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Hofsteig wastewater treatment plant serves Hard, Vorarlberg, Austria, with a population equivalent of 132,743. The plant operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.
Hohenems wastewater treatment plant serves the city of Hohenems in Vorarlberg, Austria. It treats wastewater for a population of over 121,000 and discharges into the Rhine River basin.