Senior Groundwater Modeler / Hydrogeologist

HDR; Philadelphia (Philadelphia County); On-site; USD 90,000 - 130,000; Full time

Job summary

HDR is seeking a Groundwater Modeler/Hydrogeologist in the United States to contribute to hydrodynamic and water quality modeling projects. You will assist senior modelers, analyze data, and help prepare reports and presentations for clients and teams.

This role emphasizes technical rigor, field data integration, and collaboration in a growing employee-owned culture. The position requires a strong background in environmental hydrology, experience with groundwater monitoring, and the ability to

Qualifications

• Bachelor's degree in environmental engineering/science or closely related field.
• At least 7 years of experience in hydrodynamic or water quality modeling.
• Strong analytical and problem-solving abilities.
• Excellent oral and written communication skills.
• Experience with Microsoft Office Suite.
• Experience with groundwater monitoring reports and data evaluation.

Responsibilities

• Work under senior modelers on hydrodynamic, sediment transport and water quality modeling projects.
• Evaluate thermal impacts, contaminants, nutrients, and water quality parameters in various water bodies.
• Acquire, organize and analyze environmental data.
• Set up and run mathematical models.
• Perform quality-control checks on model inputs and results.
• Participate in meetings, proposals, reports and presentations.
• Develop statistical and graphical comparisons of model results.
• Perform other duties as needed.

Skills

Analytical skills

Problem-solving

Communication skills

Microsoft Office

Independent worker

Team collaboration

Education

Bachelor's degree in environmental engineering/science or closely related field

Master's or Ph.D. in a relevant field (preferred)

Tools

gINT

OpenGround

Surfer

Aqtesolv

Job description

At HDR, our employee-owners are fully engaged in creating a welcoming environment where each of us is valued and respected, a place where everyone is empowered to bring their authentic selves and novel ideas to work every day. As we foster a culture of inclusion throughout our company and within our communities, we constantly ask ourselves: What is our impact on the world?

Watch Our Story:' https://www.hdrinc.com/our-story'

Each and every role throughout our organization makes a difference in our ability to change the world for the better. Read further to learn how you could help make great things possible not only in your community, but around the world.

In the role of Groundwater Modeler/Hydrogeologist we'll count on you to:

• Work under more-senior modelers, using prescribed methods in various data analysis and modeling assignments as part of hydrodynamic, sediment transport and water quality modeling projects
• Evaluate thermal impacts, pathogens, biochemical (BOD) dissolved oxygen, nutrients and algae, or organic or metal contamination in lakes, streams, rivers, estuaries or coastal waters
• Acquire, organize and analyze environmental data
• Set up and execute mathematical models
• Perform quality-control checks on model input and results
• Participate in project meetings, proposal preparation, report writing and presentations
• Develop statistical and graphical comparisons of model results and data
• Perform other duties as needed

Preferred Qualifications

• A minimum of ten (10) years of professional experience as a hydrogeologist or closely aligned profession. Advanced degrees (Master's or Ph.D.) in one of the above fields will substitute for one year of the required experience.
• Demonstrated experience conducting contaminated site investigations involving sample collection and analysis of various media including soil, groundwater, surface water, and sediment.
• Experience preparing groundwater monitoring reports and evaluating laboratory analytical data.
• Demonstrated knowledge of conceptual site models and the ability to critically analyze these models to identify data gaps and inform field investigation scoping activities.
• Demonstrated experience performing drilling, well installation, slug tests, and pump tests in consolidated and unconsolidated formations.
• Professional Geologist (PG) or Certified Professional Geologist (CPG) certification.
• Prior experience with Federal environmental regulations (CCR, CERCLA, RCRA, CWA, CAA, etc).
• Experience working on Coal Combustion Residual (CCR) projects involving groundwater monitoring, statistical analysis evaluations, site characterization, and corrective measures development.
• Familiarity using boring log digitization software such as gINT or OpenGround and other hydrogeological software including Surfer and Aqtesolv.
• Ability and willingness to perform physically demanding tasks in adverse environmental conditions (rugged terrain, remote locations, hot and cold temperatures).
• OSHA 40 Hour HAZWOPER Certification and MSHA training are a plus.
• Professional Engineer (PE) license
• Candidates who reside locally in the Greater Philadelphia area are preferred

Required Qualifications

• Bachelor's degree in environmental engineering/science, oceanography or closely related field
• A minimum of 7 years of experience in hydrodynamic or water quality modeling projects
• Strong analytical and problem-solving skills
• Strong oral and written communication skills
• Experience with Microsoft Office Suite
• Self-motivated, able to work independently and with a project team to completion of task
• Excellent oral and written communication skills
• An attitude and commitment to being an active participant of our employee-owned culture is a must

What We Believe

HDR is our company. Together, we build on each other's life experiences and perspectives to make great things possible every day. This shapes our collaborative culture, encourages organizational trust and connects us closer to the clients and communities we serve.

Our Commitment

As employee owners, we all have a role in creating an inclusive environment where each of us is welcomed, valued, respected and empowered to bring our authentic selves to work every day.

Our eight Employee Network Groups (Asian Pacific, Black, Hispanic/Latino(a), LGBTQ+, People with Disabilities, Veterans, Women, Young Professionals) help create a sense of belonging and foster a supportive environment where everyone is empowered to engage and contribute. Each group has an executive sponsor and is open to all employees.

Primary Location: United States-Pennsylvania-Plymouth Meeting

Other Locations: United States-Pennsylvania-Philadelphia

Industry: Waste

Schedule: Full-time

Employee Status: Regular

BusinessClass: Site Investigation and Remediation

Job Posting: Aug 20, 2026

At HDR, we are committed to the principles of employment equity. We are an Aff… (https://www.hdrinc.com/equal-employment-opportunity-employer). We consider all qualified applicants, regardless of criminal histories, arrest and conviction records.