Wastewater Ocean Outfall

PDF icon Ocean Outfall Town Hall Presentation Sept. 16, 2017.pdfThe City of Rehoboth Beach is required, under the terms of a consent order from the Dept. of Natural Resources, to eliminate the discharge of treated effluent from the Rehoboth Beach Wastewater Treatment Plant into the Lewes-Rehoboth Canal. The city, after detailed studies and the evaluation of all options, is proposing an ocean outfall in order to comply with that order.

Wastewater Outfall pathThis project consists of a new pump station and a 24 inch force main/pipe which are required to convey the treated effluent to the ocean outfall and to provide the head required to pump the effluent through diffusers located 6,000 feet offshore in water approximately 40 feet deep. Vertical turbine effluent pumps will be installed in the existing post-aeration tank. The force main will be aligned along the plant access road and end at the public access parking area at the beach near Henlopen Avenue.

The pipeline from the Rehoboth Beach Wastewater Treatment Plant to the ocean outfall was sized to handle the summer peak flow. As part of the overall project analysis, a detailed alignment study was completed to determine the best routing of the force main considering such issues as cost, environmental issues, permitting, potential interferences, traffic control and public concerns. The preferred alignment was selected based on the recommendations of the Rehoboth Beach Wastewater Treatment Plant Effluent Force Main Alignment Study.

Project Update 


The force main pipe installation has reached State Road. The contractor will continue on State Road next week heading towards Canal Street. This work is anticipated to take several weeks. The force main contractor has started work at Deauville Beach this week. The contractor is working adjacent to the Deauville Beach parking lot. The crew is scheduled to reach Henlopen Avenue by early January. The force main pipe will be installed on Henlopen Avenue on the north side of the road. Construction equipment will be limited to operating in the road right-of-way only. The work will proceed on Henlopen Avenue in the westerly direction towards Grove Park through April 2018. The contractor will not be working December 25 or January 1. 

PDF icon Force Main Project Schedule Update


Horizontal directional drilling at Deauville Beach will continue through mid-January. Residents may hear generators and drilling equipment in the form of a steady hum during this time. Pipe fusing continues on barges located in the Broadkill River. The installation of the trench section of the outfall pipe east of Deauville Beach is now anticipated for next week, weather dependent. Several barges and support vessels will be visible from shore during this work. Signage has been posted for pedestrian tennis court access on the west side of the construction fence at Deauville Beach. The contractor plans to take a short break from December 22-26. Operations will resume on December 27.  

 PDF icon Ocean Outfall Three Week Lookahead Schedule
 PDF icon Ocean Outfall Project Schedule Update


  • The force main contractor will notify property owners on-site a week before and the day before work is nearing your home. We will also keep you updated with construction schedules via email as they become available. The contractor is required to maintain access, water, electric, and sewer service to all properties during construction. However, there will be a temporary 6-hour water and sewer shut off while work is being performed in front of your property.  
  • The contractor will work to ensure disruptions are minimized during construction operations and will restore all work sites to their original condition as quickly as possible.
  • All traffic will be maintained around construction zones. The contractor will utilize maintenance of traffic standards established by DelDOT for traffic control, including signage and protective barriers that will be set up to maintain public safety during construction.
  • Provisions will be made to ensure that the contractor allows refuse pickup and mail service to be maintained during the force main project.
  • The force main contractor working hours are Monday through Friday from 7:00 am to 6 pm. The ocean outfall contractor working hours are 6 am-6 pm at Deauville Beach Monday through Saturday. Marine work is 24/7.  
  • Construction completion:  Ocean Outfall April 2018 – Force Main May 2018

For questions, please contact the Communications Department at 302-227-6181 ext. 522 or [email protected]. Thank you in advance for your cooperation and patience.

On August 14, 2017, the Rehoboth Beach Commissioners unanimously approved awarding four bid packages to various contractors to begin construction on the ocean outfall project. The project consists of a new pump station and 24-inch force main, which are required to convey the treated effluent to the ocean outfall and to provide the head required to pump the effluent through diffusers located 6,000 feet offshore in water approximately 40 feet deep. The bids totaled $37,381,407. The ocean outfall bid was awarded to Manson Construction of Seattle, Washington, for $27,655,850. Allan Myers Construction of Worcester, Pennsylvania, was awarded the effluent pumping station bid for $1,768,555, and the wastewater treatment plant upgrades for $2,256,555. A-Del Construction of Newark, Delaware, won the force main bid for $5,700,447. Contractors were pre-qualified by GHD, the engineering company for the project. Steps taken to pre-qualify were assessing each contractor's project completion record, reviewing their performance on similar projects, safety record, insurance coverage and other factors. Mobilization of equipment will tentatively begin October 1, 2017, and work is to be completed by April 30, 2018.

On August 7, 2017, the Rehoboth Beach Commissioners unanimously approved a renewed and expanded PDF icon Agreement for Wastewater & Biosolids Services with Sussex County. Sussex County Council unanimously approved the Agreement for Wastewater & Biosolids Services at their meeting on August 8, 2017. Under the new agreement, the county will continue to pay the city to treat wastewater from surrounding areas of the county's sewer system. The county will be responsible for hauling via truck the city's biosolids to a new treatment plant at the county's Inland Bays facility. Fees will be determined once the new facility is operational, and the city will not have to contribute to operating costs until that time. Sussex County's contribution toward the $52.5 million outfall project will be based on utilization of services.

Construction work at the Wastewater Treatment Plant on the first bid package (T-1 Immediate Needs 1) will be wrapping up soon. The work includes demolishing remains of the existing steel roof on T-1, installing a new precast concrete roof deck, with concrete beams and columns for support, mobilizing a temporary roofing system while a new plank is fabricated, installing a new roofing membrane and skylights. The contractor, Allen Myers, is submitting shop drawings for review, finalizing their schedule and coordinating with subcontractors regarding the filter and clarifier equipment. The contractor will start demolition of clarifier and microscreen equipment in the next several weeks.  

New skylight at the WWTP

Announcement of Rehoboth Beach issuance of outfall permitting

On May 25, 2017, Delaware Department of Natural Resources and Environmental Control (DNREC) Secretary Shawn M. Garvin approved and signed the Secretary’s Order for the Rehoboth Beach ocean outfall which includes all required DNREC permits to move forward with construction. The U.S. Army Corps of Engineers will be issuing a permit along with a Sediment and Stormwater Permit from the Sussex Conservation District, and DelDOT permits for work on state road right-of-ways.

The approved pipeline alignment begins at the existing Rehoboth Beach Wastewater Treatment Plant, follows the Lewes and Rehoboth Canal north to Grove Park. The pipeline will then turn northeast to Henlopen Avenue and continue along Henlopen Avenue to the Deauville Beach parking area and terminate in the Atlantic Ocean, approximately 6,000 feet from the parking area. The 24-inch high-density polyethylene (HDPE) pipeline will be installed via horizontal direction drill approximately 3,000 feet and marine open-cut trench approximately 3,000 feet. Once the pipe is anchored in place with concrete collars, the open-cut trench will be backfilled. The terminus of the outfall pipe will consist of a 120 linear foot diffuser comprised of eight risers, 1.5 feet above the ocean floor, with four discharge ports per riser. The diffuser will be installed on pilings to ensure stability. Mobilization of equipment will tentatively begin October 1, 2017, and work is to be completed by April 30, 2018.

The Secretary's Order can be viewed at http://www.dnrec.delaware.gov/Info/Pages/SecOrders_Permits.aspx

Change Orders

Approved Permits

Bid Information

Contract Information

DNREC Workshop & Hearing

DNREC Public Workshop October 19, 2016
DNREC Public Hearing November 15, 2016

Frequently Asked Questions

FAQs regarding the Wastewater-Implementation of Ocean Outfall Alternative Discharge




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