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Project Overview


Built-in 1952, the Southeast Treatment Plant (SEP) is San Francisco’s largest wastewater facility and treats 80% of the City’s sewage and stormwater flows. Many of the existing SEP solids treatment facilities are over 60 years old, require significant maintenance, and are operating well beyond their useful life.


To ensure our sewer system continues to provide sustainable and reliable operations, we are committed to upgrading our largest and oldest treatment facility. The Biosolids Digester Facilities Project (BDFP) will replace and relocate the outdated existing solids treatment facilities with more reliable, efficient, and modern technologies and facilities that will help transform the SEP into a modern resource recovery facility, a proud neighborhood asset, and an attractive workplace. The new facilities will produce higher-quality biosolids, capture and treat odors more effectively, and maximize biogas utilization. In addition, the project will locate the digesters farther away from existing residences and make visual improvements in and around the SEP.


Please visit the SFPUC's Biosolids Digester Facilities Project page to learn more about the project.


Subcontractors are invited to prequalify and bid through a public bidding process following project-specific ordinances. The CM/GC will award trade contracts to pre-qualified bidders submitting the lowest responsive bid. For more information, please refer to our Bidding Opportunities page. ​



The City and County of San Francisco, acting through the General Manager of the San Francisco Public Utilities Commission (SFPUC), has engaged MWH/Webcor JV to construct a facility within the wider Biosolids Digester Facilities Project. This facility comprises the Digester Building (B610) and some limited adjacent structures.

Scope of Work includes the following components:

  • Civil:  Below-grade yard piping, drainage, paving, waterproofing.

  • Architectural:  Building finishes, EIFS, building envelope, coatings.

  • Structural:  CIP concrete, steel, miscellaneous metals, prestressed tanks, access walkways and stairs.

  • Mechanical:  process piping, supports, equipment installation.

  • Electrical:  Switchgear, MCC’s conduit and raceways with cabling for MV and LV installations.

  • Process equipment associated with the wastewater treatment process.

  • Controls:  DCS, PCIS, Instrumentations, Integration.

  • Building Services:  HVAC, security, lighting, fire detection, fire suppression.

  • Opportunities for support services during day-to-day construction activities.

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