*2.1. Location*

The town of Virovitica is located in a lowland area, surrounded by Bilogora, wide open to the north and the Drava valley and is the center of the Virovitica Podravina County. The city area consists of two relief units: the Bilogora part in the south with a pronounced step-type relief where the altitude reaches up to 250 m and the plain part in the north which is no higher than 115 m above sea level and represents a typical plain region. The drainage system of Virovitica was built as a mixed sewage system into which rainwater and wastewater are discharged. In the county, 70% of inhabitants are supplied from organized water supply systems, while the average supply in the Republic of Croatia is around 65% [3]. On the water supply network of the city of Virovitica and its surroundings, sampling of drinking water was carried out at 10 different locations (1 public water supply and 9 local water supply systems).
