Norway chemical, biological or combined treatment among 2,743 municipal plants; percent, 2024.
Norway’s municipal wastewater plants are grouped into six treatment categories for 2024. Chemical, biological and combined chemical-biological plants numbered 773 out of 2,743. Their combined share was 28.2%. Mechanical treatment was the largest single category at 53.5%, while direct discharges accounted for 11.3%.
| Rank | Entry | Value | Period |
|---|---|---|---|
| 1 | Direct discharges | 309 | 2024 |
| 2 | Mechanical | 1,468 | 2024 |
| 3 | Chemical | 210 | 2024 |
| 4 | Biological | 90 | 2024 |
| 5 | Chemical + biological | 473 | 2024 |
| 6 | Other treatment | 193 | 2024 |
Source 1: Municipal wastewater - treatment plants, by region, treatment method, contents and year
Publisher: Statistics Norway
Dataset/table: Statistics Norway Statbank
Units: percent of plants
Date checked: 2026-07-15
Evidence: Supplies the official values used to calculate share of municipal wastewater plants using chemical, biological or combined chemical-biological treatment for 2024.
The combined share groups three treatment categories and does not imply identical performance across those methods.
Chemical, biological and combined chemical-biological plant counts are added and divided by the total across all six categories.
All plant counts use the same 2024 Statistics Norway classification and establishment-count basis.
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