A survey of illegal landfills conducted in the Municipality of Odžak in the Posavina County of Bosnia and Herzegovina recorded a total of 13 locations, of which the area and volume of waste present were estimated at 11 locations, as well as its structure according to categories of the origin. Wild dumps Balegovac and Nova lađa could not be explored by the same objective methods, first due to its inadequate remediation by burying previously disposed amounts of waste immediately before this survey, and second due to its instability in the inundation of the Sava River depending on the water level of the river. The research established that the largest landfill in terms of the amount of waste is in the area of Bukovica, and the second largest in Novi Grad, which also contains the largest share of hazardous waste. These two sites, along with the inadequately rehabilitated Balegovac site with significant amounts of waste of unknown structure, should be a priority for remediation. All other locations of illegal landfills in the municipality are much smaller for now, and their existence in such numbers reflects the worrying situation with waste in the municipality of Odžak. In the future solution of this problem, which is accompanied by a similar situation at the county and state level, the remediation of illegal landfills will be an important item, for which the first step is this master thesis.