The NIA Region 1, also known as Ilocos Region, comprises four (4) provinces, namely: Ilocos Norte, Ilocos Sur, La Union, and Pangasinan. It has a total land area of 1,260,592 hectares and a potential irrigable area of 264,491 hectares.
The total service area is 155,743.32 hectares, while the total firmed-up service area is 136,873.52 hectares. As of December 31, 2023 inventory report, NIA Regional Office 1 operates and maintains 29 National Irrigation Systems (NIS) and 1,185 Communal Irrigation Systems (CIS), serving more than 166,285 farmer-beneficiaries.
The following are the ongoing major irrigation projects in NIA RO1 as of December 31, 2023:
- Dumoloc Small Reservoir Irrigation Project, located in Bugallon, Pangasinan, has a service area of 1,632 hectares covering nine (9) Barangays in Bugallon that can benefit 1,484 farmer-beneficiaries.
- Bayaoas Small Reservoir Irrigation Project, located in Aguilar, Pangasinan, has a service area of 1,400 hectares covering five (5) barangays in Aguilar and three (3) barangays in Mangatarem that can benefit 958 farmer-beneficiaries.
- Sulvec Small Reservoir Irrigation Project in Sulbec, Pasuquin, Ilocos Norte, has a service area of 705 hectares covering ten (10) barangays in Pasuquin that can benefit 1045 farmer-beneficiaries.
- Gaco Small Reservoir Irrigation Project, located in Cabugao, Ilocos Sur, has a service area of 560 hectares in thirteen (13) barangays in Cabugao that can benefit 448 farmer-beneficiaries.
- Lower Agno River Irrigation System Improvement Project, with major diversion structures located in the Province of Pangasinan, has a service area of 9,305 hectares that can benefit 2,125 farmer-beneficiaries in four (4) municipalities in Pangasinan, two (2) in Tarlac, and one (1) in Nueva Ecija.