EPA Air · stack tests by county and year
Air-emissions stack tests in Loudoun County, Virginia, 2026
- 12Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Loudoun County, Virginia during 2026. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Loudoun County facility page.
Loudoun County, Virginia, 2026
- Inspections 48
Air-emissions stack tests in Loudoun County, other years
Air-emissions stack tests recorded in Loudoun County, Virginia, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-04-30 | ALIGNED DATA CENTERS IAD03 | Pending | State |
| 2026-04-29 | AMAZON DATA SERVICES, INC. IAD 50 IAD 60 IAD-71 IAD-78 IAD-79 IAD-80 | Pass | State |
| 2026-04-24 | NTT GLOBAL DATA CENTERS AMERICAS, INC. | Pass | State |
| 2026-04-24 | AMAZON DATA SERVICES, INC. IAD-144 IAD-145 | Pass | State |
| 2026-04-24 | MICROSOFT CORPORATION â LEESBURG DATA CENTER (IAD01-02-03-04-05) — high-priority violation on file | Pending | State |
| 2026-04-22 | AMAZON DATA SERVICES, INC. IAD-51 IAD-56 IAD-88 IAD-89 | Pass | State |
| 2026-04-22 | MICROSOFT CORPORATION â LEESBURG DATA CENTER (IAD01-02-03-04-05) — high-priority violation on file | Pending | State |
| 2026-03-13 | COMPASS IAD DATACENTER | Pass | State |
| 2026-03-06 | ISKANDER (LC-1A) JAMSHID (LC-1B) KAVEH (LC2) LOHRASP VENTURES (LC3) — high-priority violation on file | Pass | State |
| 2026-03-05 | WHEELER DATA CENTER | Pending | State |
| 2026-03-05 | STACK INFRASTRUCTURE - SI NVA06A LLC | Pass | State |
| 2026-02-27 | VANTAGE DATA CENTER VA3 LLC — high-priority violation on file | Fail | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.