VARZO Wastewater Treatment Plant, Varzo, Piemonte, Italy

The VARZO wastewater treatment plant is located in Varzo, a town in the Piemonte region of northern Italy. It serves a population of approximately 2,935 residents, making it a small-scale municipal facility. The plant is situated near the Toce River, which flows through the Ossola valley and eventually joins the Po River, Italy's longest river. As a secondary treatment plant, VARZO meets the standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The directive mandates secondary treatment for all discharges from agglomerations with a population equivalent (PE) between 2,000 and 10,000. The plant's designed capacity of 3,000 m³/day aligns with the expected load from its service area. The treated effluent is discharged into the local water system, which drains into the Toce River and then into Lake Maggiore, a major subalpine lake. Lake Maggiore is an ecologically sensitive water body that supports diverse aquatic life and is an important resource for recreation and tourism. The plant's secondary treatment helps protect downstream water quality in this valuable watershed.

The VARZO plant discharges into the Toce River, a tributary of Lake Maggiore, which is part of the Po River basin. Lake Maggiore is a large subalpine lake that supports diverse aquatic ecosystems and is a key water resource for the region. The plant's secondary treatment helps reduce nutrient and organic pollutant loads, protecting the lake from eutrophication and maintaining water quality for downstream communities and habitats.