ISG

Multidisciplinary employee-owned design and consulting firm

Industrial Water/Wastewater Engineer

Water Resources EngineeringUpdated on Nov 13

Full-timeSioux Falls, SD, USA$70k - $125k /yrIn-person

About the Job

Requirements

Have 2–4 years of relevant experience in industrial or water/wastewater process design.
Demonstrate critical thinking and the ability to tailor process designs to unique process conditions.
Validate engineering results for physical and logical reasonableness, including mass and flow balances.
Be organized, data-oriented, and proficient with Excel and engineering calculation tools.
Communicate clearly and concisely with clients and internal teams, work independently, and proactively seek guidance when needed.
Hold or be progressing toward PE or EIT certification or PE licensure.
Have experience with industrial sectors such as food and beverage, dairy, agriprocessing, or manufacturing.
Be familiar with process modeling tools and developing PFDs/P&IDs.
Have experience presenting at or attending industry and technical conferences and interest in publishing or presenting technical content.
Have membership or engagement with professional organizations such as WEF, AWWA, or Water Environment Federation chapters.

Responsibilities

Develop process designs and perform detailed calculations, including mass balances, hydraulic profiles, equipment sizing, and process modeling, for industrial water/wastewater treatment, reuse, and related systems.
Analyze influent and effluent variability and site-specific conditions to create client-specific solutions.
Manage multiple fast-moving industrial projects with clear priorities, organized workflows, and proactive communication.
Produce PFDs/P&IDs, specifications, reports, and QA/QC checklists, coordinating with multidisciplinary teams and vendors.
Support site visits, pilot testing, startups and commissioning, and operator training as needed.
Structure and interpret data to inform design decisions and validate results using practical judgment.
Contribute to internal knowledge-sharing, present or co-author technical papers, and represent the firm at industry and technical conferences.
Work independently when appropriate, seek guidance and resources when needed, and help grow the intern program and early-career staff.

Desired Qualifications

A B.S. in Chemical Engineering or Environmental Engineering; strong process-focused candidates from related disciplines may also be considered.
Experience with industrial sectors such as food and beverage, dairy, agriprocessing, or manufacturing.
Familiarity with process modeling tools and developing PFDs/P&IDs.
Experience presenting at or attending industry and technical conferences, such as WEFTEC or Water Reuse, and interest in publishing or presenting technical content.
Membership or engagement with professional organizations such as WEF, AWWA, or Water Environment Federation chapters.

Founded in 1973, ISG is a nationally recognized, multi-disciplinary firm delivering full-service architecture, engineering, environmental, and planning solutions. We are looking to add to our Water/Wastewater team with an Industrial Water/Wastewater Engineer. We are building a reputation for consistency, excellence, and thought leadership—and we want to be the best in the country. In our industrial water/wastewater practice, that means solving complex problems quickly, tailoring solutions to unique process conditions, and continuously learning and sharing knowledge through projects, publications, and conferences.

We are seeking an Industrial Water/Wastewater Process Engineer who thrives in fast-paced environments and is energized by variety—variety in technology, client operations, and project challenges. Unlike municipal work where loads and solutions are often consistent, our industrial projects can vary widely and move quickly. The right person will be inquisitive, data-driven, and confident in doing sound process design—not copy/paste—while applying common-sense engineering to validate that calculations and outcomes make sense.

This role will contribute to industrial client projects (e.g., food & beverage, dairy, agriprocessing, manufacturing) by developing process designs for water and wastewater treatment, reuse, and related systems. You’ll collaborate with senior engineers, mentor interns/early-career team members, and actively engage in technical learning and industry presence.

What You’ll Do

Process Design & Calculations: Develop process designs and perform detailed calculations (mass balances, hydraulic profiles, equipment sizing, process modeling) for industrial water/wastewater systems (physical/chemical, biological, pretreatment, reuse)
Tailored Solutions: Analyze influent/effluent variability and site-specific conditions to create solutions that fit each client’s process—no “one-size-fits-all”
Fast-Paced Project Delivery: Manage multiple, fast-moving industrial projects with clear priorities, organized workflows, and proactive communication
Technical Documentation: Produce PFDs/P&IDs, specifications, reports, and QA/QC checklists; coordinate with multi-disciplinary teams and vendors
Field & Implementation Support: Support site visits, pilot testing, startups/commissioning, and operator training as needed
Data-Driven Decisions: Structure and interpret data to inform design decisions; validate results with practical judgment (e.g., sanity-check mass and flow balances)
Continuous Learning & Thought Leadership: Contribute to internal knowledge-sharing, present or co-author technical papers, and represent ISG at industry and technical conferences
Collaboration & Mentorship: Work independently when appropriate while knowing when to ask questions, reference resources, and engage teammates; help grow our intern program and early-career staff

What You’ll Bring

Education: B.S. in Chemical Engineering or Environmental Engineering (preferred). Strong process-focused candidates from related disciplines may be considered
Experience: 2–4 years of relevant experience in industrial or water/wastewater process design. (We welcome more experienced applicants, understanding availability may be limited.)
Process Mindset: Demonstrated ability to think critically, ask the right questions, and tailor designs based on unique process conditions
Common-Sense Engineering: Habit of validating whether results are physically/logically reasonable (e.g., ensuring mass/flow balances make sense)
Data Orientation: Strong organization and comfort relying on data to drive decisions; proficiency with Excel and engineering calculation tools
Communication: Clear, concise verbal and written communication with clients and internal teams; ability to work independently and proactively seek guidance when needed.
PE or EIT certification or progress toward PE licensure
Experience with industrial sectors (food & beverage/dairy, agriprocessing, manufacturing)
Familiarity with process modeling tools and developing PFDs/P&IDs
Experience presenting at or attending industry and technical conferences (e.g., WEFTEC, Water Reuse) and interest in publishing/presenting technical content
Membership or engagement with professional organizations (WEF, AWWA, Water Environment Federation chapters, etc.)

About the Company

ISG

Multidisciplinary employee-owned design and consulting firm

ISG is a 100 percent employee-owned, multidisciplinary design and consulting firm with more than 50 years of experience. It serves multiple markets and brings together experts from different fields to collaborate on projects, giving clients access to a broad knowledge base, practical creativity, and wide perspectives. Its approach combines long-standing client relationships with cross-disciplinary teams to translate client goals into integrated solutions across planning, design, and advisory services. Unlike firms that are siloed by discipline, ISG differentiates itself through employee ownership, deep collaboration, and a culture that emphasizes trust, accountability, and broad industry insight. The goal is to help clients succeed by delivering well-rounded, feasible solutions that consider economics, aesthetics, engineering, and community impact.

Company size: 501-1,000
Company stage: Not listed
Total funding: Not listed
Headquarters: Mankato, MN
Founded: 1973

Recently Posted Jobs

Explore more opportunities at ISG

See more jobs