Viesites pilsetas PU - Closed Secondary Wastewater Treatment Plant in Viesītes pagasts, Latvia

Viesites pilsetas PU is a municipal wastewater treatment plant located in Viesītes pagasts, Jēkabpils novads, Latvia. The plant served a small population of 479 people and operated with secondary treatment before its closure. As a small agglomeration in Latvia, it was subject to national regulations aligned with the EU Urban Waste Water Treatment Directive, which requires secondary treatment for inland freshwater discharges from agglomerations of this size. The plant had a designed capacity of 1,000 m³/day and a reported discharge volume of 91.42 m³/day. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant's operational status is closed, indicating it is no longer in service. The treated effluent was discharged into local surface waters, likely a small river or stream within the Daugava River basin, which ultimately flows into the Baltic Sea. The surrounding area is rural and agricultural, and the plant's discharge would have contributed to maintaining water quality in the local watershed.

The plant discharged into a local watercourse within the Daugava River basin, which drains into the Baltic Sea. The Baltic Sea is a brackish inland sea with limited water exchange, making it sensitive to nutrient pollution. Secondary treatment reduces organic load but may not fully remove nutrients, so the plant's discharge could have contributed to eutrophication risks in downstream waters. The surrounding area is predominantly agricultural, with potential diffuse pollution sources.