Senior Water/Wastewater Engineer

At Mott MacDonald, we are driven by purpose and powered by brilliant people. As a trusted engineering, management, and development consultancy, we work with clients to solve complex challenges and deliver sustainable outcomes that make a meaningful difference for the communities we serve.

When you join us as an experienced professional, you will bring your expertise to work that matters while continuing to grow your career. You will collaborate with talented colleagues across disciplines and geographies, contribute your perspective, and help shape better outcomes through technical excellence, innovation, and integrity.

Build on your experience while helping shape what comes next. At Mott MacDonald, you'll work alongside talented people on complex and rewarding projects that make a real difference. We value fresh perspectives, encourage collaboration, and provide opportunities to expand your skills, take on new challenges, and grow your career. Whether you're deepening your technical expertise, broadening your leadership experience, or exploring new opportunities across our business, you'll be supported by a team that is committed to helping you succeed.

We are seeking a Senior Wastewater Engineer to strengthen our regional water team across New York, New Jersey, Pennsylvania and Massachusetts. This role will focus primarily on municipal wastewater treatment, with additional responsibility for collection and conveyance projects.

The successful candidate will serve as a senior technical contributor and project delivery lead, working alongside regional wastewater leadership to plan, design and deliver new facilities and upgrades from initial studies through construction.

Key responsibilities include:

• Lead wastewater treatment planning, process evaluations and facility designs.
• Develop design criteria, calculations, hydraulic profiles, mass balances, equipment sizing and facility layouts.
• Design and evaluate headworks, primary and biological treatment, nutrient removal, clarification, disinfection, biosolids management, chemical feed systems and ancillary systems.
• Support sanitary sewer, force main, pump station, inflow and infiltration, and wet-weather management projects.
• Prepare and review technical reports, drawings, specifications, cost estimates and bid documents.
• Manage technical tasks, project scope, schedules, budgets and multidisciplinary coordination.
• Provide construction-phase support, including submittal reviews, RFIs, field coordination, commissioning and operational troubleshooting.
• Mentor junior staff and provide technical quality assurance.
• Build client relationships and support proposals, interviews and regional business development.

We invite application from candidates with the following experience:

• Bachelor’s degree in civil, environmental, chemical or related engineering.
• Typically, 10–15 years of progressively responsible wastewater engineering experience.
• Strong municipal wastewater treatment process design experience.
• Working knowledge of wastewater collection, conveyance and pumping systems.
• Experience delivering projects from planning and design through construction.
• Demonstrated ability to lead technical teams and communicate effectively with clients and treatment plant operators.
• Professional Engineer license in at least one US jurisdiction, with the ability to obtain licensure in New York, New Jersey, Pennsylvania and Massachusetts.
• Ability to travel to clients and project sites throughout the region.
• Preferred experience

• • Activated sludge and biological nutrient removal.
  • Plant hydraulics, wet-weather treatment and solids handling.
  • Advanced treatment, membranes, intensification processes, water reuse or industrial wastewater.
  • Plant commissioning, start-up and operational troubleshooting.
  • Public-sector wastewater projects in New York, New Jersey or Pennsylvania.
  • Proposal development, client management and staff mentoring.

What success looks like

The successful candidate will become a trusted senior technical resource, take ownership of wastewater projects and select project-management assignments, support the development of junior staff, and help expand our regional wastewater capabilities.

Bring your expertise, curiosity, and drive to make a difference. If you are ready to join a collaborative consultancy where your perspective is valued, your growth is supported, and you are empowered to lead with integrity, we would love to hear from you.

Benefits & Rewards

The expected salary for this position in MA is $149000 - $182000

The expected salary for this position in NY is $152000 - $186000

The expected salary for this position in NJ is $143000 - $175000

Individual pay is determined based on several factors such as work location, education, experience, and unique skills.

In addition to base salary, Mott MacDonald offers performance-based bonuses and a comprehensive benefits package, giving employees a direct connection to our success.

Our comprehensive benefits package is designed to support the health, wellbeing, financial security, and professional growth of our employees. Eligible employees have access to medical, dental, and vision coverage, FSA and HSA accounts, company-paid life insurance, short-term and long-term disability coverage, and a competitive 401(k) plan with company matching. We also provide paid time off, paid holidays, caregiver leave, employee referral bonuses, professional registration and membership reimbursements, and tuition assistance to support continued learning and career development.

Collaboration at Our Core

At Mott MacDonald, we believe great ideas happen when we're together. Our hybrid approach centers on an in-office culture, with most of your time spent collaborating face-to-face and a minimum of three days per week in the office. We balance flexibility with connection, so you and your manager can choose how to meet clients, team, and personal commitments.

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.