Sue Data Centers

Data Center Registry

Csquare BOS4 (Watertown)

Watertown, Middlesex County, Massachusetts · All 8 Csquare sites

OperatingNo reception on recordRecord updated October 24, 2026

Csquare BOS4 (Watertown) is an operating data center in Watertown, Massachusetts (Middlesex County), operated by Csquare (formerly Centersquare).

Every line on this page traces to a public source listed at the bottom. Where a figure was looked for and not found, the row says so. A blank is never a zero.

Facility record

Operating

Operator
Csquare (formerly Centersquare)
Facility type
Data center
Location
486 Arsenal Way, Watertown, Middlesex County, MA, 02472
Coordinates
42.3658, -71.1581 (approximate)
Power capacity
Not established from a public source
Land
Not established from a public source
Investment
Not established from a public source
Announced
Not established from a public source
Utility
Not established from a public source
Power source
Grid
Cooling
Not established from a public source
Water use
Not established from a public source
Jobs
Not established from a public source
Public subsidy
Not established from a public source
Community reception
No reception on record
Source confidence
Confirmed by multiple independent sources or official documentation

Timeline from the record

Newest first. Record entries come from the filings and reports the registry cites. Coverage entries are headlines from publisher feeds we monitor daily, linked to the outlet; last checked September 14, 2026.

  1. October 24, 2026
    Operating
    Marketed as a live colocation facility on the operator's 2026 spec sheet and listed on PeeringDB. Source: Csquare

Opposition and litigation at this site

Nothing on record as of October 24, 2026. No lawsuit, organized opposition, or contested hearing over Csquare BOS4 (Watertown) in Watertown, Middlesex County, Massachusetts appears in the sources this registry tracks. That is an absence in our sources rather than a finding that none exists, and local opposition often predates any coverage a national dataset would pick up.

If you live near this site and something is happening that this page does not show, that is worth telling us. Send us the document and it goes in the record with the source attached. For sites where opposition is already established, see every contested site we track.

A new status, a permit, a reception finding, or a lawsuit. Nothing else, ever.

Power and water

The operator spec sheet lists utility capacity of 19.1 MW, UPS capacity of 4 MW and generator capacity of 14 MW. These are utility and UPS figures, not IT load.

The operator spec sheet lists 'chilled water' cooling. The heat-rejection method is not stated.

Notes on the record

Colocation facility of 38,977 sq ft in Watertown.

What the record does not establish, and the document that would

In every fight on our tracker the decisive fact came out of a public records request. These are the requests for this site.

  • Power capacity in megawatts
  • Cooling method and water use
  • Tax abatements or other public subsidy
  • Permanent jobs promised
  • Land area
  • How the community has received it
  • Which utility serves it
Which document closes each gap
Power capacity in megawatts
The utility's large load service agreement, the interconnection request in the grid operator's queue, or the electrical site plan in the permit file.
Cooling method and water use
The water service agreement, any groundwater appropriation permit, and the mechanical narrative in the site plan.
Tax abatements or other public subsidy
The abatement, PILOT, or development agreement approved by the county, city, or development authority, and the state's data center sales tax exemption certificate if one was issued.
Permanent jobs promised
The economic development application or incentive agreement, which usually states a job commitment and a clawback.
Land area
The rezoning application, the plat, or the deed recorded with the county.
How the community has received it
Planning commission and governing body minutes, public comment records, and any petition or lawsuit filed in the county.
Which utility serves it
The electric service agreement or the utility's filing with the state public utility commission.

Have one of these documents? Send it to us and we will add it to the record with attribution.

Other sites within 30 miles

Distances are between recorded coordinates, many of which are a city or county centroid, so treat them as approximate. Cumulative load on one utility and one aquifer is the question a planning commission rarely asks.

Tell us about your situation

Living near Csquare BOS4 (Watertown)?

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Questions people ask about this site

Is there opposition to the Csquare BOS4 (Watertown) data center in Watertown?

Nothing on record as of October 24, 2026. No lawsuit, organized opposition, or contested hearing over Csquare BOS4 (Watertown) in Watertown, Middlesex County, Massachusetts appears in the sources this registry tracks. That is an absence in our sources rather than a finding that none exists, and local opposition often predates any coverage a national dataset would pick up.

Has anyone filed a lawsuit over the Csquare BOS4 (Watertown) data center?

No lawsuit over Csquare BOS4 (Watertown) appears in the record we track as of October 24, 2026. Residents most often reach a lawyer over water supply, well drawdown, noise from cooling plant, property value, or a rezoning approved without the notice the ordinance required. If any of that is happening near this site, it is worth a review whether or not a case has been filed yet.

How much water does Csquare BOS4 (Watertown) use?

No water withdrawal figure for Csquare BOS4 (Watertown) is on record here. Water use is rarely published voluntarily; it usually surfaces through a utility service agreement or a state withdrawal permit, both of which are public records. We leave the number blank rather than estimate one.

Who operates Csquare BOS4 (Watertown), and how big is it?

Csquare (formerly Centersquare) is the operator on record. We hold 8 sites for that company across the registry. No capacity figure is on record for this site.

How to cite this page

SueDataCenters.org Data Center Registry, "Csquare BOS4 (Watertown)," updated October 24, 2026, https://suedatacenters.org/data-centers/csquare-bos4-watertown-ma.

Facility data from Compute Atlas (E. Kubiak), version 1.34.1 (October 4, 2026), licensed CC BY 4.0, record https://www.compute-atlas.com/facilities/csquare-bos4-watertown-ma, retrieved October 29, 2026.

Corrections with a public source are welcome at the Compute Atlas record or through our contact page. The whole registry is available as CSV and JSON under CC BY 4.0.

Sources for this record

As compiled and cited by Compute Atlas, with our own reporting appended. Archived links are used where the original has moved.

  1. 1.Csquare Boston Market spec sheet (BOS1 / BOS4) · Csquare · retrieved October 24, 2026
  2. 2.PeeringDB facility 6678: Centersquare Boston (BOS4-A) · PeeringDB · retrieved October 24, 2026

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