The present book covers the crisis of freshwater resources and the need for wastewater in the Agriculture Sector. Different wastewater properties are elaborated on in this book. Basic treatment processes of wastewater have been covered. Some standard wastewater treatment methods are discussed here with some case studies. The feasibility of wastewater in agricultural irrigation purposes is also explained thoroughly with relevant case studies. This book also focuses on the application of the Internet of Things (IoT) and Artificial Intelligence (AI) in wastewater treatment system. Overall this book will provide fundamental knowledge of wastewater application in agriculture with some future scopes.