Loudoun County, VA Landscaping Rules: Rainwater Harvesting (2026)

Virginia is a rainwater-friendly state. VA Code §15.2-2114.01 specifically authorizes rainwater harvesting as a stormwater management practice, and VA Department of Health (VDH) regulations (12VAC5-630) allow potable reuse with appropriate treatment. Loudoun County has no ordinance restricting residential rainwater collection. Rain barrels (typically 50-75 gallons) can be installed with no permit. Loudoun Soil and Water Conservation District (LSWCD) has historically offered rain barrel workshops and occasional subsidized purchase programs. Cisterns over 2,500 gallons or any system with indoor plumbing connections require Loudoun County Building Permit and must meet Virginia Uniform Statewide Building Code (USBC) plumbing provisions. Potable rainwater use requires VDH-compliant treatment (typically sediment filter, activated carbon, and UV disinfection); well/cistern installation must be reviewed by Loudoun Environmental Health. Rainwater harvesting supports Chesapeake Bay Preservation Act goals by reducing impervious runoff — Loudoun's stormwater management ordinance (Ch. 1096) credits rain gardens and cistern-based runoff capture. HOAs in planned communities (Brambleton, Broadlands, Ashburn Village) often have aesthetic covenants — rain barrels may need to be screened or placed behind fences. Several newer Loudoun developments incorporate cistern systems in green-building designs.