Defining Economic and Environmental Typologies across 77 Countries to Prioritize Opportunities for Nonsewered Sanitation

. Low-cost, low-CI typologies are predominantly in countries with lower human development indices (HDI 2-4), demonstrating alignment between the sanitation need and the NSS opportunity space. Ultimately, the intent of this work is not to imply one-size-fits-all solutions for individual countries; by elucidating key sustainability drivers and defining typologies, this work can support early-stage decision-making for NSS technology research, development, and deployment.