Worldwide wastewater treatment observatory · 
Spain · País Vasco
Aguas SB Observatory · public data to understand water
WWTP Oion
Oyón-Oion · official identifier ES16010430003010E
8,517h-e design capacity (2022) · 1095th of 2,166
European Environment Agency — Waterbase-UWWTD, data call 2023 (versión final pública) · official identifier ES16010430003010E · reported size 8,517 h-e design capacity · received load 5,322 h-e · reported treatment: PS · data year 2022. 1095th of 2,166 records with reported size in the inventory of Spain; < 0.01 % of the sum of those 2,166 records in h-e (sum of records, not national capacity); nearest inventoried plant at 3.5 km · 2 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 (as reported to the EEA: PS) · reported levels |
|---|---|
| Nitrogen removal | not reported |
| Phosphorus removal | not reported |
| UV disinfection | not reported |
| Status | active |
| Reported coordinates | 42.4920, -2.4400 reported precision: indicative (>1 km) 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 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.
NEARBY PLANTS
Nearby wastewater treatment plants
| Plant | Distance | Capacity (h-e) | Load 2022 | Treatment |
|---|---|---|---|---|
| Logroño | 3.5 km | 467,000 | 193,263 | primary, secondary and tertiary |
| Viana | 5.7 km | 15,350 | 5,256 | primary and secondary |
| Fuenmayor | 10.0 km | 18,660 | 6,553 | primary and secondary |
| Elvillar-Lanciego | 10.0 km | 6,375 | 4,044 | primary and secondary |
| Murillo de Río Leza | 13.3 km | 3,255 | 2,077 | primary and secondary |
Distances are between reported coordinates; proximity does not establish a hydraulic connection.
QUESTIONS
Frequently asked questions about this plant
What capacity does WWTP Oion report?
Reported size: 8,517 h-e design capacity. Received load: 5,322 h-e. Units are retained without conversion.
What treatment is reported?
Treatment PS. 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.