In 2023, the population connected to sewerage with secondary treatment in Japan stood at 44.96%. Forecasted data shows a gradual decline from 44.45% in 2024 to 42.47% by 2028. Year-on-year, this represents decreases of approximately 1.15% from 2024 to 2025, 1.14% from 2025 to 2026, 1.13% from 2026 to 2027, and 1.12% from 2027 to 2028. Over the last five years, the CAGR indicates an average annual decrease of around 1.24%.
Future trends to watch for include potential technological advancements in wastewater treatment, government policies aimed at improving sewerage infrastructure, and demographic shifts such as urban population changes that could influence the connected population. Monitoring these factors will be crucial to understanding and potentially reversing the declining trend.
