8 rules for unincorporated Loudoun County, Virginia.
Verified from official government sources
Loudoun County enforces robust stormwater management under Ordinance Chapter 1096 and the Virginia Stormwater Management Act (VA Code §62.1-44.15:24). Land disturbance over 2,500 sq ft in Chesapeake Bay Preservation Areas (RPA) or 10,000 sq ft elsewhere triggers stormwater plan review. VSMP permits issued through Loudoun Building & Development. Ashburn data center construction is a major stormwater compliance area. Low-impact development (rain gardens, bioswales, permeable pavers) encouraged.
Loudoun County enforces the Virginia Erosion and Sediment Control Law (VA Code §62.1-44.15:51) through Loudoun Ord. Ch. 1244. Any land disturbance of 10,000 sq ft or more requires an Erosion & Sediment Control (E&SC) permit; stricter 2,500 sq ft threshold inside Chesapeake Bay RPAs. Required BMPs: silt fence, sediment traps, stabilized construction entrances, soil stabilization. Certified Responsible Land Disturber (RLD) oversight required on-site. Violations carry daily fines up to $32,500.
Loudoun County is not a coastal locality — it lies 90+ miles inland from the Atlantic and is not subject to the Virginia Coastal Zone Management Program or tidal water regulations. The county does have the Potomac River as a northern boundary (non-tidal above Great Falls) and participates in the Chesapeake Bay Preservation Act through Ord. Ch. 1220 which imposes 100-ft Resource Protection Area (RPA) buffers along perennial streams. No sea-level rise planning applies. No Virginia Marine Resources Commission (VMRC) jurisdiction.
Loudoun County participates in the National Flood Insurance Program (NFIP) and enforces floodplain management under Codified Ordinances Chapter 1340. FEMA flood zone maps (current effective date February 2012, with amendments) designate Special Flood Hazard Areas (SFHAs) along Potomac River, Goose Creek, Catoctin Creek, Broad Run, Sugarland Run, and numerous smaller streams. New construction in SFHA requires Base Flood Elevation (BFE) plus 2 ft freeboard. Floodways prohibit all construction. Flood insurance required for federally-backed mortgages in SFHAs.
Loudoun County requires grading permits integrated with building permits and Erosion & Sediment Control approvals for land disturbance over 10,000 sq ft (2,500 sq ft in RPA). Drainage cannot be redirected to neighboring properties per common-law and the Facilities Standards Manual. Retaining walls over 4 feet require engineering and permits. Compaction testing required for structural fill. Loudoun's rolling terrain and clay soils make grading compliance especially important. VDOT drainage coordination required where near public roads.
Sea wall maintenance regulations do not apply to Loudoun County. Loudoun is an inland county in northern Virginia with no ocean or tidal waterfront. The county's waterways consist of the Potomac River and its tributaries, which are regulated under different riparian frameworks. Shoreline stabilization along the Potomac falls under Army Corps of Engineers and Virginia Marine Resources Commission jurisdiction.
Mangrove protection regulations do not apply to Loudoun County. Mangroves are tropical coastal plants that do not exist in Virginia. Loudoun County is an inland county approximately 50 miles from the Chesapeake Bay. The county's tree protection falls under its tree conservation ordinance and Chesapeake Bay Preservation Area regulations.
Boat dock permits have limited applicability in Loudoun County. The county borders the Potomac River but has no significant public marina infrastructure. Private docks on the Potomac require permits from the Virginia Marine Resources Commission (VMRC) and Army Corps of Engineers. Most Ashburn residents have no waterfront access — HOA ponds prohibit docks and boats.
See every category we cover for Loudoun County — parking, noise, fences, fires, animals, pools, and more.
Loudoun County Ordinance Hub →