Introduction: Reports of the National Laboratory of Health, Environment and Food on drinking water from the water supply in the private management in the municipality of Mirna in the 2011-2015 period show a constant breach of maximum levels of microbiological indicators. Purpose: The purpose of this paper is to assess the situation of water supply in the municipality of Mirna in terms the health of drinking water, to determine whether the water supply in the municipality of Mirna complies with legal requirements in the field of drinking water, and if the form of governance affects the health suitability and compliance of drinking water. Methods: We used a descriptive method for checking the condition of water supply in Slovenia and abroad and compared public water supply and private water supply. As part of the research, we formed an assesssment structure for the conformity of water supply systems in the municipality of Mirna, based on hygienic-technical criteria, which are statutory. Based on the set structures, we analyzed five water supply systems that supply to more than 50 persons or provide more than 10 m3 of drinking water per day. For each water supply system, we made an assessment of compliance with the recommendations. Results: The results showed that all operators provide consistent and wholesome drinking water and meet all the legal requirements for drinking water. Inconsistencies were found both in private and public water supply systems works, and they were in each waterworks found no more than three non - compliance of the 25 rated hygienic and technical criteria. In all water supply systems we found the same inconsistency, that refers to the improper discharge of wastewater from the drinking water supply systems facilities to the environment. Inconsistencies in the field of personnel, remedial measures and internal controls were not found in the survey. Discussion and conclusion: The operators comply with legal requirements in the field of drinking water and provide the user with consistent and wholesome drinking water. For a more comprehensive assessment of compliance and a safety analysis of water supply an appropriate methodology should be developed.