In 2023, Germany's population connected to urban and other secondary wastewater treatment plants was about 1.1 million units. From 2024, a declining trend is forecasted. The year-on-year decrease starts at 8.1% in 2025, then 8.8% in 2026, followed by 9.4% in 2027, and 10.2% in 2028. This results in a compound annual growth rate (CAGR) of approximately -8.61% over the five-year period.

Future trends to watch for:

Potential improvement in wastewater treatment technologies.
Government policies impacting infrastructure upgrades.
Population dynamics and urbanization rates affecting wastewater connection needs.