential irrigable area is 349,484 hectares covering the four (4) provinces of the region, namely: Ilocos Norte, Ilocos Sur, La Union and Pangasinan.
The total service area is 119,158 hectares while total firmed-up service area is 103,091 hectares, NIA RO 1 serves more than 125,800 farmer-beneficiaries. As of December 31, 2016 inventory report, the Regional Office operates and maintains 27 National Irrigation Systems (NIS) and 785 Communal Irrigation Systems (CIS).
The following are the major irrigation projects in NIA RO 1 as of December 31, 2016:
- San Fabian RIS in San Fabian, Pangasinan with 2,026 hectares of service area and serves 2,998 farmers. The three (3) towns being served by San Fabian RIS are San Jacinto, San Fabian and Manaoag, all in the 4th district of Pangasinan.
- Solsona RIS located in Solsona, Ilocos Norte covers the municipalities of Solsona and Dingras. Firmed-up service area is 1,340 hectares with 705 farmer-beneficiaries.
- Madongan RIS covers the municipalities of Dingras and Marcos, Ilocos Norte. Original service area is 3,621 hectares with firmed-up area of 2,027 hectares. The project benefits 2,157 farmers.
- Sulvec SRIP in the 1st district of Sulbec, Pasuquin, Ilocos Norte with a service area of 900 hectares. It covers nine (9) barangays in Pasuquin, namely: Caruan, Estancia, Nagsanga, Nalvo, Salpad, Pragata, Sulbec, Sulungan and Susugaen. It has 792 farmer-beneficiaries.
- Barbar SRIP situated in San Juan, Ilocos Sur extends to a 1,000-hectare service area. It covers eight (8) barangays of San Juan and two (2) barangays of Magsingal. This project has 1,667 farmer-beneficiaries.
- Masidem SRIP situated in Bani, Pangasinan with 440 farmers being served in a 600-hectare service area.
- Agno River Irrigation System Extension Project (ARISEP) is located in Tomana, Rosales, Pangasinan. This is one of NIA’s largest projects serving 12,894 hectares and benefitting 10,557 farmers. It covers eight (8) towns of the 6th district of Pangasinan, namely: Natividad, San Nicolas, San Quintin, Sta. Maria, Tayug, Balungao, Umingan and Rosales.