Innovative Solutions and Sustainable Strategies to Wash in the Era of Open Defecation Towards a More Climate-Resilient Bauchi Built Environment (2025-2030)

Open defecation remains a major public health, environmental, social, and built-environment challenge in Nigeria. It exposes communities to faecal contamination, contributes to disease transmission, undermines dignity, and becomes more hazardous when floods, droughts, heatwaves, and other climate stresses damage sanitation infrastructure. This study examines innovative solutions and sustainable strategies for water, sanitation, and hygiene, with emphasis on the transition from open defecation towards a more climate-resilient built environment between 2025 and 2030. The study used an integrative mixed-evidence design. The quantitative component synthesized secondary indicators from Nigeria's Water, Sanitation and Hygiene National Outcome Routine Mapping, Joint Monitoring Programme materials, and a recent Bauchi State climate-resilient WASH policy brief. The qualitative component used thematic document analysis of policy instruments, technical reports, and recent institutional literature. The quantitative evidence indicates substantial national and Bauchi-specific deficits, including persistent open defecation, unsafe water, inadequate hygiene facilities, and severe WASH gaps in schools and health facilities. The qualitative analysis identified nine interrelated themes: affordability, social norms, climate hazards, water quality, resilient design, operation and maintenance, governance, equity, and digital accountability. The paper proposes a five-part strategy: climate-smart sanitation design, safely managed sanitation chains, inclusive community-led approaches, digital and data-enabled accountability, and blended lifecycle financing. It argues that open defecation cannot be ended through toilet construction alone. Sustainable progress requires built-environment planning, service-chain management, behaviour change, local governance, inclusive design, climate adaptation, and continuous monitoring. The study concludes with a 2025 to 2030 implementation framework for Nigeria, with practical implications for Bauchi State and other climate-vulnerable settings.