Virginia authorities ordered Microsoft to pay a $2.5 million fine for air pollution linked to its Leesburg data center.
Virginia’s Department of Environmental Quality (DEQ) has ordered Microsoft to pay a $2.5 million civil charge for air pollution emissions from a data center it operates in Leesburg. The penalty stems from a June 2025 substation failure that left the facility on Compass Creek Parkway without grid power. For seven days, the data center relied on 62 diesel-powered emergency engines, causing it to exceed permitted emission limits for gases and particulate matter, including carbon monoxide and nitrogen oxides.
DEQ officials and Microsoft representatives spent approximately eight months negotiating how to accurately measure the emissions generated during that week before agreeing on a final estimate.
Under the order issued Monday, Microsoft must pay a $99,000 direct fine. The remaining $2.4 million will be allocated to the DEQ to purchase air quality monitoring equipment. Approximately $1.5 million will fund a mobile air monitoring station capable of reporting EPA-certifiable data, while roughly $900,000 will finance 45 air quality monitoring sensors for the agency’s Data Center Air Monitoring Project. Any unspent funds will revert to the DEQ. This marks the largest fine Virginia has ever levied against a data center for air quality violations.
For context on the company’s operational scale, Microsoft’s capital expenditures on data centers totaled more than $37.5 billion in the second quarter of fiscal year 2026, according to Data Center Dynamics. In response to the penalty, Microsoft stated in a statement provided to WJLA: “Microsoft is committed to responsible data center development and operation in Virginia and around the world. During this event last June, we worked closely with the Virginia Department of Environmental Quality, providing regular updates on our response as we worked toward a resolution.”
The enforcement action arrives amid growing scrutiny of the state’s relationship with the data center industry. Recently, DEQ staff appeared to rush to the defense of the sector following a report that found Loudoun County’s Vantage Data Center facility, despite operating at permitted emission limits, “would contribute to measurable air pollution and health burdens across surrounding communities, including populous areas and communities already experiencing cumulative environmental and socioeconomic stressors.” Local residents have repeatedly complained about air pollution from data center backup generators throughout the county. Consequently, Loudoun County supervisors are currently overhauling their approach to data center development, while Northern Virginia residents organizing in opposition are demanding that democratic processes govern project approvals and expansion. Public sentiment remains a focal point, underscored by a recent Patch survey examining American views on the ongoing data center and artificial intelligence boom.