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State-Mandated Stormwater Management Program History
Current Status: Board Adopts Amendments 
The Loudoun County Board of Supervisors approved amendments to Chapter 1096 of the Codified Ordinances at its business meeting on Wednesday, May 21, 2014. The item prepared for the meeting, which includes the draft text, is online as is the Copy Teste, which is a summary of action taken by the Board:

At the Board of Supervisors public hearing on March 12, 2014, the Board voted to forward the proposed amendments to the March 21, 2014, meeting of the Board’s Transportation and Land Use Committee.The item prepared for the meeting is online:


The item prepared for the Board of Supervisors March 12, 2014, public hearing also is online:


The Planning Commission considered the proposed amendments at its February 4, 2014, worksession. Documents prepared for the meeting are online:

The Planning Commission also considered the amendments at its January 23, 2014, public hearing:

In addition, the draft documents were submitted to the Virginia Department of Environmental Quality (DEQ) on January 15, 2014, along with other programmatic documents such as review checklists and standard operating procedures, for official review. DEQ staff will provide comments to county staff regarding necessary adjustments to ensure compliance with state regulations. 

At its October 2, 2013, business meeting, the Board of Supervisors adopted an intent to amend the county’s Stormwater Management Ordinance (Chapter 1096 of the Codified Ordinance). County staff has since worked with the Facilities Standards Manual (FSM) Public Review Committee on developing draft Codified Ordinance and FSM amendments

Frequently Asked Questions
Frequently asked questions and answers about the Stormwater Management Program Update are online:
Program Overview
Revisions to the state Stormwater Management (SWM) regulations were adopted May 24, 2011, with an effective date of September 13, 2011. These revisions are required to be implemented by all Virginia localities no later than July 1, 2014. Under the new regulations, localities such as Loudoun - which are currently designated as a “Plan Approving Authority” by the Virginia Soil and Water Conservation Board - will be re-designated as a Virginia Stormwater Management Program (VSMP) Authority.  Along with additional administrative responsibilities that come with the re-designation, the revised state requirements also include new technical criteria for SWM that will impact land development applications.

SWM has been implemented in Loudoun County in various forms since the late 1980s, through tools such as development proffers, regional water quality standards, and various technical standards located in the Loudoun County Facilities Standards Manual (FSM). Such efforts culminated in Loudoun’s first Stormwater Management Program, which was established by ordinance in 2003.

SWM entails control of both the quantity and quality of stormwater runoff. Its proper implementation is an essential part of land development, both during and after construction, because the associated increases to the runoff volume and peak flow rate and the disruption of natural drainage patterns can lead to damage of downstream properties in the form of erosion, sediment deposition, and/or flooding. Similarly, increases in pollutant discharge and water temperature can lead to degradation of the quality of water flowing through natural streams, which can negatively affect public health, as well as recreational and economic pursuits and aquatic habitat.  Accordingly, a chief goal of SWM strategies, design, and Best Management Practices (BMPs) is to replicate pre-development drainage patterns and pollutant loading from non-point sources. 

Note: While the revised regulations require all Virginia localities to operate their own local SWM program, incorporated towns which do not have a Municipal Separate Storm Sewer System (MS4) program are given the option of being subject to the surrounding county’s SWM program. In Loudoun County, Leesburg is currently the only incorporated town that has an MS4 program.

For More Information
For more information about the project, contact James Edmonds, Department of Building & Development, by email or by calling 703-777-0220. 

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