This guide provides comprehensive guidance on the planning, design, and installation of solar-powered water systems (SPWS). outlines best practices for harnessing solar energy to pump and deliver safe drinking water, especially in rural and off-grid communities. It includes technical design considerations, water source assessment, treatment requirements, operation and maintenance planning, and case studies from various countries. The guide concludes that SPWS can provide a cost-effective, environmentally friendly, and scalable solution for increasing access to safe water.