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Keila Joa kool is a closed secondary treatment plant in Keila-Joa alevik, Estonia, serving a population of 4. It discharged 0.92 m³/day with a designed capacity of 300 m³/day.
Sonajala wastewater treatment plant in Hiiu maakond, Estonia, is a closed secondary treatment facility with a designed capacity of 72.00 m³/day, located within 10 km of the coast.