TTW Public Company Limited is a Thailand-based company engaged in the production and sale of treated water and provides service of production of water treatment and relating services of production and sales of treated water and treat wastewater. It is involved in the production and distribution of tap water to the Provincial Waterworks Authority (PWA) in the vicinity of West Bangkok. It operates through businesses: Fully-Integrated Water Management Business focuses on producing tap water and managing wastewater treatment in the Bang Pa-In Industrial Estate, Phranakorn Sri Ayutthaya. It also oversees water production systems, distributes water supply, and treats wastewater for Amata Nakorn Industrial Estate, Chonburi and Amata City Industrial Estate, Rayong; Water Supply Management Business, which produces and distributes tap water to the Provincial Waterworks Authority in Samutsakorn-Nakhonpathom and Pathumthani-Rangsit areas; and also involved in investment in other businesses.