A new civil protection law was adopted in Latvia in 2016, which provides for a framework based on disaster risk assessment. In August 2020, a civil protection plan for the State of Latvia has been developed, which determines the competence of disaster management entities and action in the implementation of disaster management measures - prevention, preparedness, response and mitigation measures. Local governments shall, in accordance with the Civil Protection and Disaster Management Law, develop a civil protection plan for the co-operation area, which combines several local government territories together, thereby reducing the number of civil protection commissions in Latvia, as well as increasing the liability area of one commission. A civil protection plan shall be developed in each area of local government cooperation where information on risk assessment, including risk scenarios, risk matrices and risk cards, is included in one of the sections. There is currently no formally adopted methodology in Latvia to assess the risk of disaster management, but the material issued by State Fire and Rescue Service, which refers to the risk assessment, is based on qualitative risk assessment and the use of a risk matrix that is practically useless for disaster risk assessment. The study was carried out in order to look at the possibilities of using the fault tree within the framework of the Riga City civil protection plan, creating the event risk scenarios for disaster risk assessment and assessing possible causes for the following disasters: collapse of buildings and structures, accident in the heating, water supply, waste water or sewage system. The civil protection commissions of the local government cooperation area are responsible for the management of these disasters in Latvia, so this risk assessment approach may be appropriate in the development of civil protection plans for the co-operation area, so it is very important that the risk assessment be professional and comprehensive. As part of the article, possible risk scenarios have been analysed and the risk scenario drawing up algorithm is proposed to draw up a civil protection plan for the Riga cooperation area.