Stormwater Management Pond Quick Reference Guide
QUICK REFERENCE GUIDE
Stormwater Management Ponds
Fairfax County, Virginia
- All dry stormwater management ponds are designed to retain stormwater temporarily and drain within two to three three days after the rain stops.
- The county maintainsmaintains over 1,000 dry ponds; an additional 400-500 dry ponds are privately maintained by the property owners.
- The majority of wet ponds (between 200-300) are privately maintained by the property owners; only a few (less than 10) are maintained by the county. See below for maintenance contact information.
- State and federal laws require that stormwater be controlled to prevent flooding and reduce pollutants. Stormwater management ponds are constructed to address these impacts of development.
- A dry pond with a shallow wetland marsh provides better treatment of polluted stormwater and poses less of a mosquito problem than a dry pond with lawn grass because of natural controls such as the fish, frogs and dragonflies associated with a wetland marsh ecosystem.
- Mosquito larvae require a minimum of 7-10 days in standing water or other suitable breeding environments to produce mosquitoes.
- The county has an inspection and treatment program for mosquito control through the Fairfax County Health Department (703-246-8931, TTY 711).
- Wet Pond: A wet detention pond has a permanent pool of water (wet pond photo).
- Dry Pond: A dry detention pond temporarily fills with water during a storm and retains it for up to 48 to 72 hours, but is dry most of the time (dry pond photo).
- Flood Control Pond: A flood control pond is a dry pond that stores stormwater runoff and then releases it slowly over a one to two hour period. It performs very little pollution treatment.
- Pollution Treatment Pond/Best Management Practice: Also called BMPs. A dry BMP is a dry pond that treats stormwater by retaining the water for 48 to 72 hours, allowing sediments and other pollutants to settle. All wet ponds are BMPs.
- Shallow Wetland Marsh: A shallow wetland marsh is a dry pond with 6- to 18-inch deep pools of water planted with a variety of wetland grasses, flowers, shrubs and trees.
- Stormwater Management
- To report a malfunctioning/blocked dry pond or for information on maintenance responsibility for a stormwater pond, please call the Maintenance and Stormwater Management Division at 703-877-2800, TTY 711, or use the Stormwater Management Pond Maintenance Request Form.
- To request an inspection for the presence and possible treatment of mosquitoes, please contact the Fairfax County Health Department at 703-246-8931, TTY 711.