The level of adaptability of basic administrative units in Poland (municipalities - gminy) has a huge impact on the extent of adverse consequences caused by floods, and therefore on the flood risk in municipalities. As part of the research, we selected 15 characteristics of the municipalities which shape their adaptability processes and allow a diagnosis of the municipalities’ adaptability to be made. The article aims at presenting the methodology of empirical research seeking to obtain observable data (indicators) using quantitative studies. These indicators make to possible to assess the level of the municipalities’ adaptability to flood risk. The empirical research with the use of the questionnaire produced the results which – by preparing a questionnaire –enabled us to obtain data which are unavailable to the general public, but are vital in identifying all characteristics of a municipality which impact its adaptability assessment. The questionnaire was applied in an adaptability research of 18 municipalities located in the Nysa Kłodzka basin, which are most at risk of flooding. Nevertheless, the research tool is a universal one and could be used for analysing any type of natural hazards.