Worldwide wastewater treatment observatory · 
Germany
Aguas SB Observatory · public data to understand water
WWTP Mainz
Germany · official identifier DETP_RP102380095
400,000h-e design capacity (2022) · 43rd of 3,798 (tied with 5 others)
European Environment Agency — Waterbase-UWWTD, data call 2023 (versión final pública) · official identifier DETP_RP102380095 · reported size 400,000 h-e design capacity · received load 300,200 h-e · reported treatment: PST · data year 2022. 43rd of 3,798 records with reported size in the inventory of Germany (tied with 5 others); 0.27 % of the sum of those 3,798 records in h-e (sum of records, not national capacity); nearest inventoried plant at 1.4 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 | yes |
| Phosphorus removal | yes |
| UV disinfection | not reported |
| Status | active |
| Reported coordinates | 50.0308, 8.2170 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
- 2026-03-18 · In March 2026, a municipal draft proposed studying the feasibility of heat recovery from the effluent at the Mainz-Mombach plant. City of Mainz
Other published data
| Mean annual volume treated reported in the 2022 cycle | 18,511,496 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 L04; it does not change the official data.
REGULATORY REFERENCES
Referencia normativa: Germany
Regulatory framework of Germany · 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: 300,200 p.e. of reported load; equivalent average load 300,439 p.e. with the reference profile of Germany (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 (64,843 m³/day of reference), not measured or available for reclamation.
NEARBY PLANTS
Nearby wastewater treatment plants
| Plant | Distance | Capacity (h-e) | Load 2022 | Treatment |
|---|---|---|---|---|
| Wiesbaden / Biebrich | 1.4 km | 130,000 | 130,000 | primary, secondary and tertiary |
| Wiesbaden / Mitte | 3.8 km | 330,000 | 239,890 | primary, secondary and tertiary |
| Ginsheim-Gustavsburg | 9.8 km | 32,500 | 32,500 | primary, secondary and tertiary |
| Eltville Am Rhein / Erbach (Rheingau) | 9.9 km | 65,800 | 65,800 | primary, secondary and tertiary |
| Hochheim Am Main / Hochheim | 10.4 km | 35,000 | 35,000 | 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 Mainz report?
Reported size: 400,000 h-e design capacity. Received load: 300,200 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 Mainz?
Aguas SB simulator reference scenario for 300,200 p.e. of reported load: 8,878,790 kWh per year (29.6 kWh per p.e. of average load), with aeration as 60 % 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.