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Mott MacDonald • Seattle, WA, US

Principal Project Manager - Water/ Wastewater

Salary:  £181,000 – £221,000 per annum
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Job Description

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.

NASA is seeking a dynamic, highly motivated, and experienced Team Leader with at least 20 years of experience in water and wastewater infrastructure projects to join our Seattle, WA office. In this role, you will serve as the Principal on large, complex projects, lead the technical development of proposals and build a local team.

The position offers excellent potential for professional growth and the opportunity to collaborate not only with water resources personnel, but with our many practices including tunnelling, dams, geotechnical, energy, and transportation. The qualified candidate must have strong leadership and program management experience and direct business development experience during their career, with the ability to generate project leads, build client relationships, and win work.

Responsibilities are as follows:

  • Serve as project manager on large and complex projects with multi-discipline project teams
  • Serve as project principal, supervising less experienced project managers on smaller less complex projects
  • Supervise and direct preparation of planning studies, evaluations, and feasibility studies for water, wastewater and stormwater infrastructure projects
  • Supervise and direct preparation of plans and specifications for new facilities and rehabilitation of existing facilities
  • Supervise and direct construction engineering support services.
  • Lead the technical development of proposals
  • Serve as account leader responsible for creating and growing relationships with one or more clients

We invite applications from candidates with the following experience:

  • Bachelor’s Degree in Engineering (Civil, Mechanical, Environmental or similar)
  • Licensed as a Professional Engineer in Washington
  • 20+ years total experience in planning, design, and construction management of water, and wastewater infrastructure projects for major utility clients
  • Experience with large Washington state utilities in the Pacific NW including King County Wastewater Treatment Division (WTD), Seattle Public Utilities (SPU) is preferred, but not required
  • Strong technical skills and technical leadership experience, preferably including water/wastewater conveyance and/or treatment systems
  • 5+ years experience in managing multi-discipline project teams
  • 5+ years experience in managing proposals for engineering projects
  • Experience in managing and growing client relationships.

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.


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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.

Company benefits

Open to part-time employees
Open to part time work for some roles
Enhanced maternity leave – 26 weeks full pay
Adoption leave – 26 weeks full pay
Shared parental leave – We match up to 24 weeks full pay
Enhanced paternity leave – 2 weeks
Private GP service – Private Medical care for all UK staff
Life insurance – 4 x salary
Enhanced pension match/contribution – matched up to 7%
Buddy scheme
Enhanced sick pay
Dental coverage
Compassionate leave
Health assessment
Eye Care Support – Eyecare vouchers
Life assurance
Carer’s leave – up to 5 days, two of which are paid
Pregnancy loss leave
Salary sacrifice
Buy or sell annual leave
Accrued annual leave
Religious celebration leave
Tax-free childcare
Theme park discounts
On-site yoga classes
Cycle to work scheme
Faith rooms
Annual pay rises
Annual bonus
Income protection
Employee discounts
Professional subscriptions – We pay for your primary professional annual subscription
Lunch and learns
Employee assistance programme
L&D budget
Teambuilding days
Travel loan
Returnship
Mentoring
In house training
Study support
Learning platform
Further education support

Working at Mott MacDonald

Company employees

18,000 worldwide

Gender diversity (male:female)

65:35

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Awards & Accreditations

2nd – Career Progression

2nd – Career Progression

Flexa awards 2025
3rd – Family Friendly

3rd – Family Friendly

Flexa awards 2025
Work-Life Balance

Work-Life Balance

Flexa awards 2025
Flexible

Flexible

Flexa awards 2025
Culture

Culture

Flexa awards 2025

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