Worldwide wastewater treatment observatory · 
Portugal
Aguas SB Observatory · public data to understand water
WWTP Chelas
Portugal · official identifier PT7032798
255,000h-e design capacity (2022) · 14th of 527
European Environment Agency — Waterbase-UWWTD, data call 2023 (versión final pública) · official identifier PT7032798 · reported size 255,000 h-e design capacity · received load 150,000 h-e · reported treatment: PST · data year 2022. 14th of 527 records with reported size in the inventory of Portugal; 1.5 % of the sum of those 527 records in h-e (sum of records, not national capacity); nearest inventoried plant at 5.0 km · 7 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 | yes |
| Status | active |
| Reported coordinates | 38.7325, -9.1187 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: Portugal
Regulatory framework of Portugal · Directive (EU) 2024/3019: reported-capacity band 150,000 p.e. or more; 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: 150,000 p.e. of reported load; equivalent average load 150,000 p.e. with the reference profile of Portugal (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 (30,000 m³/day of reference), not measured or available for reclamation.
NEARBY PLANTS
Nearby wastewater treatment plants
| Plant | Distance | Capacity (h-e) | Load 2022 | Treatment |
|---|---|---|---|---|
| Alcantara | 5.0 km | 756,000 | 661,500 | primary, secondary and tertiary |
| Beirolas | 6.5 km | 213,500 | 213,500 | primary, secondary and tertiary |
| Mutela | 7.3 km | 186,970 | 147,900 | primary, secondary and tertiary |
| Valdeao | 8.3 km | 7,945 | 6,800 | primary, secondary and tertiary |
| Barreiro/Moita | 8.9 km | 294,650 | 170,000 | 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 Chelas report?
Reported size: 255,000 h-e design capacity. Received load: 150,000 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 Chelas?
Aguas SB simulator reference scenario for 150,000 p.e. of reported load: 4,718,487 kWh per year (31.5 kWh per p.e. of average load), with aeration as 58 % 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.