The scarcity of clean water is indeed a global challenge that impacts both human consumption and agricultural irrigation. Consequently, there are wastages of water resources and reductions in crop productions. Groundwater irrigation indeed has seen significant growth over the past few decades, becoming a vital source of water for agriculture worldwide. Various pathogens, nutrients, salts, and micropollutants reduced crop yields and, ultimately, food production. In semi-arid and arid regions, where water scarcity is more pronounced, efficient water management is essential for sustaining agricultural productivity and ensuring food security. However, even in humid climates where water availability may not be as limited, effective water management remains critical. Innovations in irrigation management and practices are indeed crucial, especially in regions where agriculture demands a significant amount of water. Over the past few years, nanotechnology has grown to be a crucial tool in many facets of environmental and water treatment. Examining various nanomaterials to sustainable irrigation water management involves assessing their effectiveness, scalability, and potential impact on productivity, equity, and sustainability. The objective of this chapter is to present nanotechnology-based methods for remediating water, which are essential to understanding and appraising the severity of the current state of affairs.