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Assistant Geologist Jobs in Illinois (NOW HIRING)

TERRACON

Staff Geologist

Lombard, IL · On-site

$68K - $82K/yr

May assist more senior Geologists on large, more complex projects. * Performs site visits, field observations and field data collection or assignments. * Implements technical requirements to complete ...

TERRACON

Staff Geologist

Lombard, IL · On-site

$68K - $82K/yr

May assist more senior Geologists on large, more complex projects. * Performs site visits, field observations and field data collection or assignments. * Implements technical requirements to complete ...

Sci Engineering

Staff Geologist

O Fallon, IL · On-site

$60 - $75/hr

Conduct geological field investigations and data collection * Assist with laboratory testing * Monitoring and oversight of construction projects including deep foundations, ground improvement ...

New

Trc Companies, Inc.

Geologist

Chicago, IL · On-site

$55 - $72/hr

... geologist/hydrogeologist to join our growing Engineering, Construction and Remediation (ECR ... Conduct and evaluate data from slug tests and aquifer tests. * Assist with 3D data visualization ...

LSU AgCenter

Research Associate 3, 4, or 5

Energy, IL · On-site

Support geologists and other researchers with field mapping technology. (10%) Help develop and maintain web-based GIS applications and interactive maps for public data dissemination. Assist in ...

Invenergy

Senior Geospatial Analyst

Chicago, IL

$72K - $85K/yr

Conduct geospatial, geological, and site suitability analyses to support geothermal project ... * Assist with permitting, development, and electrical interconnection activities, as needed.

Invenergy, LLC

Senior Geospatial Analyst

Chicago, IL · On-site

$72 - $85/hr

Conduct geospatial, geological, and site suitability analyses to support geothermal project ... * Assist with permitting, development, and electrical interconnection activities, as needed.

Invenergy LLC

Senior Geospatial Analyst

Chicago, IL · On-site

$72K - $85K/yr

Conduct geospatial, geological, and site suitability analyses to support geothermal project ... * Assist with permitting, development, and electrical interconnection activities, as needed.

Invenergy LLC

Senior Geospatial Analyst

Chicago, IL

$72K - $85K/yr

Conduct geospatial, geological, and site suitability analyses to support geothermal project ... * Assist with permitting, development, and electrical interconnection activities, as needed.

TERRACON

Assistant Project Manager

Lombard, IL · On-site

$71K - $90K/yr

Assistant Project Manager Location: Lombard, IL Estimated Salary Range: $71,060.00 - $90,640.00 ... or Geology and a minimum of 2 years' related experience. Or, in lieu of a degree, a minimum of 6 ...

TERRACON

Assistant Project Manager

Chicago, IL · On-site

$71K - $90K/yr

Assistant Project Manager Location: Lombard, IL Estimated Salary Range: $71,060.00 - $90,640.00 ... or Geology and a minimum of 2 years' related experience. Or, in lieu of a degree, a minimum of 6 ...

Terracon

Assistant Project Manager

Chicago, IL · On-site

$71 - $91/hr

Assistant Project Manager Location: Lombard, IL Estimated Salary Range: $71,060.00 - $90,640.00 ... or Geology and a minimum of 2 years' related experience. Or, in lieu of a degree, a minimum of 6 ...

Wood Plc

Evans Scholars

Chicago, IL · On-site +1

$15.50 - $20/hr

Interns will work with engineers, architects, geologists, and other scientists on a variety of ... Key Responsibilities: * Assist in development of proposals across a diverse client base, including ...

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All JobsGeologist JobsAssistant Geologist JobsAssistant Geologist Jobs in Illinois

Assistant Geologist information

See Illinois salary details

$34.9K

$74.6K

$120.6K

How much do assistant geologist jobs pay per year?

As of Sep 3, 2026, the average yearly pay for assistant geologist in Illinois is $74,644.00, according to ZipRecruiter salary data. Most workers in this role earn between $54,300.00 and $90,100.00 per year, depending on experience, location, and employer.

What is an assistant geologist?

Assistant Geologists are entry-level professionals who support geologists in studying the Earth’s structure, composition, and processes. Their duties typically include collecting and analyzing soil, rock, and water samples, conducting field surveys, and assisting with geological mapping. They work under the supervision of senior geologists in industries such as environmental consulting, mining, oil and gas, and government agencies. This role provides valuable hands-on experience and is often a stepping stone to more advanced geoscience positions.

What are the typical responsibilities of an assistant geologist in a fieldwork setting?

As an Assistant Geologist, you will often support senior geologists during field investigations, which may include collecting soil and rock samples, conducting site surveys, and recording geologic observations. You may also assist in geophysical or geochemical testing and help with mapping and data analysis back in the office. Fieldwork can be physically demanding and often requires travel to remote locations, but it provides valuable hands-on experience and exposure to a variety of geological projects. Team collaboration is common, as you’ll frequently work with environmental scientists, engineers, and drilling crews to ensure data accuracy and project success.

What are the key skills and qualifications needed to thrive as an assistant geologist, and why are they important?

To thrive as an Assistant Geologist, you need a solid background in geology or earth sciences, typically supported by a relevant bachelor's degree and foundational fieldwork experience. Familiarity with GIS software, mapping tools, and data analysis platforms is important, and certifications like OSHA HAZWOPER may be required for field safety. Strong observational skills, attention to detail, and effective communication are vital soft skills for collecting and reporting accurate geological data. These skills ensure reliable data collection, adherence to safety standards, and successful collaboration on geological projects.

What is the difference between Assistant Geologist vs Geoscientist?

AspectAssistant GeologistGeoscientist
Required CredentialsBachelor's degree in geology or related fieldBachelor's or master's degree in geology, geoscience, or related field
Work EnvironmentFieldwork, lab analysis, data collectionResearch, data analysis, fieldwork, report writing
Employer & Industry UsageMining, environmental consulting, oil & gasResearch institutions, government agencies, energy companies
Common Search & ComparisonYesYes

Assistant Geologists typically perform fieldwork and basic data collection under supervision, while Geoscientists often engage in research, complex data analysis, and report writing. Both roles require similar educational backgrounds, but Geoscientists usually hold advanced degrees and work in broader research or policy settings. Understanding these differences helps job seekers identify the right career path in geology-related fields.

Is there a high demand for assistant geologists?

The demand for assistant geologists is generally steady, especially in industries such as mining, oil and gas, environmental consulting, and construction. Employment opportunities depend on industry activity, geographic location, and the candidate's skills in fieldwork, data analysis, and geological software. Entry-level positions are often available for those with relevant education and certifications.

What are the most commonly searched types of Geologist jobs in Illinois?

The most popular types of Geologist jobs in Illinois are:

What are popular job titles related to Assistant Geologist jobs in Illinois?

For Assistant Geologist jobs in Illinois, the most frequently searched job titles are:

What job categories do people searching Assistant Geologist jobs in Illinois look for?

The top searched job categories for Assistant Geologist jobs in Illinois are:

What cities in Illinois are hiring for Assistant Geologist jobs?

Cities in Illinois with the most Assistant Geologist job openings:

Assistant Geologist jobs near you
Infographic showing various Assistant Geologist job openings in Illinois as of August 2026, with employment types broken down into 94% Full Time, and 6% Part Time. Highlights an 94% In-person, and 6% Remote job distribution, with an average salary of $74,644 per year, or $35.9 per hour.

Staff Geologist

TERRACON

Lombard, IL • On-site

$68K - $82K/yr

Full-time

Posted 29 days ago

Terracon rating

7.2

Company rating: 7.2 out of 10

Based on 121 frontline employees who took The Breakroom Quiz

51st of 72 rated business consultants

Job description


Staff Geologist
Location: Lombard, IL
Salary - $68,420.00 - $82,060.00
Evaluate and interpret subsurface investigation data, including soil, groundwater, and bedrock conditions, to assess environmental and geologic site characteristics and support engineering design recommendations. Develop detailed subsurface maps, geologic models, and cross-sections while collaborating with multidisciplinary teams of engineers, geologists, and environmental scientists on complex infrastructure, development, and remediation projects.
Lead and oversee field investigations, including soil borings, groundwater monitoring well installation, environmental sampling, and geotechnical testing activities. Analyze soil stratigraphy, groundwater elevations, hydrogeologic conditions, and environmental analytical data to identify site constraints, assess risk, and support regulatory compliance.
Prepare comprehensive technical reports, work plans, and environmental documentation related to site characterization, due diligence, remediation, and construction support activities. Contribute to projects involving earthwork and foundation design, Phase I and Phase II Environmental Site Assessments (ESA), groundwater monitoring and sampling programs, remediation planning, well design, and seismic and geologic hazard evaluations.
Responsibilities
  • Follow safety rules, guidelines and standards for all projects. Participate in pre-task planning. Report any safety issues or concerns to management.
  • Be responsible for maintaining quality standards on all projects.
  • Proficient Geologist/ Hydrogeologist responsible for conducting site testing and making recommendations for systems design on smaller projects of minimal complexity.
  • May assist more senior Geologists on large, more complex projects.
  • Performs site visits, field observations and field data collection or assignments.
  • Implements technical requirements to complete client projects by directing and supervising field staff to sample, test and collect data and/or document site activities.
  • Responsible for developing written proposals to clients for approval by senior level professionals.
  • Evaluates moderately complex laboratory and field data and assembles in written reports.
  • May serve as team member or participate in meetings and communications with client pertaining to specific projects/tasks.
  • May oversee work performed by lower-level Geologists/Hydrogeologists.

Qualifications
  • Bachelor's degree in Geology, Hydrogeology or related field and a minimum of 3 years' related experience.
  • Master's degree preferred.
  • A valid driver's license with acceptable violation history may be required.
  • Preferred Qualifications:
    • Certification in field of expertise

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