Public services are an important segment of public administration, with the aim of meeting the general and public needs of citizens. With the development of these services, the organizational forms of service provision have evolved, so today we are witnessing the cooperation of the private and public sectors. Although the public authority retains responsibility for the performance of public services, it decides which services will be provided, how they will be financed and in what manner they will be performed. Through a concession contract, a private entity can take over the performance of a specific public service for a limited time. Communal activities are a special category of public services because they meet the local needs of citizens through territorial self-government. In Croatia, communal services include infrastructural activities that ensure the construction and maintenance of communal infrastructure and service activities for everyday life and work. Each unit of local self-government determines the way of performing communal activities. The City of Zagreb uses various models, including trading companies, concession contracts and outsourcing, often in cooperation with the private sector. Zagrebački holding d.o.o., a trading company owned by the City of Zagreb, plays a key role in the provision of most communal services. The City also relies on the work of the City Office for project implementation and oversight. As the largest city in Croatia, Zagreb has the financial capacity to choose different models of performing communal activities. The legal framework enables each local self-government unit to choose the model that best suits its specific needs and ensures optimal services for residents.