- Departments & Offices
- General Services
- Water Programs & Services
- Stormwater Management Program
Stormwater Management Program
Loudoun Awarded Matching Grants for Water Quality Improvements
02-07-23: The Virginia Department of Environmental Quality has approved matching grants of more than $4 million from the Stormwater Local Assistance Fund for four local projects designed to reduce water quality pollutant loads in local waterways and the Chesapeake Bay. Read details in this news release.
Stormwater Management Program
This countywide program addresses the design, development, improvement, operation, inspection, maintenance, and oversight of the stormwater management system.
- Certain federal and state criteria concerning the quality and quantity of stormwater runoff must be met as population grows.
- The eastern, urbanized area of Loudoun County has been included by the Environmental Protection Agency and the Commonwealth of Virginia.
- Stormwater discharge permits are required under the National Pollutant Discharge Elimination System (NPDES) phase II requirements.
- Control of the quality and quantity of the runoff is essential to the overall health of our people and our natural resources.
- The county adopted Chapter 1096: Stormwater Management Ordinance on October 20, 2003.
Report a Problem
Residents who have a complaint regarding stormwater are encouraged to contact the county by telephone, complete a stormwater request on LEx (Loudoun Express Request), or send an email.
- The Stormwater Complaint phone number is 703-777-0117.
- Use LEx (Loudoun Express Request) to report a stormwater issue or storm drain dumping.
- Email the Stormwater Team.
Six Minimum Control Measures
Under the National Pollutant Discharge Elimination System (NPDES) Phase II regulations, Loudoun County must prepare a stormwater management program containing elements that address the following six technical areas:
- Construction site runoff control
- Illicit discharge detection and elimination
- Pollution prevention / good housekeeping
- Post-construction runoff control
- Public education and outreach
- Public participation / involvement
Stormwater Management Plan
Each of these areas, identified as minimum control measures in the NPDES Phase II regulations, is discussed in the Loudoun County Stormwater Management Plan (PDF). For each of the minimum control measures, communities must identify best management practices (BMPs) and measurable goals that reflect the communities’ choices about how to satisfy the regulatory requirements. These BMPs and goals form the basis on which the success of the Phase II program can be evaluated in each community, which is ultimately the degree to which the community is satisfying the water quality requirements of the Clean Water Act.
To assist communities, the Virginia Department of Environmental Quality (DEQ), along with the Environmental Protection Agency (EPA), has specified the minimum requirements for each of the six control measures along with recommended program elements. While Virginia’s two environmental agencies, VDEQ, and the Virginia Department of Conservation and Recreation (VDCR) continue the process of developing a unified Virginia BMP manual, the EPA has developed and is continuing to revise a list of potential BMPs that communities might use to satisfy the Phase II program requirements.
Best Management Practices
To arrive at appropriate best management practices, the county engaged in an extensive assessment of the existing stormwater management operations, ordinances, and programming against the compliance requirements of the Virginia Department of Environmental Quality General Virginia Stormwater Management Program (VSMP).
A best management practice (BMP) is a technique, process, activity, or structure used to reduce the pollutant content of a stormwater discharge. BMPs include simple nonstructural methods, such as good housekeeping and preventive maintenance. BMPs may also include structural modifications, such as the installation of bio-retention measures. BMPs are most effective when used in combination with each other, and customized to meet the specific needs (drainage, materials, activities, etc.) of a given operation. The focus of EPA’s general permits is on preventive BMPs, which limit the release of pollutants into stormwater discharges. BMPs can also function as treatment controls.
Videos: Illicit Discharge Detection & Elimination
- 30 second version (Spanish)
- 1 minute version (Spanish)
- 2 minute version (Spanish)
- 5 minute version (Spanish)
- 10 minute version (Spanish)
- Only Rain (Northern Virginia Regional Commission Clean Water Partners)
- Award-winning Stormwater Management Project from Purcellville Girl Scout Cara Broshkevitch
- Storm drain marking program (PDF) and Instructions (PDF)
- Loudoun Watershed Watch
- Loudoun Wildlife Conservancy
- Virginia Water Monitoring Council
- Goose Creek Association
- Audubon Naturalist Society
- Virginia Department of Environmental Quality
- Virginia Department of Conservation and Recreation
- Loudoun Phase II Bay Total Maximum Daily Load (TMDL) Action Plan_2022 Update_Final 3-6-22 (PDF)
- MS4 Permit Coverage Letter (PDF)
- MS4 Small General Permit (PDF)
- Program Plan 2018-2023 (PDF)
- Stormwater Public Education Outreach Program (PDF)
- Loudoun Local TMDL Action Plan (PDF)
- MS4 Annual Report - Year 1 (PDF)
- MS4 Annual Report - Year 2 (PDF)
- MS4 Annual Report - Year 3 (PDF)
- MS4 Annual Report - Year 4 (PDF)