Environmental Rules in Loudoun County, VA (2026)
4 rules for unincorporated Loudoun County, Virginia.
Verified from official government sources
Stormwater Management
Loudoun County runs a Virginia Erosion and Stormwater Management Program requiring a Land Disturbance Permit, and often an approved Erosion & Sediment Control Plan or Stormwater Management Plan, before land-disturbing activity begins. Thresholds scale from under 5,000 square feet up to one acre or more.
Loudoun County Erosion & Stormwater Permit Rule
Significant RestrictionsLoudoun County, VA, Codified Ordinances § 1096.01(e)(2)
(e) Virginia Erosion and Stormwater Management Program Established. (1) Pursuant to Section 62.1-44.15:27 et seq. of the Code of Virginia, Loudoun County hereby establishes a VESMP for land-disturbing activities... (2) ... A. Land-disturbing activity shall not be commenced unless and until the following have been met: 1. For land-disturbing activity that disturbs less than 5,000 square feet... ...
Erosion Control
Any land-disturbing activity in Loudoun County needs a Land Disturbance Permit and an approved Erosion and Sediment Control Plan before work starts, with a full VESMP stormwater permit added once disturbance reaches an acre. The Department of Building and Development administers the program and can assess civil penalties up to $5,000 per repeat offense.
Loudoun County Erosion & Stormwater Permits
Significant RestrictionsLoudoun County, VA, Codified Ordinances § 1096.01(e)(2)(A)
Land-disturbing activity shall not be commenced unless and until the following have been met: 1. For land-disturbing activity that disturbs less than 5,000 square feet, for which a Land Disturbance Permit is required pursuant to the Loudoun County Zoning Ordinance... Approval of a Land Disturbance Permit... and Approval of an ESC Plan... 3. For land-disturbing activity that disturbs one acre or...
Flood Zones
Loudoun's Floodplain Overlay District locks down every parcel mapped in the FEMA-based floodplain, permitting only the specific uses listed in Zoning Ordinance §§ 5.03.E and 5.03.F -- even uses otherwise allowed by the underlying zoning district are barred unless the FOD list also allows them.
Loudoun County Floodplain Overlay District Rules
Significant RestrictionsLoudoun County, VA, Zoning Ordinance § 5.03.A
These provisions apply to all privately and publicly owned lands within the jurisdiction of the County of Loudoun and identified as being located within the Floodplain Overlay District (FOD). Only those uses set forth in Section 5.03.E and 5.03.F will be permitted or Special Exception uses within the FOD, and land so encumbered may be used in a manner permitted in the underlying Zoning District...
Flood Elevation Requirements
New or substantially improved homes in Loudoun's Major Floodplain must have their lowest floor, including the basement, elevated to or above base flood elevation, with a 1-foot freeboard margin recommended; nonresidential buildings may flood-proof instead if a licensed engineer certifies the design.
Loudoun County Base Flood Elevation Standards
Some RestrictionsLoudoun County, VA, Zoning Ordinance § 5.03.I.1.a-b
Residential Construction. New construction or substantial improvement of any residential structure (including manufactured homes) must have the lowest floor, including basement, elevated to or above (1 foot freeboard recommended) the base flood elevation; Nonresidential Construction. New construction or substantial improvement of any commercial, industrial, or nonresidential building (including...
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