Worldwide wastewater treatment observatory · 
United States · California
Aguas SB Observatory · public data to understand water
WWTP Santa Margarita Water District (Oso Creek WRP)
Mission Viejo · official identifier CWNS2022_06009074001
3MGD reported design flow (2022) · 2332nd of 15,772 (tied with 168 others)
EPA Clean Watersheds Needs Survey 2022 · official identifier CWNS2022_06009074001 · reported size 3 MGD reported design flow · reported treatment: Advanced · data year 2022. 2332nd of 15,772 records with reported size in the inventory of United States (tied with 168 others); < 0.01 % of the sum of those 15,772 records in MGD (sum of records, not national capacity); nearest inventoried plant at 3.3 km · 6 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 | Advanced · reported levels |
|---|---|
| Reported coordinates | 33.5967, -117.6558 precision reported by the source: 4 m what it means |
| Source and year | EPA Clean Watersheds Needs Survey 2022 · dataset record |
REGULATORY REFERENCES
Regulatory reference: United States
Regulatory framework of United States. Individual applicability is not determined in this profile.
NEARBY PLANTS
Nearby wastewater treatment plants
| Plant | Distance | MGD reported design flow | Treatment |
|---|---|---|---|
| MNWD WWTP 3A | 3.3 km | 6 | Advanced |
| El Toro Water District (Water Reclamation Plant) | 7.0 km | 6 | Advanced |
| Irvine Ranch Water District (Los Alisos WRP) | 7.2 km | 7.5 | Advanced |
| Santa Margarita Water District (Chiquita WRP) | 7.6 km | 9 | Advanced |
| South Orange County Wastewater Authority (Coastal Treatment Plant) | 7.6 km | 6.7 | Advanced |
Distances are between reported coordinates; proximity does not establish a hydraulic connection.
QUESTIONS
Frequently asked questions about this plant
What capacity does WWTP Santa Margarita Water District (Oso Creek WRP) report?
Reported size: 3 MGD reported design flow. Units are retained without conversion.
What treatment is reported?
Treatment Advanced. Nitrogen, phosphorus and UV are shown only when explicitly reported.
SOURCE AND CORRECTIONS
Source
reported data · EPA Clean Watersheds Needs Survey 2022 · data 2022 · edition 2022 · source licence: Public domain (EPA geospatial default; see LICENCIA.txt) · JSON for this plant · suggest a correction · catalogue 2026-11-06. Reported data, not a current inspection; no compliance judgements.