ISG

Water/Wastewater Engineer

345 North Reid Place Suite 300, Sioux Falls, SD 57103

On-site · Full-time · $65k–$190k (as posted)

First seen by offpeak October 6, 2026

Founded in 1973, ISG is a multi-disciplinary, full-service architecture, engineering, planning, and interior design firm, supporting clients throughout the nation. ISG is looking to add a Water/Wastewater Engineer to our dynamic engineering team. As a Water/Wastewater Engineer, you will make a real difference for Municipal and Industrial clients across the U.S., contributing to projects that improve lives and communities. We are a full-service, multi-disciplinary team, who perform award winning work in planning, design, survey, and construction. You will work alongside industry leaders, Casey Patton, PE, Water/Wastewater Practice Group Leader, and Brian Hiles, Senior Water/Wastewater Engineer, along with several other innovative Wastewater professionals.

Essential Duties

Develop comprehensive plans for water distribution networks, wastewater collection systems, and treatment facilities
Design key infrastructure components including pumping stations, pipelines, lift stations, and storage tanks
Perform hydraulic modeling and hydrological analyses to support system design and optimization
Lead cross-functional teams through all phases of project delivery—from planning and design to construction and commissioning
Prepare detailed technical reports, cost estimates, and construction documentation
Manage project timelines, budgets, and compliance with regulatory standards
Provide technical guidance during construction and operational phases to ensure quality and performance
Diagnose system issues and propose effective engineering solutions
Conduct feasibility studies and environmental impact assessments
Ensure all designs adhere to federal, state, and local regulations
Prepare environmental documentation and facilitate permitting processes
Collaborate with municipalities, utility providers, developers, and government agencies
Translate complex technical concepts into clear, accessible information for non-technical stakeholders

As an ISG employee owner, you will continue to grow in your career. You’ll learn from us, and we’ll learn from you. You’ll have the freedom and autonomy to do your best work with plenty of support along the way. Our culture is essential to our success and your engagement in it. Here are some projects we've worked on recently that might give you a better sense of what you'll be doing day to day:

Clarion Water Treatment System
Hartford, SD Reclamation Facility Improvements

We’ve listed a compensation range that reflects our expectations for this role, including both direct and indirect components. We understand that your experience and value may fall outside of this range. If you feel you're a strong fit but your compensation needs differ, we’re open to a conversation—let’s talk.

Skills, Knowledge and Expertise

Bachelor’s degree in Civil, Environmental, or Chemical Engineering
Professional Engineer (PE) license or Engineer-in-Training (EIT) certification
4–10+ years in water/wastewater design and computerized drafting of new and rehabilitated water treatment facilities, groundwater wells, water storage facilities, water distribution systems, pumping stations, wastewater treatment facilities, collection systems, and lift stations.
Familiarity with AutoCAD, GIS, hydraulic modeling software, and Microsoft Office
Strong analytical, problem-solving, and communication skills
Ability to work independently and in teams
Knowledge of industry standards

ISG Employee Owner Benefits

Medical, dental, and vision
Paid time off, pro-rated amount available on your start date
Paid holidays and paid volunteer time
Paid parental leave
Bi-annual profit sharing
Employee Ownership Stock Plan (ESOP)
401K retirement plan
Life insurance
HSA and FSA options
Bereavement leave
Supplemental voluntary benefits
Short term and long-term disability
Parking reimbursement, varies on office location
Cell phone plan reimbursement
Mileage reimbursement for ISG-approved travel