Municipalities in Slovakia have a duty to separate biodegradable municipal waste (BDMW) from family houses. This duty can be achieved by home composting or by collection of green waste in bio-bins, which are regularly emptied by a collection company. Collected waste is recycled in a composting plant. Our research was focused on identifying the composition of collected green waste and comparing the environmental behaviour of residents in villages and towns. The analyses made by us showed that separated BDMW from urban population has a higher rate of contamination, but a lower rate of compostable kitchen waste compared to residents in villages.