With experience on numerous projects involving wastewater conveyance and treatment systems in the Northwest, our engineers provide wastewater characterization, process evaluation, facility planning, system design, contract document preparation, project management, and construction phase assistance from contract administration to inspection.

Our conveyance and pump station experience includes service area planning, system evaluation and modeling, inflow and infiltration studies, and design of gravity sewers, pumping stations, force mains, and related hydraulic structures. Herrera provides civil, mechanical, process, electrical, and instrumentation and control engineering for pump stations from project planning through construction and startup. Herrera engineers have designed pump stations for facilities ranging from 7 mgd to 230 mgd.

Key Projects

• Sweyolocken Pump Station Upgrade – King County
• North Creek Pump Station and Storage Facility – King County
• North Beach Pump Station Replacement Preliminary Design – King County
• Lakeland Hills Pump Station Evaluation and Design – King County
• Cedar Hills Regional Landfill Pump Station and Conveyance Improvements – King County
• Value Engineering Session for the Soos Creek Pump Station – King County
• Pullen Creek Fish Passage and Restoration Design Project – Taiya Inlet Watershed Council