RESUMEN
BACKGROUND: People using opioids alone in private settings are at elevated risk of dying in the event of an overdose. In San Francisco, single room occupancy (SRO) tenants are 19 times more likely to die of overdose than non-SRO residents. The "SRO Project" pilot aimed to reduce fatal overdoses in SROs by recruiting and training tenants to distribute naloxone and provide overdose education in their buildings. We explore the implementation and program impacts of the SRO Project pilot in two permanent supportive housing SROs. METHODS: We conducted eight months of ethnographic fieldwork (May 2021 - Feb 2022), including 35 days observing SRO Project pilot activities, and semi-structured interviews with 11 housing staff and 8 tenant overdose prevention specialists ('specialists'). Data were analyzed using a grounded theory approach to characterize program impacts, implementation strengths, and implementation challenges from the perspective of specialists and housing staff. FINDINGS: We found that the SRO project increased awareness, access to, and understanding of naloxone; facilitated other mutual-aid practices; supported privacy and autonomy of tenants regarding their drug use; and improved rapport, communication and trust between tenants and housing staff. Strengths of the implementation process included involvement of tenants with diverse social locations and skill sets and, at one site, a team-based approach that fostered program innovation, tenant solidarity and a sense of collective ownership over the project. Program implementation was challenged by frequent turnover and capacity constraints of housing staff, particularly during overnight shifts when overdose risks were greatest. Additional challenges arose due to the psychosocial burden of overdose response work, gendered violence, issues with compensation methods, and scope creep in specialists' roles. CONCLUSION: This evaluation contributes further evidence regarding the effectiveness of tenant-led naloxone distribution and overdose education in permanent supportive and SRO housing environments. Findings indicate program implementation and sustainability can be improved by expanding tenant specialist training, compensating specialists in cash, and building stronger psychosocial support for tenants responding to overdoses in their homes.