Browse › Fairfax County › Data center

Westfax Property Owner A LP/Westfax 4-5A

Planned on Virginia DEQ's records · 4155 Westfax Drive, Chantilly 20151 · Fairfax County · ZIP 20151

See it on the map

Air permits

• 74331-1, issued Mar 4, 2026 (Article 6 - mNSR)

Schools within 2 miles

• Westfield High (Chantilly), 1.00 mi
• Franklin Middle (Chantilly), 1.98 mi

Other data centers within 1 mile

• Amazon Data Services, Inc. IAD-1 IAD-90.09 mi
  Operating 4101-A West Fax Drive, Chantilly · Fairfax County · air permit Oct 11, 2024
• Flint Road Owner LLC0.30 mi
  Planned 14790 Flint Lee Road, Chantilly · Fairfax County · no issued air permit on DEQ's list yet
• Amazon Data Services Inc - IAD-134/135/1360.47 mi
  Operating 3980 Virginia Mallory Drive, Chantilly · Fairfax County · air permit Jul 29, 2026

County filings within 2 miles

1 filing (land-use applications and site plans) that mention a data center, from Loudoun County records; 0 still in county review. Filings come before any DEQ air permit, so some of these may not be on DEQ's records yet.

• FIREFOX DULLES1.85 mi
  Approved by the county Rezoning ZMAP-2021-0018, filed Oct 15, 2021 · Loudoun County · on the map
  FIREFOX DULLES : A Zoning Map Amendment ( ZMAP ) to rezone the parcel to the Planned Development-Industrial Park ( PD-IP ) zoning district to allow the development of data center uses the Property up to an FAR of 0.6,…

Source

DEQ Air Sites record 74331 (permit class: 80% Synthetic Minor). The stage is DEQ's own. This page is rebuilt every morning from DEQ's records.