9 rules for unincorporated Loudoun County, Virginia.
Verified from official government sources
Loudoun County Codified Ordinances Chapter 684 prohibits unreasonable noise audible across property lines 10 PM to 7 AM. VA Code §15.2-1200 and §18.2-415 provide enforcement authority for Dillon's Rule counties.
Loudoun County restricts construction noise to 7 AM to 9 PM weekdays and 9 AM to 9 PM weekends/holidays under Chapter 684. Data center construction in Ashburn follows same rules but with frequent variances.
Loudoun County Chapter 612 makes persistent barking that disturbs neighbors a nuisance. Loudoun Animal Services (703-777-0406) investigates; agricultural operations protected by Right to Farm.
Loudoun County has no leaf-blower-specific restrictions; use falls under general noise ordinance timing limits. Many Ashburn, Brambleton, and Leesburg HOAs set stricter landscaping hours.
Loudoun County requires special event permits for amplified sound at public venues. Loudoun's wine and wedding industry concentrates events in rural western county under AR-1/AR-2 zoning.
Ashburn sits directly in Dulles International Airport flight paths, making aircraft noise a major community concern. The FAA controls all flight paths — Loudoun County has no direct authority. The county established the Airport Impact Overlay District in its zoning ordinance. The Board of Supervisors has lobbied the FAA to alter departure procedures west of Dulles. Noise complaints go through the Metropolitan Washington Airports Authority (MWAA) system.
Industrial noise in unincorporated Loudoun County is governed by Section 5-1507 (Noise Standards) of the Zoning Ordinance, with Table 5-1507(E) capping sound at the receiving property line at 55 dBA for residential, 60 dBA for mixed-use, 65 dBA for commercial/civic, and 70 dBA for industrial uses. Loudoun County Code Chapter 654 (Excessive Sound) adds a criminal layer enforced by the Sheriff. Recent data center amendments (ZOAM-2024-0001, adopted March 18, 2025) require Special Exception review and impose specific noise study, soundproofing, and generator-testing standards on data centers near residential property.
Loudoun County Zoning Ordinance Section 5-1507 sets maximum A-weighted sound levels: 55 dBA at residential property lines (day and night). Commercial receiving zones allow 60 dBA. These limits are increasingly relevant as data center cooling equipment generates continuous noise near residential areas. Phase 2 of data center regulations (approved September 2025) is reviewing noise standards.
Loudoun County prohibits sound audible inside another person's residential dwelling with doors and windows closed under Codified Ordinance Chapter 654.02. Amplified music and voice are specifically referenced in the zoning noise standards (Section 5-1507). Special event permits may authorize amplified sound for festivals and community events. Fines range from $500 to $2,500.
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