Principal Project Manager - Water/ Wastewater

Mott MacDonald
life insurance, vision insurance, parental leave, paid holidays, 401(k)
United States, Washington, Seattle
1601 5th Avenue (Show on map)
Jan 02, 2026
At Mott MacDonald, we trust our brilliant people to do brilliant things in engineering, management, and development services, supporting multisector project work in over 150 countries. As one of the largest employee-owned companies in the world, we pride ourselves on our ability to deliver exceptional outcomes through our network of 20,000+ talented consultants. With sustainability and innovation at the heart of all our sectors in North America, including, Buildings, Energy, Transportation, and Water. We believe in empowering our people to excel, learn, and grow, offering diverse opportunities to contribute to career-defining work. Join us and be part of a collaborative environment where your ambitions are united with ours, and you can truly shape your story. We are seeking a highly motivated and experienced Principal Engineer (Design Manager) to provide strategic and technical leadership on Combined Sewer Overflow (CSO) and wastewater conveyance programs across the Puget Sound region. This is a high-impact role leading complex, multidisciplinary projects; supporting key pursuits and delivery strategy; and strengthening long-term partnerships with major utilities and public agencies. You'll collaborate across our North American network working with highly talented local team focused on resilient, sustainable wetweather solutions. Role & Responsibilities: Serve as Technical Principal/Design Manager for large CSO tunnels, gravity/pressure conveyance, pump stations, and related assets from planning through construction support. Establish project governance (scope, schedule, budget, risk, change control) and ensure safetyindesign and quality management (QA/QC) throughout delivery. Direct planning studies, alternatives analyses, feasibility assessments, and basis-of-design documentation. Oversee hydraulic modeling, surge/transient analyses, and capacity planning; guide trenchless technology selection and constructability. Lead preparation of drawings, specifications, technical reports, and cost estimates; support procurement and construction-phase engineering (RFIs, submittals, field support). Act as Project Principal building and maintaining executive-level client relationships, supporting the development of account plans and program roadmaps. Champion BIM and model-based coordination; promote data-driven decision-making, carbon-aware design, and sustainability/resilience best practices. Mentor and develop multi-disciplinary teams; foster an inclusive, highperformance culture; support recruitment and succession planning. Coordinate with tunneling, geotechnical, structural, and environmental specialists across offices; occasional regional travel as needed. Candidate Qualifications: Bachelor's degree in Civil, Environmental, or Water Resources Engineering (Master's preferred). Professional Engineer (PE), Washington 15+ years in water/wastewater infrastructure with substantive experience delivering CSO and wastewater conveyance projects. Demonstrated success leading large, multidisciplinary teams across planning, design, procurement, and construction support. Proficiency in wastewater hydraulics, pump station design, trenchless methods and construction-phase engineering. Competence with scheduling, budgeting, risk management, change control, and quality systems. Strong written/oral communication; skilled in client-facing presentations and stakeholder engagement. Preferred Qualifications Prior work with Seattle-area agencies and counties, including Seattle Public Utilities (SPU), King County Wastewater Treatment Division (WTD), City of Tacoma Environmental Services, Pierce County Sewer Utility Familiarity with Puget Sound regional standards, permitting, and delivery methods (progressive DB, CM/GC, DBB). Experience addressing wetweather/consent decree drivers, system resilience, and environmental compliance. Working knowledge of BIM and common hydraulic modeling tools; commitment to digital delivery and sustainability practices. Our teams are comprised of bright and enthusiastic people who wish to make a difference to the world that we live in. If you share that vision and don't have all the experience outlined in this posting, we still want to hear from you! Let's discuss how we can help you take the next step in your career and how you can participate in an exciting new chapter for Mott MacDonald in North America. At Mott MacDonald, we provide a comprehensive benefit package that includes 401k, medical, dental and vision insurance, short-term/long-term disability, paid holidays, PTO, parental leave and company paid life insurance. The expected salary for this position is $181,000 - $221,000 Individual pay is determined based on several factors such as work location, education, experience, and unique skills. Equal opportunity is the law. We seek to promote fair employment procedures and practices to ensure equal opportunities for all. We encourage individual expression in our workplace and are committed to creating an inclusive environment where everyone feels they have the opportunity to contribute. Englishversion Spanishversion Chineseversion All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, protected veteran status, creed, marital status, sexual orientation, gender identity, citizenship status or disability status. Hybrid working policy At Mott MacDonald, we believe it makes business sense for you and your manager to choose how you can work most effectively to meet your client, team, and personal commitments. We offer a hybrid working policy that embraces your well-being, flexibility, and trust.