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Principal Engineer

Hazen and Sawyer
Fairfax, VA Full Time
POSTED ON 5/23/2026
AVAILABLE BEFORE 6/22/2026

Hazen and Sawyer is seeking a Principal Engineer for our Fairfax, VA office.

Why Hazen and Sawyer:

  • Founded in 1951 by the son of Allen Hazen (developer of the Hazen-Williams equation), we are an employee-owned company with a singular focus on "all things water."
  • Our work includes planning, design, and oversight of construction of environmental infrastructure – for water, wastewater, and stormwater management.
  • We foster a work environment low on bureaucracy and high in creativity.
  • We recruit talented professionals, provide them with challenging, interesting, and creative assignments, and furnish them with the tools they need to succeed.
  • We currently have over 2,000 employees in 70 offices throughout the United States, Latin America, Canada, and the UK.
  • A flexible hybrid work schedule supports today's busy professionals. 

Key Responsibilities:

  • Delivering public sector water and wastewater facilities planning and design projects
  • Support projects as a critical part of the design team, a design lead, a task manager, and/or a project manager
  • Prepare facility assessment and design reports
  • Perform design calculations, perform process and/or hydraulic modeling, select and size equipment, prepare design documents and construction documents, support construction phase services both in office and in the field
  • Field work and site visits from planning through construction may require occasional travel. You will support and mentor junior engineers and will be supported by multiple senior mentors on projects and local and regional office leadership

Required Qualifications:

  • Bachelor of Science degree in Civil, Environmental, Chemical, or Mechanical Engineering
  • Strong verbal and written communication skills
  • PE license (Virginia, or ability to be licensed in Virginia via comity)
  • Minimum of 1 year following PE licensure of documented design experience for water/wastewater facilities projects
  • Experience working on and collaborating with multidisciplinary teams 
  • Experience supervising, coordinating and reviewing work by junior and technical staff
  • Ability to estimate workload and develop schedules
  • Proficient in standard software platforms (e.g., Microsoft Office Suite, etc.)
  • Strong organizational skills

Preferred Qualifications:

  • Master of Science degree in Civil Engineering, Environmental Engineering or Construction Management  
  • Experience serving as Project Manager for water/wastewater facility projects
  • Experience supporting proposal preparation and participating in interviews
  • Experience communicating and coordinating with clients
  • Experience mentoring junior and technical staff
  • Experience delivering water and/or wastewater facility projects from preliminary design through construction
  • Familiarity with CADD, GIS, Revit, and/or other software

What We Offer:

  • Comprehensive health benefits (medical, dental, vision, and prescription plans)
  • Pre-tax flexible spending plans for medical, dependent care, and transportation
  • Short and long-term disability, and employer paid life insurance
  • Paid holidays, floating holidays, and paid time off (PTO)
  • Employer-contributed 401(k) plan and additional financial planning support
  • Professional growth opportunities, including tuition reimbursement, in-house training, and incentives for professional registration and professional organization memberships
  • Starting pay range for this position depends on skills, experience, education and geographical location



Salary.com Estimation for Principal Engineer in Fairfax, VA
$213,756 to $256,907
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