Worldwide wastewater treatment observatory · 
Spain · País Vasco
Aguas SB Observatory · public data to understand water
WWTP Ondarroa
Ondarroa · official identifier ES16480730001010E
76,960h-e design capacity (2022) · 257th of 2,166
European Environment Agency — Waterbase-UWWTD, data call 2023 (versión final pública) · official identifier ES16480730001010E · reported size 76,960 h-e design capacity · received load 19,514 h-e · reported treatment: PST · data year 2022. 257th of 2,166 records with reported size in the inventory of Spain; 0.08 % of the sum of those 2,166 records in h-e (sum of records, not national capacity); nearest inventoried plant at 4.8 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 | not reported |
| UV disinfection | yes |
| Status | active |
| Reported coordinates | 43.3310, -2.4290 reported precision: approximate (~111 m) what it means |
| Source and year | European Environment Agency — Waterbase-UWWTD, data call 2023 (versión final pública) · dataset record |
REGULATORY REFERENCES
Referencia normativa: Spain
Regulatory framework of Spain · Directive (EU) 2024/3019: reported-capacity band 10,000 to 149,999 p.e.; obligations are set by agglomeration load, not by the capacity of this plant. Individual applicability is not determined in this profile.
NEARBY PLANTS
Nearby wastewater treatment plants
| Plant | Distance | Capacity (h-e) | Load 2022 | Treatment |
|---|---|---|---|---|
| Zabalera | 4.8 km | 14,000 | 6,962 | primary, secondary and tertiary |
| Lekeitio | 6.5 km | 32,000 | 20,854 | primary, secondary and tertiary |
| Markina | 8.1 km | 10,500 | 6,789 | primary, secondary and tertiary |
| Arronamendi | 8.4 km | 12,300 | 7,000 | primary and secondary |
| Apraitz | 11.7 km | 90,027 | 80,250 | 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 Ondarroa report?
Reported size: 76,960 h-e design capacity. Received load: 19,514 h-e. Units are retained without conversion.
What treatment is reported?
Treatment PST. Nitrogen, phosphorus and UV are shown only when explicitly reported.
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.