**4. Conclusions**

Water quality indicators are determined by different methods, and the determination of indicators is of significant importance for the prevention of water pollution that is used for water supply, agriculture, industrial processes, and leisure. The analyzed samples of water for human consumption of the water supply system of Virovitica and its surroundings, based on microbiological, physical and chemical indicators of the quality of drinking water, comply with the ordinance on conformity parameters, methods of analysis, monitoring and safety plans for water for human consumption and the way of keeping a register of legal entities that perform the activity of public water supply. According to estimates by the World Health Organization, approximately 1.2 billion people fall ill due to contaminated water. Today, according to estimates by the international organization of the United Nations, 1.5 billion people do not have safe drinking water, and in the next 25 years that number will grow to about 4.5 billion. Water is not a commercial product, but a heritage; therefore, it is necessary to make individuals aware of controlled waste disposal, rational water consumption, wastewater treatment, controlled application of agrotechnical substances (pesticides), monitoring the transport of dangerous substances and, ultimately, water conservation and protection.

**Author Contributions:** Conceptualization, A.P.S. and K.O.; methodology, A.P.S. and K.O.; validation, A.P.S. and K.O.; formal analysis, A.P.S. and K.O.; investigation, A.P.S. and K.O.; resources A.P.S. and K.O.; data curation, A.P.S. and K.O.; writing—original draft preparation, A.P.S., K.O., L.P. and D.D.; writing—review and editing, A.P.S. and L.P. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Acknowledgments:** Virkom d.o.o., Virovitica, Croatia.

**Conflicts of Interest:** The authors declare no conflict of interest.
