Romtec Utilities designed, prefabricated, and delivered a complete residential wastewater lift station for Village at 47th, a senior apartment development in Tukwila, Washington. The project required a reliable sewer pumping system that could meet City of Tukwila standards and keep the construction schedule moving.

Tukwila is located in King County, just south of Seattle, with strong access to Interstate 5, Interstate 405, Seattle-Tacoma International Airport, and regional transit. The city serves both residents and a much larger daily workforce, making dependable public infrastructure an important part of local growth.

The Southcenter and Tukwila Urban Center area has been planned for higher-density, mixed-use development with more housing, jobs, and pedestrian-friendly spaces. As new residential projects are built, wastewater infrastructure must be ready to serve higher flows while meeting local review standards.

Village at 47th includes a 272-unit senior apartment complex. Because the site needed to move wastewater from the development into the public sewer system, the project required a sewer lift station that could handle current demand and allow room for future needs.

A wastewater lift station is used when gravity alone cannot move sewage to the next point in the sewer system. Pumps collect wastewater in a wet well and push it through a force main to a higher elevation or connection point. For large residential developments, this type of system helps protect public health, reduce sewer backups, and keep wastewater service dependable for residents.

Romtec Utilities supplied a complete wastewater lift station system engineered for durability, reliability, and easy maintenance. The system was designed as a municipal-grade solution with the controls, pumps, structures, and backup level sensing needed for long-term operation.

The system includes:

• Precast wet well: 8-foot inside diameter and 11.5-foot depth
• Precast valve vault: Model 687 configuration
• Pumps: Duplex 5-horsepower Ebara submersible pumps
• Primary controller: Romtec Utilities control panel with programmable logic controller for advanced control and monitoring
• Primary level sensing: Keller submersible pressure transducer
• Backup level sensing: Three Gems M-Series float switches
• Enclosure: National Electrical Manufacturers Association Type 4 painted steel enclosure
• Duty point: 195 gallons per minute at 42 feet of total dynamic head

Each component was selected to meet the needs of a publicly owned lift station. The duplex pump design provides redundancy, so one pump can continue operating if the other requires service. The control and monitoring equipment also helps operators manage the station and respond to changing flow conditions.

This project presented several important challenges early in the design process. The City of Tukwila required a municipal-grade wastewater lift station with long-term reliability, redundancy, and maintainability. The original lift station concept was a prefabricated packaged system, but it did not meet the standards required for a publicly owned system.

Submittals were a critical part of the construction schedule. Any delay in lift station approval could have slowed other site work for the senior apartment development. The project team needed an engineered system that met municipal requirements and could move through review quickly.

Romtec Utilities worked with the civil engineer, general contractor, and project stakeholders to develop a compliant lift station design. The engineering process focused on clear communication, fast submittals, and a system layout that matched the City of Tukwila’s expectations for public operation.

• Rapid development of compliant design submittals
• Coordination with the civil engineer and project stakeholders
• A system designed for municipal ownership and maintenance
• Capacity for current wastewater flows and future demand

The final wastewater lift station design was efficient, straightforward, and built around proven equipment. By providing a completely prefabricated system, Romtec Utilities helped reduce onsite construction complexity and supported the project schedule from engineering through delivery.

Romtec Utilities coordinated closely with the project team to align manufacturing and delivery with construction milestones. The prefabricated wet well, valve vault, pumps, controls, and related equipment were produced to specification and delivered ready for installation.

Key project stakeholders included:

End owner and reviewer: City of Tukwila
Project owner: Vintage Housing
Civil engineer: Pacland
General contractor: ACG Builds
Remote monitoring integrator: Calvert Technologies

Romtec Utilities was brought into the project after the first concept did not meet public ownership requirements. With approvals and timelines at risk, Romtec Utilities worked with Pacland and ACG Builds to create a compliant, engineered solution and deliver the needed submittals quickly.

At startup, the wastewater lift station was designed to connect with the remote monitoring system provided by Calvert Technologies. Romtec Utilities made sure the controls, instrumentation, and pumps were compatible with the monitoring and operating needs of the public system.

The Village at 47th project shows how Romtec Utilities supports residential growth with reliable wastewater infrastructure. By designing and delivering a complete wastewater lift station for Tukwila, Washington, Romtec Utilities helped the project team meet municipal standards, protect the construction schedule, and provide long-term value for the community.

Need a wastewater lift station for a municipal, residential, or mixed-use development? Contact Romtec Utilities to discuss a completely prefabricated pump station solution designed for your project requirements.