Senior Water/Wastewater Project Engineer

Gonzalez Companies, LLC; St. Louis (MO); On-site; USD 114,616,000 - 157,597,000; Full time

Benefits offered by this job

Competitive salary

Medical, dental and vision insurance

Flexible Spending Account

Health Savings Account

401K

Bonus program

Paid holidays and generous PTO

Professional development

Team of creative professionals

Job summary

Gonzalez Companies, LLC is actively seeking a Project Engineer (III/IV) - Water/Wastewater in St. Louis, MO. You will lead design, analysis, and oversight of water and wastewater facilities, pump stations, pipelines, and related infrastructure, with emphasis on compliance and quality control.

The role requires EI/EIT, 4–8+ years of experience, and proficiency in hydraulic modeling and AutoCAD/Civil 3D. Strong leadership and client coordination skills are essential.

Qualifications

• Bachelor's degree in Civil, Environmental, or related engineering field.
• EI/EIT required; PE registration preferred or in progress.
• 4–8+ years of experience in water/wastewater design, permitting, or construction support.
• Proficiency with hydraulic modeling tools (WaterGEMS, SewerGEMS, InfoWater, SWMM, etc.).
• Strong experience with AutoCAD/Civil 3D; BIM/Revit knowledge preferred.
• Demonstrated experience with pump systems, process equipment, site layout, and utility design.
• Excellent analytical, project management, and problem-solving skills.
• Strong leadership, communication, and client coordination abilities; mentoring junior engineers.

Responsibilities

• Lead the design, analysis, and technical oversight of water and wastewater treatment facilities, pump stations, pipelines, and related infrastructure.
• Prepare and review engineering calculations, design drawings, specifications, and technical reports.
• Conduct hydraulic modeling and system analysis to optimize water distribution and sewer collection networks.
• Manage field investigations, site assessments, and construction observation; provide technical guidance to junior engineers.
• Develop project scopes, cost estimates, schedules, and proposals; support project management activities.
• Coordinate multidisciplinary teams to ensure integrated and compliant project designs.
• Review and ensure compliance with design standards, regulatory requirements, and permitting processes.
• Serve as a point of contact for clients, contractors, and regulatory agencies; communicate technical information clearly and effectively.
• Mentor and support junior staff; uphold quality control and company engineering standards.

Skills

EI/EIT

PE in progress

Water/wastewater design

Hydraulic modeling

AutoCAD/Civil 3D

BIM/Revit

Project management

Leadership

Client coordination

Education

Bachelor’s degree in Civil/Environmental Engineering

Tools

WaterGEMS

SewerGEMS

InfoWater

SWMM

AutoCAD/Civil 3D

BIM/Revit

Job description

Gonzalez Companies, LLC is actively seeking a Project Engineer (III/IV) - Water/Wastewater in St. Louis, MO. You will lead design, analysis, and oversight of water and wastewater facilities, pump stations, pipelines, and related infrastructure, with emphasis on compliance and quality control.

The role requires EI/EIT, 4–8+ years of experience, and proficiency in hydraulic modeling and AutoCAD/Civil 3D. Strong leadership and client coordination skills are essential.