The increasing demand for water in the arid and semi-arid regions has resulted in the emergence of wastewater application for agriculture. Using treated wastewater as marginal quality water in agriculture is a justified practice, yet care should be taken to minimize adverse environmental impacts and to prevent soil deterioration. Therefore, there is an urgent need to conserve and protect fresh water resources and to use the water of lower quality for irrigation. The use of treated wastewater for irrigation could be one of the main options to develop water resources in the Gaza Strip as it represents an additional marginal and reliable water resources. This book is divided into five chapters contains an introduction that gives an overview about book,objectives,and summarized methodology.In addition to an overview about wastewater reuse,the importance of wastewater reuse, Palestinian experiences of reusing treated wastewater, wastewater reuse in agriculture,wastewater reuse in the Gaza Strip, benefits and risks of wastewater reuse on agriculture,and regulations of treated wastewater. Also it presents the results and adiscussion of soil & water chemical analysis, and plant analyses.