Public Works and Environmental Services

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703-324-5800 TTY 711
12000 Government Center Parkway
Suite 449 Fairfax, VA 22035
Carey Needham
Director, Capital Facilities

Pohick Interceptor Rehabilitation Phase 1

Project Number; WW-000028-013

Project Update: March 4, 2024

Project Background

This project is for the renewal and rehabilitation of 6,500 linear feet of 30-inch to 54-inch critical large diameter sanitary sewer pipe and associated manhole structures located in the Mount Vernon and Springfield Districts of Fairfax County. The renewal method was selected as trenchless rehabilitation using the CIPP method. CIPP is commonly used in similar applications due to its cost-effectiveness, schedule benefits and limited impact to residents and environment.

According to the National Association of Sewer Service Companies, “Hundreds of millions of feet of CIPP are in service throughout the world today, and it is considered the most widely accepted pipeline rehabilitation technology worldwide.” The project will follow all applicable industry standards, including ASTM F126, Standard Practice for rehabilitation of Existing Pipeline and Conduits by the Inversion and Curing of a Resin-Impregnated Tube as well as safety standards set by the Occupational Safety and Health Administration.

Project Location

Map: Pohick Rehab project
Southern Portion of Cross County trail beginning at the trailhead of Wadebrook Terrace


Project Phase

The project is in the final stages of the design phase and will be advertised for bid Spring 2024.

Project Benefits

The rehabilitation of the Pohick interceptor will:

  • Proactively renew the asset for the next 50 years
  • Prevent potential costly emergency repairs
  • Reduce risks to public health and the environment
  • Enhance the quality of life for Fairfax County Residents
  • Provide residents with safe, reliable utility infrastructure


Phase Anticipated End Date
Design Spring 2024
Construction Summer 2024 - Fall 2025


What to Expect

In the current design phase, residents and trail goers might see Fairfax County Staff and their representative contractors completing non-invasive survey of the surrounding trail and trees, or completing site walks.

During the construction phase, some trails access will be limited or rerouted. There will be an initial 3-month closure of the cross-county trail for the extent of the project area. Once the work at the northern end of the project area is complete, the Cross-county trail will be reopened with the detour along Pohick Road. This detour will be in effect for a 12-15 month duration while the remaining rehabilitation is completed on this segment of the project. See temporary closure map for reference.

As part of this work, the sanitary sewer flow will need to be by-passed for the rehabilitation to take place under dry pipe conditions. A series of by-pass pumps, and piping will be installed above ground reroute the sewer flow to a discharge manhole located in the vicinity of Wadebrook Terrace. See the photos below for an example of this setup. Notifications for this work will be updated on the website as well as shared on the Fairfax County Park Authority page. Trail closure and projects signs will also be posted in the Pohick Stream Valley Park.

Cross County Trail - Temporary Closure Map

Typical By-pass setup
Typical By-pass setup
By-pass pump
By-pass pump

Project Cost and Funding Source

The engineer’s preliminary opinion of the cost for this project is $14 million and it is being fully funded through sewer service charges from existing customers and availability charges, which are one-time fees for the initial connection to the system. No tax dollars are funding these improvements.


For more information, please email Sara Ferrance, Engineer IV Fairfax County Wastewater Collection Division at or call our residential wastewater 24-Hour Trouble Response Center 703-323-1211 | TTY 711

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