Loudoun County, VA Data Centers & Crypto Mining: Data Center Noise Limits (2026)
Key Facts
- Data Center Cap
- 55 dB(A) at residential line
- Applies
- All hours, day and night
- Measurement
- Receiving lot line, 5 ft height
- Noise Studies
- Pre- and post-construction, PE-certified
- Governing Code
- Zoning Ordinance § 7.05.03
Summary
Data centers in Loudoun County must not exceed 55 dB(A) at the property line of any adjacent lot that permits a single-family home, measured at all hours. Applicants file pre- and post-construction noise studies by a licensed engineer, with mitigation required if the cap is exceeded.
The maximum allowable impulsive sound emitted from the specific use, as measured at the lot line of any adjacent lot that permits a single-family dwelling as a principal use, is 55 dB(A).
3. Outdoor Music. Outdoor music is not permitted after 11:00 p.m.
G. Noise Study. For Covered Activities, or as otherwise required pursuant to Chapter 4, subject to a Noise Study requirement, the following Pre-Construction and Post-Construction studies must be prepared by a Commonwealth Licensed Professional Engineer (PE) verifying the applicable maximum sound level pursuant to Table 7.05.03-1 as measured at the nearest point of each property line:
1. Pre-Construction Study. A noise study of existing conditions at the time of Site Plan review submitted to the County concurrently with the initial submission of the Site Plan;
2. Post-Construction Study. A noise study of existing conditions at the time of operations, submitted to the Zoning Administrator at least 1 month but no more than 12 months after the issuance of the first Certificate of Occupancy; and 3.
Full Breakdown
Loudoun County Zoning Ordinance Section 7.05.03 caps A-weighted sound at the receiving lot line, and these limits apply at all times of day and night. The general table allows 55 dB(A) for residential and rural-economy receiving uses, 60 for mixed-use residential, 65 commercial, and 70 industrial. For data centers, Section 7.05.03.F sets a firm 55 dB(A) impulsive-sound ceiling at any adjacent lot line permitting a single-family dwelling and bars noise-producing activity within 250 feet of an existing dwelling. A Commonwealth-licensed professional engineer must submit a pre-construction noise study with the Site Plan and a post-construction study within one to twelve months of the first Certificate of Occupancy; if either exceeds 55 dB(A), the owner must build engineer-certified mitigation.
Violations & Fines
Exceeding 55 dB(A) at a residential lot line violates Section 7.05.03; the Zoning Administrator can require engineer-certified noise mitigation, withhold or revoke certificates of occupancy, and pursue zoning enforcement until measured sound conforms.
Frequently Asked Questions
How loud can a Loudoun County data center be?
Does Loudoun require a noise study for data centers?
Sources & Official References
Other rules in Loudoun County
Compare Loudoun County to another location·View the Virginia data centers & crypto mining overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.