Worldwide wastewater treatment observatory · 
Switzerland
Aguas SB Observatory · public data to understand water
WWTP Arosa (Lüen)
Switzerland · official identifier CH_WWTP_392104
437h-e design capacity (2022) · 637th of 705 (tied with 2 others)
European Environment Agency — Waterbase-UWWTD, data call 2023 (versión final pública) · official identifier CH_WWTP_392104 · reported size 437 h-e design capacity · received load 181 h-e · reported treatment: PST · data year 2022. 637th of 705 records with reported size in the inventory of Switzerland (tied with 2 others); < 0.01 % of the sum of those 705 records in h-e (sum of records, not national capacity); nearest inventoried plant at 3.6 km · 4 within 10 km. Reported data with their source; estimates are not measurements of the plant.
Aguas SB does not manage this wastewater treatment plant.
WHAT THE DATA REPORT
Reported data official data · 2022
| Treatment | primary + secondary + tertiary (more stringent) (as reported to the EEA: PST) · reported levels |
|---|---|
| Nitrogen removal | not reported |
| Phosphorus removal | not reported |
| UV disinfection | not reported |
| Status | active |
| Reported coordinates | 46.8319, 9.6054 precision reported by the source: level 2 what it means |
| Source and year | European Environment Agency — Waterbase-UWWTD, data call 2023 (versión final pública) · dataset record |
REGULATORY REFERENCES
Referencia normativa: Switzerland
Regulatory framework of Switzerland. Individual applicability is not determined in this profile.
SCENARIO
Reference energy scenario for this load estimate · simulator engine
what this estimate is · Inputs: 181 p.e. of reported load; equivalent average load 204 p.e. with the reference profile of Switzerland (hypothesis with reported load and reference profile; not a measurement). Open this scenario in the simulator · how it is calculated and what it is not.
Reference scenario computed on the server from the reported load and the country profile; an estimate, not a measurement. The simulator recomputes it when opened.
WATER THAT COULD RETURN
Reuse potential
what this estimate is · Volume estimated from the reported load (61 m³/day of reference), not measured or available for reclamation.
NEARBY PLANTS
Nearby wastewater treatment plants
| Plant | Distance | Capacity (h-e) | Load 2022 | Treatment |
|---|---|---|---|---|
| Arosa (Molinis) | 3.6 km | 2,000 | 516 | primary, secondary and tertiary |
| Chur | 7.2 km | 133,333 | 67,699 | primary, secondary and tertiary |
| Arosa (Langwies) | 7.6 km | 1,250 | 293 | primary, secondary and tertiary |
| Arosa | 8.7 km | 32,500 | 9,334 | primary, secondary and tertiary |
| Domat/Ems (Tuma Lunga) | 13.0 km | 60,000 | 38,766 | primary, secondary and tertiary |
Distances are between reported coordinates; proximity does not establish a hydraulic connection.
QUESTIONS
Frequently asked questions about this plant
What capacity does WWTP Arosa (Lüen) report?
Reported size: 437 h-e design capacity. Received load: 181 h-e. Units are retained without conversion.
What treatment is reported?
Treatment PST. Nitrogen, phosphorus and UV are shown only when explicitly reported.
How much energy would a reference plant use with the load of Arosa (Lüen)?
Aguas SB simulator reference scenario for 181 p.e. of reported load: 18,432 kWh per year (90.2 kWh per p.e. of average load), with aeration as 47 % of consumption. Estimate with the country reference profile; not a measurement of the plant.
SOURCE AND CORRECTIONS
Source
reported data · European Environment Agency — Waterbase-UWWTD, data call 2023 (versión final pública) · data 2022 · edition 2023 · source licence: CC BY 4.0 · JSON for this plant · suggest a correction · catalogue 2026-11-06. Reported data, not a current inspection; no compliance judgements.