Principal Engineer / Sr. Principal Engineer - Water/Wastewater

Company: Hazen and Sawyer
Location: Fairfax
Posted on: February 15, 2026

Job Description:

Job Description Job Description Hazen is seeking a qualified and experienced Principal Engineer/Sr. 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 Key Responsibilities: Leading and delivering municipal water, wastewater, and stormwater facilities planning and design projects. Task responsibilities will include preparation of assessment and design reports, performing design calculations, equipment sizing/selection, preparation of construction documents, and support of construction management/commissioning needs. Field work and site visits from planning through construction and commissioning will be required. Required Qualifications: 5-7 years of water and wastewater conveyance and/or treatment design experience is required. Bachelor's degree in civil, mechanical, or environmental engineering is required. Preferred Qualifications: Experience in project management for smaller projects is preferred. Self-starter with attention to detail. PE License is required or ability to obtain licensure within one year. 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

Keywords: Hazen and Sawyer, Franconia , Principal Engineer / Sr. Principal Engineer - Water/Wastewater, Engineering , Fairfax, Virginia