Marjamaa RA002 Wastewater Treatment Plant, Märjamaa, Estonia

Marjamaa RA002 is an advanced wastewater treatment facility located in Märjamaa, Rapla County, Estonia. The plant serves a population of 2,721, classifying it as a small agglomeration under Estonian and EU regulations. It is situated inland, away from coastal areas, and treats municipal wastewater from the local community. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 4,070 m³/day and an actual discharge volume of 626.91 m³/day, the plant operates well below its capacity, indicating room for future growth or efficient water management. The treated effluent is discharged into local water bodies that ultimately drain into the Baltic Sea via the Kasari River and Matsalu Bay. The plant's advanced treatment helps protect the sensitive downstream ecosystems, including the Matsalu National Park, a key wetland and bird habitat. By reducing nutrient loads, the plant contributes to the health of the Baltic Sea, which faces eutrophication challenges.

The plant discharges into local streams that flow into the Kasari River, which empties into Matsalu Bay, part of the Baltic Sea. This region is ecologically sensitive, supporting diverse aquatic life and serving as an important migratory corridor for birds. Advanced treatment at the plant helps minimize nutrient pollution, reducing the risk of eutrophication in downstream waters.