STP Operator (Unionized) at Aecon

Come Build Your Career at Aecon!

Aecon delivers some of the most complex and impactful infrastructure projects - from transformative transportation networks to critical energy, industrial and nuclear programs. The projects we build connect communities and power future generations. With deep roots in North America and a strong footprint internationally, Aecon brings global expertise and proudly serves public and private sector clients through its Construction and Concessions segment.

Safety Always is not only our #1 core value - it is the standard that anchors our culture. We believe the most ambitious projects deserve the most committed people. At Aecon, you won't just build your career - you'll help build what matters to enable future generations to thrive.

At Aecon, you can count on:

• Safety Always. Our number one core value. The safety of our people, projects, partners, and stakeholders is our priority focus - today and always.
• Integrity. We lead by example, with humility and courage.
• Accountability. We're passionate about delivering on our commitments.
• Inclusion. We provide opportunities where people feel valued, supported, and empowered to contribute fully.

We deliver infrastructure with purpose, and our people are at the heart of everything we do. Aecon employees are incredibly proud to build some of the most impactful infrastructure of this generation - we call it Aecon Proud .

At Aecon we:

• Ensure you and your family receive the services and benefits needed to support your mental, emotional, and physical well-being.
• Are intentional when it comes to investing in your development. We help you build your career and advance your skills through our Aecon University, tuition reimbursement, and Leadership Programs.
• Are committed to creating work environments focused on mutual respect, teamwork, collaboration, and new ideas, through meaningful initiatives, training, partnerships with Veteran groups, our Aecon Women in Trades and diversity programs, as well as our Employee Resource Groups (ERGs) , to ensure we are building with top talent and harnessing our collective strengths within every aspect of our culture.
• Operate responsibly by managing risk, safety, and environmental considerations across all our projects and surrounding communities.

Our success is built on the passion, expertise, and dedication of our people. Together, we embrace strong execution, innovation, and continuous improvement - values that come to life through the unique talents and collaborative spirit of every team member. If you're inspired to make a difference through future-building projects, join our best-in-class team.

What is the Opportunity?

As part of an alliance agreement, Aecon has been awarded a contract in an Aecon-led partnership with Kiewit Nuclear Canada by Ontario Power Generation (OPG) for the execution phase on the Darlington New Nuclear Project (DNNP) in Clarington, Ontario. In 2025, Aecon began the Construction of the Unit 1 Small Modular Reactor at the Darlington site. 

Job Summary

The STP Operator is responsible for operating and monitoring the Separation & Treatment Plant to efficiently separate solids, oil, and contaminants from wastewater generated during construction and tunnelling activities. The role ensures safe operation, environmental compliance, and continuous plant availability to support site operations.

Key Responsibilities - Plant Operation

• Operate and monitor separation and treatment units including settling tanks, separators, hydrocyclones, clarifiers, oil-water separators, and chemical dosing systems.
• Control pumps, valves, mixers, and conveyors to maintain steady plant throughput.
• Adjust flow rates, pressures, and dosing to optimize separation efficiency.

Monitoring & Quality Control

• Monitor inlet and outlet water quality (pH, turbidity, suspended solids, oil content).
• Take routine samples and maintain operational logs.
• Ensure treated water meets discharge or reuse requirements.

Solids & Waste Handling

• Manage sludge, separated solids, and oil waste.
• Operate dewatering units and monitor cake quality.
• Coordinate waste disposal as per environmental regulations.

Health, Safety & Environment (HSE)

• Follow all site safety and environmental procedures.
• Handle chemicals safely using proper PPE.
• Prevent spills, overflows, and environmental incidents.

Reporting & Coordination

• Report daily operations, downtime, and issues to the Supervisor.
• Coordinate with TBM, slurry, dewatering, and site teams.
• Support inspections by the client or authorities.

Reason for vacancy: Evergreen

Pay Range:

Per the HCAT Collective Agreement:

Effective May 1, 2025: $51,44/hr

Effective May 1, 2026: $52.80/hr

Effective May 1, 2026 $54.39/hr

We strongly encourage applicants who identify as Indigenous to apply to work with us on the Darlington New Nuclear Project. At Aecon, Indigenous is an umbrella term for First Nations (status and non-status), Metis and Inuit. 

Aecon fosters diversity, inclusion and belonging within and across our organization. We welcome all to apply including, women, visible minorities, Indigenous peoples, persons with disabilities, and persons of any sexual orientation or gender identity.

We are committed to adhering to the objectives and requirements outlined in the Accessible Canada Act (ACA), and to meeting the accessibility needs of persons with disabilities in a timely manner. Through the implementation of the requirements of the ACA and its applicable regulations, appropriate accommodations will be provided upon request throughout the interview and hiring process.

As part of our commitment to fair and transparent hiring practices, Aecon may use artificial intelligence (AI) tools to assist in screening and reviewing candidates. These tools are applied responsibly and in accordance with applicable privacy laws and Aecon's AI Usage Policy. All final decisions are made by qualified Aecon team members.