The Sustainable Development Goals concept advocates affordable, safe and clean water supply. The water shortage in Dar es Salaam city affects communities in different wards of Kinondoni municipality. As a strategy to improve water access, this study assessed opportunities for application of rainwater harvesting (RWH) technologies, communities’ knowledge of this and their willingness to adopt RWH technologies, and challenges for installation and maintenance of RWH technologies in areas of Makongo, Mbezi, Msasani and Kimara wards of Kinondoni municipality. Data collection involved interviews, questionnaires and observation while the SPSS tool was used for data analysis. Also, laboratory tests for water quality parameters were conducted. Results showed that rooftop RWH systems with proper components and proper maintenance were found to provide better quality water for domestic use than other sources. Laboratory tests revealed that rainwater was better than other water sources. Lack of knowledge was the main factor that hindered adoption of RWH technology. Also, initial investment cost was among the reasons deterring its adoption. Therefore, to improve the adoption rate of RWH technologies there should be an integrated participation of different stakeholders to educate and support communities to address RWH technologies’ challenges. This can be supported by a proposed institutional framework.