WWTP MWRA Deer Island WWTF

Boston · official identifier CWNS2022_25000128001

310MGD reported design flow (2022) · 12th of 15,772 (tied with 1 others)

EPA Clean Watersheds Needs Survey 2022 · official identifier CWNS2022_25000128001 · reported size 310 MGD reported design flow · reported treatment: Secondary · data year 2022. 12th of 15,772 records with reported size in the inventory of United States (tied with 1 others); 0.62 % of the sum of those 15,772 records in MGD (sum of records, not national capacity); nearest inventoried plant at 6.8 km · 1 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

310MGD reported design flow

12th of 15,772by reported size among the 15,772 records with a size in the inventory (tied with 1 others) · 0.62 % 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	42.3505, -70.9569 precision reported by the source: 4 m what it means
Source and year	EPA Clean Watersheds Needs Survey 2022 · dataset record

FUENTES PÚBLICAS

What public sources report

Population of the served area (Instalación CWNS 25000128001): 2,317,098 inhabitants (2022, U.S. Environmental Protection Agency (EPA)).

Documented milestones

1995 · The first upgraded primary treatment units at Deer Island began operating. Agencia de Protección Ambiental de EE. UU.
1997 · The first of three secondary treatment batteries at Deer Island started up. Agencia de Protección Ambiental de EE. UU.

Facts taken from public documents, with their date and link; an authorisation, a project or a planned capacity do not prove operation or quantities actually treated. Aguas SB editorial layer, lot L02; it does not change the official data.

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
Hull Sewerage Collection System and WPCF	6.8 km	3.07	Secondary
Lynn Sewerage Collection System and WPCF	11.5 km	25.8	Secondary
Cohasset Sewerage Collection System and WWTF	18.0 km	0.45	Advanced
South Essex Sewer District WWTP	20.8 km	29.71	Secondary
Scituate Sewerage Collection System and WPCF	27.1 km	1.6	Advanced

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

QUESTIONS

Frequently asked questions about this plant

What capacity does WWTP MWRA Deer Island WWTF report?

Reported size: 310 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.