In recent decades, the consumption of water by industry, commerce and households has steadily increased. This has also led to a constant increase in the amount of various pollutants in waste water. The result is a considerable pollution of water bodies. For this reason, the waste water is collected in sewer networks and fed to the treatment plants via the main collector.
ARA Pustertal AG operates five wastewater treatment plants (ARA) and the associated main collector with a length of 132 km in the optimal catchment area 4 (OEG 4), with a catchment area of 2.168 km².
On average, the five wastewater treatment plants treat around 12.4 million cubic metres of wastewater annually.