Keila Joa kool Wastewater Treatment Plant, Keila-Joa alevik, Estonia

Keila Joa kool is a wastewater treatment plant located in Keila-Joa alevik, Harju County, Estonia. The facility served a small population of 4 people and is now closed. It is situated near the Baltic Sea coast, within 10 km of the shoreline. The plant provided secondary treatment, which is the standard level required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for smaller agglomerations. Although the plant is closed, its designed capacity of 300 m³/day indicates it was built to handle a larger load than its actual service population. Treated wastewater from the plant likely discharged into local streams or groundwater that eventually reach the Baltic Sea. The coastal location means that any discharge could affect the sensitive marine environment of the Gulf of Finland, which supports diverse aquatic life and is an important area for migratory fish and seabirds.

The plant is located in the coastal region of Harju County, Estonia, within 10 km of the Baltic Sea. The receiving water body is likely a small stream or groundwater that drains into the Gulf of Finland, a brackish sea area with sensitive ecosystems. The Baltic Sea is a semi-enclosed basin with limited water exchange, making it vulnerable to nutrient pollution. The plant's discharge, even at small volumes, could contribute to local eutrophication risks in coastal waters.