關於重複用水之政策，本校有設置中水及雨水回收系統。

本校在水資源回收方面，目前八甲校區污水處理廠處理後再生水100%進入植栽澆灌系統，進行校區植物澆灌；另國鼎圖書館雨水儲留系統則作為澆灌及沖廁之用，故八甲校區廢(污)水已達到零排放。至於二坪山校區，未來將對該校區立德樓及雙電大樓，規劃雨水回收系統，透過優化智慧水資源管理，充分運用水資源。 

With respect to the policy on water reuse, National United University has established both reclaimed water systems and rainwater harvesting systems.

In terms of water resource recycling, the wastewater treatment plant at the Bajia Campus achieves 100% reuse of treated effluent, which is redirected to the campus irrigation system for landscape watering. In addition, the rainwater retention system at the Guoding Library is utilized for irrigation and toilet flushing purposes, thereby enabling the Bajia Campus to attain zero wastewater discharge.

As for the Erpingshan Campus, the Lide Building and the Double-Electric Building are scheduled to incorporate rainwater harvesting systems in the near future. Through the optimization of an intelligent water resource management system, the University aims to ensure the efficient and sustainable utilization of water resources.