Senior Process Engineer in Sarnia

What if you could redefine what’s possible? With us, you can. You want Purpose. Growth. Opportunity. People who get it. We are the home of ambitious, passionate, and innovative world shapers. With an unmatched breadth and depth of engineering, advisory and science-based expertise, our global minds unite to power local solutions. We are pathfinders and impact makers.

The Opportunity

Build the Future With Us. Bring your technical leadership to projects that improve the performance, reliability, and sustainability of municipal wastewater treatment infrastructure. As a Senior Process Engineer – Wastewater Treatment, you will lead the planning, evaluation, design, commissioning, and optimization of municipal treatment facilities. You will combine strong process engineering fundamentals with practical operational knowledge and sound engineering judgment to develop effective solutions, resolve complex process challenges, and guide multidisciplinary teams through all stages of project delivery.

Your Impact

• Lead process design, capacity assessments, facility optimization, and treatment-alternative evaluations for municipal wastewater infrastructure.
• Develop design criteria, mass balances, process calculations, hydraulic assessments, and equipment sizing to support informed technical and investment decisions.
• Design biological, physical and chemical, nutrient-removal, tertiary-treatment, and solids-processing systems that respond to clients’ operational and regulatory needs.
• Apply and review process models using tools such as GPS-X, BioWin, SUMO, and Visual Hydraulics to assess alternatives, troubleshoot complex issues, and optimize treatment performance.
• Review process flow diagrams, P&IDs, calculations, specifications, equipment selections, and technical reports to uphold quality and consistency across project deliverables.
• Lead technical workshops and clearly communicate recommendations to clients, operators, vendors, and multidisciplinary design teams.
• Guide permitting, contract administration, commissioning, and construction-support activities throughout the project lifecycle.
• Strengthen our technical community by providing QA/QC, mentoring junior and intermediate engineers, leading proposals, and supporting trusted client relationships.

The Skills That Set You Apart

• A bachelor’s degree in Chemical, Environmental, Mechanical, or a related engineering discipline; a master’s or doctoral degree is considered an asset.
• At least 10 years of progressive water or wastewater process engineering experience, including conventional and advanced treatment processes.
• A Professional Engineer designation and the ability to apply sound engineering judgment to complex technical assignments.
• Demonstrated experience in process design, modelling, optimization, equipment evaluation, and equipment selection.
• Strong knowledge of process controls, instrumentation, plant operations, commissioning, permitting, contract administration, and construction-support services.
• Proven ability to independently lead technical work, complex proposals, and multidisciplinary project teams in a consulting environment.
• Strong technical writing, presentation, client communication, proposal-development, and problem-solving skills.
• A valid driver’s licence and willingness to travel periodically to client sites and project locations.

Why Choose WSP?

We exist to shape communities to advance humanity. The brightest engineers, advisors and scientists from across the globe call WSP home. Proudly Canadian – we are a Top 100 Employer in Canada for 2026. Global community of brilliant minds – your next idea, mentor, or opportunity is always within reach. Limitless opportunities start here. Whether it’s across the country or around the globe, we help you tailor your role to match your ambition — because your growth drives ours. Flexible work, real balance – we recognize the importance of balance in our lives and encourage you to prioritize the balance in yours.

Compensation AB, BC, NT, NU, SK & YT: $162,200 - $212,200 MB & ON: $148,000 - $198,000 NB, NL, NS, PE & QC: $146,500 - $194,600. The final salary awarded for this role may vary from the above range based on several factors including, but not limited to, relevant education, qualifications, certifications, experience, skills, seniority, geographic location, performance, and business or organizational needs.

Make Your Mark with WSP. Turn your process engineering expertise into treatment solutions that deliver lasting value for clients, operators, and communities. Join a collaborative team where you can lead complex technical work, develop the next generation of professionals, and help shape the future of municipal wastewater infrastructure.

Please Note: Health and Safety is a core paramount value of WSP. Given the importance of keeping one another safe it is expected that you comply with our Health, Safety & Environment (HSE) policy at all times as well as client HSE policies when working at client locations. WSP welcomes and encourages applications from people with disabilities. Accommodations are available on request for candidates taking part in all aspects of the selection process. WSP is committed to the principles of employment equity. Only the candidates selected will be contacted. WSP does not accept unsolicited resumes from agencies.