Worldwide wastewater treatment observatory · 
Switzerland
Aguas SB Observatory · public data to understand water
WWTP ZUERICH(WERDHOELZLI)
Switzerland · official identifier CH_WWTP_026101
670,000h-e design capacity (2022) · 1st of 705
European Environment Agency — Waterbase-UWWTD, data call 2023 (versión final pública) · official identifier CH_WWTP_026101 · reported size 670,000 h-e design capacity · received load 603,034 h-e · reported treatment: PST · data year 2022. 1st of 705 records with reported size in the inventory of Switzerland; 4.0 % of the sum of those 705 records in h-e (sum of records, not national capacity); nearest inventoried plant at 6.0 km · 9 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 | 47.4008, 8.4816 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 |
FUENTES PÚBLICAS
What public sources report
Documented milestones
- 2015-12 · Zürich announced the start of construction of the Werdhölzli ozonation facility. Ayuntamiento de Zúrich
- 2018-03 · The Werdhölzli ozonation stage started operating to remove micropollutants. Ayuntamiento de Zúrich
Other published data
| Mean annual volume treated reported in the 2022 cycle | 74,521,361 m³/year (2022) · source |
|---|
Facts taken from public documents, with their date and link; an authorisation, a project or a planned capacity do not prove operation or quantities actually treated. Aguas SB editorial layer, lot L02; it does not change the official data.
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: 603,034 p.e. of reported load; equivalent average load 680,794 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 (203,222 m³/day of reference), not measured or available for reclamation.
NEARBY PLANTS
Nearby wastewater treatment plants
| Plant | Distance | Capacity (h-e) | Load 2022 | Treatment |
|---|---|---|---|---|
| Dietikon(Limmattal) | 6.0 km | 110,000 | 103,463 | primary, secondary and tertiary |
| Regensdorf(Wueeri) | 6.1 km | 30,000 | 20,911 | primary, secondary and tertiary |
| Birmensdorf | 6.2 km | 33,000 | 28,313 | primary, secondary and tertiary |
| Buchs(Furthof) | 7.1 km | 10,000 | 12,788 | primary, secondary and tertiary |
| Opfikon-Kloten | 7.1 km | 65,000 | 79,461 | 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 ZUERICH(WERDHOELZLI) report?
Reported size: 670,000 h-e design capacity. Received load: 603,034 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 ZUERICH(WERDHOELZLI)?
Aguas SB simulator reference scenario for 603,034 p.e. of reported load: 20,667,454 kWh per year (30.4 kWh per p.e. of average load), with aeration as 59 % 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.