Water Resources

Westport Wastewater Treatment Facility Expansion

The City of Port St. Lucie needed to expand the Westport Wastewater Treatment Facility due to significant population growth. The existing plant was permitted to treat a three-month average daily flow (TMADF) of 6.0 MGD. The facility expansion would increase the treatment capacity to an annual average daily flow (ADF) of 10.71 MGD (12.0 MGD TMADF).

CHA performed the preliminary and final design and will be performing bidding services during construction, and resident project representative (RPR) services. The preliminary design included hydraulic and biological modeling to establish existing operating conditions and determine the need for equalization storage for the anticipated peak inflows. The project is being executed in two phases. The first phase of the expansion project includes modifying critical plant process improvements and operational challenges. The second phase of the expansion includes additional modifications relating to existing plant processes and the expansion of the plant by the addition of new treatment trains.

Project summary


Expansion will be completed in two distinct stages.

12 mgd

Increased capacity – average daily flow will double to 12 mgd.


Expansion features 11 specific upgrades and modifications.

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Mark Worsham, PE*

Mark Worsham, PE*
Principal Engineer

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Mark has over 35 years of experience providing project and construction management for water system projects. His expertise lies in inspecting, designing, overseeing, testing, and commissioning building, mechanical, electrical, and instrumentation and control systems. He is also well-versed in hydraulic and water quality modeling, groundwater withdrawal and permit applications, feasibility and rates studies, and preliminary engineering reports.