Worldwide wastewater treatment observatory · 
Austria
Aguas SB Observatory · public data to understand water
WWTP ARA Karlstein
Austria · official identifier ATTP_3-749
2,700h-e design capacity (2022) · 544th of 634 (tied with 3 others)
European Environment Agency — Waterbase-UWWTD, data call 2023 (versión final pública) · official identifier ATTP_3-749 · reported size 2,700 h-e design capacity · received load 913 h-e · reported treatment: PST · data year 2022. 544th of 634 records with reported size in the inventory of Austria (tied with 3 others); 0.01 % of the sum of those 634 records in h-e (sum of records, not national capacity); nearest inventoried plant at 7.4 km · 3 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 | yes |
| Phosphorus removal | yes |
| UV disinfection | not reported |
| Status | active |
| Reported coordinates | 48.8782, 15.4158 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: Austria
Regulatory framework of Austria · Directive (EU) 2024/3019: reported-capacity band 1,000 to 9,999 p.e.; obligations are set by agglomeration load, not by the capacity of this plant. Individual applicability is not determined in this profile.
SCENARIO
Reference energy scenario for this load estimate · simulator engine
what this estimate is · Inputs: 913 p.e. of reported load; equivalent average load 909 p.e. with the reference profile of Austria (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 (183 m³/day of reference), not measured or available for reclamation.
NEARBY PLANTS
Nearby wastewater treatment plants
| Plant | Distance | Capacity (h-e) | Load 2022 | Treatment |
|---|---|---|---|---|
| Ara Raabs An Der Thaya | 7.4 km | 2,900 | 1,907 | primary, secondary and tertiary |
| Ara Groß-Siegharts | 8.8 km | 7,500 | 6,888 | primary, secondary and tertiary |
| Ara Thaya | 9.4 km | 2,000 | 1,067 | primary, secondary and tertiary |
| Ara Abwasserreinigung Im Waldviertel Gmbh | 10.9 km | 16,000 | 6,929 | primary, secondary and tertiary |
| Ara Windigsteig | 15.6 km | 1,500 | 1,062 | 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 ARA Karlstein report?
Reported size: 2,700 h-e design capacity. Received load: 913 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 ARA Karlstein?
Aguas SB simulator reference scenario for 913 p.e. of reported load: 46,769 kWh per year (51.5 kWh per p.e. of average load), with aeration as 63 % 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.