Hydroair Envirotech Private Limited · Alandur Pallavapuram Tambaram Hydroair Integrated Waste Management Company Private Limited · Hydroair Infrastructure Management (North) Private Limited · Hydroair Infrastructure Management (South) Private Limited · Hydroair Chennai Waste Management Private Limited · Hydroair Infrastructure Management (West) Private Limited · Pria Cetp (India) Limited · Hari Buildcon & Infraprojects Private Limited · Hydroair Tectonics (Pcd) Limited · Orbit Vyapaar Private Limited · Astor Tradecom Private Limited · U74140 Mh2001 Ptc133051