Worldwide wastewater treatment observatory · 
Switzerland
Aguas SB Observatory · public data to understand water
WWTP Arosa (Langwies)
Switzerland · official identifier CH_WWTP_392105
1,250h-e design capacity (2022) · 504th of 705 (tied with 4 others)
European Environment Agency — Waterbase-UWWTD, data call 2023 (versión final pública) · official identifier CH_WWTP_392105 · reported size 1,250 h-e design capacity · received load 293 h-e · reported treatment: PST · data year 2022. 504th of 705 records with reported size in the inventory of Switzerland (tied with 4 others); < 0.01 % of the sum of those 705 records in h-e (sum of records, not national capacity); nearest inventoried plant at 4.0 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 | yes |
| UV disinfection | not reported |
| Status | active |
| Reported coordinates | 46.8199, 9.7038 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: 293 p.e. of reported load; equivalent average load 332 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 (99 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) | 4.0 km | 2,000 | 516 | primary, secondary and tertiary |
| Arosa | 5.3 km | 32,500 | 9,334 | primary, secondary and tertiary |
| Arosa (Lüen) | 7.6 km | 437 | 181 | primary, secondary and tertiary |
| Davos (Gadenstatt) | 9.5 km | 44,000 | 20,169 | primary, secondary and tertiary |
| Davos (Glaris) | 10.5 km | 1,500 | 626 | 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 (Langwies) report?
Reported size: 1,250 h-e design capacity. Received load: 293 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 (Langwies)?
Aguas SB simulator reference scenario for 293 p.e. of reported load: 23,586 kWh per year (71.1 kWh per p.e. of average load), with aeration as 50 % 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.