Background In Kenya, Community Health Committees (CHC) were established to enhance community participation in health services. Their role is to provide leadership, oversight in delivery of community health services, promote social accountability and mobilize resources for community health. CHCs form social networks with other actors, with whom they exchange health information for decision-making and accountability. This case study aimed to explore the structure of a rural and an urban CHC network and to analyze how health-related information flowed in these networks. Understanding the pathways of information in community settings may provide recommendations for strategies to improve the role and functioning of CHCs. Methods In 2017, we conducted 4 focus group discussions with 27 community discussants and 10 semi-structured interviews with health professionals in a rural area and an urban slum. Using social network analysis, we determined the structure of their social networks and how health related information flowed in these networks. Results Both CHCs were composed of respected persons nominated by their communities. Each social network had 12 actors that represented both community and government institutions. CHCs were not central actors in the exchange of health-related information. Health workers, community health volunteers and local Chiefs in the urban slum often passed information between the different groups of actors, while CHCs hardly did this. Therefore, CHCs had little control over the flow of health-related information. Although CHC members were respected persons who served in multiple roles within their communities, this did not enhance their centrality. It emerged that CHCs were often left out in the flow of health-related information and decision-making, which led to demotivation. Community health volunteers were more involved by other actors such as health managers and non-governmental organizations as a conduit for health-related information. Conclusion Social network analysis demonstrated how CHCs played a peripheral role in the flow of health-related information. Their perception of being left out of the information flow led to demotivation, which hampered their ability to facilitate community participation in community health services; hence challenging effective participation through CHCs.