Project Engineer - Mechanical

Current job opportunities are posted here as they become available.

MWH is a leading water and wastewater treatment-focused general contractor in the US with a rich history dating back to the 19th century. Fueled by the mission of Building a Better World
, our teams are rapidly growing across the nation.

As a company committed to our team's well-being and growth, we offer a supportive work environment, opportunities for advancement, and the chance to contribute to a mission that shapes the future. Your expertise and ambition are valued here.

The work we do matters. The critical systems infrastructure we build changes lives, betters communities, and improves ecosystems. If you’re passionate about this, we want to hear from you!

MWH is currently seeking a qualified Project Engineer to support the mechanical scope of work on a critical water treatment plant construction project in Gresham, Oregon.

The Project Engineer – Mechanical supports the planning, coordination, and execution of a defined mechanical construction package on a water treatment plant (WTP) project. This role focuses on process piping, mechanical equipment installation, subcontractor coordination, and commissioning support, critical to treatment plant operations.
The Project Engineer works closely with the Project Manager, Superintendent, mechanical subcontractors, engineers, inspectors, and owner representatives to ensure work is completed safely, in compliance with contract documents, and aligned with project schedule and budget.

A typical mechanical scope may include, but is not limited to:

• Pumps, blowers, mixers, and treatment process equipment
• Chemical feed systems and storage equipment
• HVAC systems serving treatment facilities
• Mechanical equipment installation, alignment, and testing

• Support planning, coordination, and execution of the mechanical package
• Assist with RFIs, submittals, shop drawings, O&M manuals, and as-built documentation.
• Coordinate daily activities of mechanical subcontractors with field supervision.
• Track quantities, production, and installation progress. Support inspections, testing, and quality control documentation.
• Assist with procurement of mechanical equipment and tracking of long-lead items.
• Support cost tracking, forecasting, and change management activities.
• Participate in startup, commissioning, and system turnover activities.
• Promote(worksite) safety and compliance with project safety plans.

• 2–6 years of experience as a Project Engineer, Field Engineer, or similar role.
• Experience supporting mechanical scopes on water or wastewater treatment facilities.
• Ability to read and interpret mechanical drawings, P&IDs, isometrics, and specifications.
• Familiarity with pumps, valves, piping systems, and treatment process equipment.
• Basic understanding of commissioning, testing, and system turnover.
• Working knowledge of construction cost control and change management.

• Bachelor’s degree in Construction Management, Mechanical Engineering, or related field (Equivalent field experience may be considered in lieu of degree)
• Strong organizational and documentation skills.
• Effective communication with field crews, subcontractors, and engineers.
• Detail-oriented with strong follow‑through.
• Ability to manage multiple priorities in an active treatment plant environment.
• Proficiency in Microsoft Office; experience with CMiC, Procore, Bluebeam, or similar systems preferred.
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• Group health & wellness benefits including options for medical, dental and vision.
• 100% Company Paid Benefits:
  Employee Life Insurance & Accidental Death & Dismemberment (AD&D), Spouse and Dependent Life & AD&D, Short Term Disability (STD), Long Term Disability (LTD), Employee Assistance Program and Health Advocate.
• Voluntary benefits at discounted group rates for accidents, critical illness, and hospital indemnity.
• Flexible Time Off Program (includes vacation and personal time).
• Paid Sick and Safe Leave.
• Paid Parental Leave Program.
• 10 Paid Holidays.
• 401(k) Plan (company matching contributions up to 4%).
• Employee Referral Program.

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