WWTP Stillman Valley STP & Coll. System

Stillman Valley · official identifier CWNS2022_17001415001

0.2MGD reported design flow (2022) · 8686th of 15,772 (tied with 355 others)

EPA Clean Watersheds Needs Survey 2022 · official identifier CWNS2022_17001415001 · reported size 0.2 MGD reported design flow · reported treatment: Secondary · data year 2022. 8686th of 15,772 records with reported size in the inventory of United States (tied with 355 others); < 0.01 % of the sum of those 15,772 records in MGD (sum of records, not national capacity); nearest inventoried plant at 6.0 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

0.2MGD reported design flow

8686th of 15,772by reported size among the 15,772 records with a size in the inventory (tied with 355 others) · < 0.01 % of the sum of those records (sum of records, not national capacity) · the largest plants in the country · how it is calculated

Treatment	Secondary · reported levels
Reported coordinates	42.1092, -89.1689 precision reported by the source: 4 m what it means
Source and year	EPA Clean Watersheds Needs Survey 2022 · dataset record

REGULATORY REFERENCES

Referencia normativa: United States

Regulatory framework of United States. Individual applicability is not determined in this profile.

LOCATION

Illinois: this plant on the map

this plant on the map · regional directory.

NEARBY PLANTS

Nearby wastewater treatment plants

Plant	Distance	MGD reported design flow	Treatment
Davis Junction WWTP	6.0 km	0.6	Advanced
BYRON STP	6.8 km	0.57	Advanced
Four Rivers Sanitation Authority	14.0 km	40	Advanced
OREGON STP · Oregon · CWNS2022_17001418001	17.5 km	0.63	Secondary
DURAND STP	18.9 km	0.35	Secondary

Distances are between reported coordinates; proximity does not establish a hydraulic connection.

QUESTIONS

Frequently asked questions about this plant

What capacity does WWTP Stillman Valley STP & Coll. System report?

Reported size: 0.2 MGD reported design flow. Units are retained without conversion.

What treatment is reported?

Treatment Secondary. 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.