Due to the increasingly severe flooding, drought, and landslides in the lower northern provinces of Thailand, and in order to effectively manage water resources and address water-related problems in the area, and to meet the needs of the people comprehensively and quickly, and to maximize benefits for the people in the area, the Department of Water Resources deemed it appropriate to establish the Regional Water Resources Office 9. This central government agency was established in Phitsanulok Province, pursuant to the Ministry of Natural Resources and Environment's Order No. 77/2547 dated March 2, 2004, and the Ministerial Regulation on the Division of Government Agencies of the Department of Water Resources, Ministry of Natural Resources and Environment (No. 2), B.E. 2551 (2008). The responsibilities were transferred from the Regional Water Resources Office 1, located in Lampang Province.
The Regional Water Resources Office 9, as assigned by the Department of Water Resources, is responsible for the Yom and Nan river basins, covering a total of six provinces: Nan, Phrae, Uttaradit, Sukhothai, Phitsanulok, and Phichit.
History of the establishment of the Regional Water Resources Office 9.
- From April 2005 to August 2005, a temporary office was established at the Water Management Division building (Phitsanulok), located within the grounds of the Regional Environmental Office 3, Wang Thong District, Phitsanulok Province.
- September 2005 – October 2009: Established a temporary office at Pibulsongkram Rajabhat University (Airport Campus), Sanam Bin Road, Mueang District, Phitsanulok Province.
- November 2009 – August 2015: Temporary office established at 625/10 Pichai Songkhram Road, Nai Mueang Subdistrict, Mueang District, Phitsanulok Province.
- Currently, the permanent office is located at 819 Moo 8, Wang Thong Subdistrict, Wang Thong District, Phitsanulok Province.
