WWTP Marlborough (Westerly) Sewerage Collection System and WWTP

Marlborough · official identifier CWNS2022_25000008002

4.15MGD reported design flow (2022) · 1840th of 15,772 (tied with 3 others)

EPA Clean Watersheds Needs Survey 2022 · official identifier CWNS2022_25000008002 · reported size 4.15 MGD reported design flow · reported treatment: Advanced · data year 2022. 1840th of 15,772 records with reported size in the inventory of United States (tied with 3 others); < 0.01 % of the sum of those 15,772 records in MGD (sum of records, not national capacity); nearest inventoried plant at 0.2 km · 3 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

4.15MGD reported design flow

1840th of 15,772by reported size among the 15,772 records with a size in the inventory (tied with 3 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	Advanced · reported levels
Reported coordinates	42.3368, -71.6037 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

Massachusetts: 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
Acton Sewerage Collection System and WWTF	0.2 km	0.3	Secondary
Westborough Sewerage Collection System and WWTF	6.7 km	7.89	Advanced
Hudson Sewerage Collection System and WPCF	8.4 km	3	Advanced
MWRA Clinton WWTF	12.2 km	3	Advanced
Hopkinton Sewerage Collection System and WWTF	14.4 km	0.1	Secondary

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

QUESTIONS

Frequently asked questions about this plant

What capacity does WWTP Marlborough (Westerly) Sewerage Collection System and WWTP report?

Reported size: 4.15 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.