Find & Apply For Water / Wastewater Engineer Jobs in Rexburg, Idaho

Water/Wastewater Project Engineer Apex Companies, LLC tuition assistance, 401(k) United States, Idaho, Rexburg Oct 29, 2026 Are you driven to grow, lead, and make a meaningful impact? At Apex, we're building more than a consulting and engineering firm-we're creating a place where your career accelerates, your contributions matter, and your potential is fully realized. We believe your growth is our growth, which is why we invest in your development at every stage of your career. Here, you'll work on projects that shape communities, protect the environment, and create lasting impact, all while being empowered with the autonomy and flexibility to do your best work. Fueled by high-quality delivery, exceptional client retention, and strategic acquisitions, Apex Companies continues to rank among the fastest-growing firms in the AEC industry, recently recognized by the Zweig Group for our industry-leading growth. Our success is grounded in strong leadership, a collaborative culture, and a shared commitment to delivering exceptional outcomes. As we continue to expand, we're looking for high-performing professionals who are ready to lead, collaborate, innovate, and create impact. At Apex, you help shape what's next. When we succeed together, we share in that success. All Apex positions are eligible for annual bonus opportunities, reinforcing our commitment to recognizing and rewarding meaningful contributions that drive our collective growth. This role is eligible for a $10,000 sign-on bonus, subject to the terms and conditions of the Company's sign-on bonus program. Your Responsibilities asa

Water/Wastewater Project Engineer:

As our Water/Wastewater Project Engineer, you will play a key role in the planning, design, and delivery of municipal water and wastewater infrastructure projects. Working alongside senior engineers and project managers, you will contribute to projects from initial planning and design through construction and startup while continuing to develop your technical and project management expertise. Design and support municipal water and wastewater infrastructure projects, including treatment facilities, pump stations, pipelines, storage facilities, and related systems.

Perform engineering calculations, hydraulic analyses, and evaluations to support planning, design, and operational improvements.

Prepare technical memoranda, engineering reports, calculations, construction drawings, specifications, permit applications, quantity takeoffs, and cost estimates.

Collaborate with multidisciplinary project teams to develop practical and cost-effective engineering solutions.

Support project management activities, including project schedules, budgets, resource coordination, and deliverables.

Work closely with clients, regulatory agencies, contractors, and other stakeholders throughout project development and execution.

Conduct field investigations, facility assessments, site visits, data collection, and system evaluations.

Provide construction administration support, including submittal reviews, responding to contractor inquiries, construction observation, and startupassistance.

Assistwith proposal development, scopes of work, project budgets, and schedules for new and existing clients.

Present technical findings and recommendations to clients, regulatory agencies, and project teams.

Support and mentor junior engineering staff while contributing to a collaborative and growth-oriented team environment. What we're looking for: Professional Engineer (PE) registration preferred, or ability to obtain Idaho licensure within 12 months.

5+ years of experience in water and wastewater engineering, infrastructure design, and project delivery.

Knowledge of water and wastewater treatment processes, collection and distribution systems, pump stations, and applicable regulatory requirements.

Experience supporting projects through planning, design, permitting, and construction phases.

Bachelor's degree in Civil, Environmental, Chemical, or related Engineering discipline.

Strong technical writing, communication, and client relationship skills.

Experience working within a consulting engineering environment is preferred.

Experience with hydraulic modeling, infrastructure master planning, treatment process evaluations, or facility assessments is a plus. Why you'll love working for us: Company-subsidized medical and dental.

Company-paid life, short, and long-term disability.

401k match, tuition assistance, and more.

Cross-training and the ability to work on a variety of projects.

Performance-based bonuses or other incentives.

Working with the best and brightest in the industry.

2,000+ employee national firm with 70+ locations across the US.

Apex Job Title:

Engineer 3 -

Sr Project Engineer Req ID:

11979 #LI-SH1 We believe in equality for all and celebrate the diversity and differences of our employees, customers, and communities. We do not discriminate based on gender, race or color, ethnicity or national origin, age, disability, religion, sexual orientation, gender identity or expression, veteran status, or any other applicable characteristics protected by law. Apex aims to make apexcos.com accessible to all users. If you have a disability or special need that requires accommodation to navigate our website or complete the application process, please contact Talent@apexcos.com or (301) 417-0200. Likewise, feel free to reach out to us if you would like to view or discuss Apex policy related to equal employment opportunity or have any related concerns. EO/AA/VEV/Disabled Employer

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