Ivanic Grad Wastewater Treatment Plant, Ivanić-Grad, Croatia

The Ivanic Grad wastewater treatment plant is located in Ivanić-Grad, a town in Zagreb County, Croatia. The facility serves the local municipality as part of the region's wastewater infrastructure, with a designed capacity of 20,000 cubic meters per day. As a primary treatment plant, it provides basic physical treatment including sedimentation to remove settleable solids. Under Croatian regulations aligned with the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations of this scale are typically required to achieve secondary treatment, though transitional arrangements may apply. The plant's capacity suggests it serves a medium-sized agglomeration. The treated effluent is discharged into the local watershed, which ultimately drains into the Sava River basin. The Sava River flows through Croatia and into Serbia, eventually reaching the Danube River and the Black Sea. The plant plays a role in protecting downstream water quality in this important European river system.

The plant discharges into the Sava River basin, a major tributary of the Danube River. The Sava River supports diverse aquatic ecosystems and provides water for agriculture and industry. Downstream, the Danube Delta is a large wetland area of ecological significance, hosting numerous bird species and fish. Primary treatment alone may not fully remove nutrients, potentially contributing to eutrophication in sensitive downstream waters.