The jurisdiction of the office is located in western Taiwan, bounded by the Dadu Mountain Platform and divided into two irrigation areas. One is the Taichung Basin between the eastern foot of the Dadu Mountain Platform and the Central Mountains; the other is the Dadu Mountain area including the coastal plains such as Dadu, Qingshui, Dajia, and Yuanli between the western foot of the platform and the western coast.

The geographical characteristics of irrigated areas are as follows:

The water source comes from three major water systems: Daan River, Dajia River and Wu River. The Wu River water system provides water to Taipingyi Canal and Datuliao Canal, and its tributary Toubiankeng River provides water to Toubiankeng Canal and Zhancuoyuan Canal. Its tributary Hanxi provides water to Liangshashu Lateral Canal, Wuzhangli Canal, Liangyi Lateral Canal and Axili Canal; its tributary Faizi River provides water to Zhigao Canal and Wangtian Canal, and the final section of Wu River water system is called Dadu River, from where Dadu Workstation diverts water. As the riverbed of Dadu River in this section is lower than Dadu Canal, the office set up a Dadu Canal Pumping Station at  Dadu Workstation to divert water from Dadu River for irrigation.

There are four types of geology within the jurisdiction. Yuanli Township, Miaoli County, Houli District, Xinshe District and Dadu District in Taichung City belong to the laterite layer, Dajia District and Qingshui District has sandy gray soil, and the rest of the area is loam and sandy loam.

The jurisdiction of the office covers all Greater Taichung City and the townships of Yuanli, Tongxiao, Zhuolan, and Sanyi in Miaoli County, with an irrigation area of 26,007 hectares.

The workstations in the irrigation jurisdiction areas from north to south are as follows:

Yuanli Station, Rinan Station, Shanjiau Station, Dajia Station, Da'an Station, Ciyao Station, Tai'an Station, Zhuolan Station, Yuemei Station, Tuntzuchiao Station, Qingshui Station, Fengyuan Station, Shalu Station, Daya Station, Danan Station, Dadu Station, Xitun Station, Tanzi Station, Babau Station, Wangtian Station, Nantun Station, Dali Station