What Aestus does

Aestus, LLC is a Loveland, Colorado-based subsurface imaging and electrical hydrogeology consulting firm founded in 2001 by CEO Stuart McDonald. The company provides ultra-high-resolution electrical resistivity imaging (ERI) services through its proprietary GeoTrax Survey™ platform, originally developed in partnership with Oklahoma State University researchers, that produces 2D cross-sections and 3D visualizations of subsurface conditions including aquifers, contamination plumes, and geohazards. Aestus delivers a four-tier service engagement model — GeoTrax Survey (basic 2D imaging, ~5 weeks), GeoTrax Viz (3D modeling, ~7-8 weeks), GeoTrax CSM (conceptual site model for complex sites, ~9-10 weeks), and GeoTrax CSM+ (expert tier with calibration drilling and full reporting, ~17-18 weeks) — plus a recurring GeoTrax Monitoring™ time-lapse service and a new licensed GeoTrax Cam™ product (launching January 2026) built on Guideline Geo/ABEM hardware.

The company serves environmental consulting and remediation firms (HDR, AECOM, Arcadis, ERM, Burns & McDonnell, Ensolum, Greystone), municipalities and water utilities (City of Ada), oil and gas and mining operators (Chevron, Enterprise Products), and federal and state government agencies, with a documented footprint across all 50 US states plus projects in Europe, Asia, South America, the Caribbean, and Australia. Revenue mechanics are dominated by quote-based professional services engagements, with each project grounded in on-site field deployment of Aestus crews, proprietary data acquisition, and expert interpretation by Ph.D. hydrogeophysicists led by CTO Todd Halihan (also Sun Company Clyde Wheeler Chair at Oklahoma State University). The firm is pursuing a deliberate platform shift with GeoTrax Cam licensing/training and GeoTrax Monitoring subscriptions to layer recurring and licensed revenue on top of the core project services model.

The business is privately held by founders and employees, has no disclosed outside funding, and operates with a small distributed team of approximately 10-15 technical and administrative professionals across nine US cities. Customer outcomes cited in case studies include $20M+ in remediation cost avoidance for a southern US refinery, site closure for the City of Ada's municipal supply wells within two years, and elimination of LNAPL seeps at a refinery within four years — outcomes that anchor the company's value proposition of "scan first, then drill" to reduce wasted drilling and accelerate regulatory site closure.

Name

Aestus

Legal name

Aestus LLC

Website

https://aestusllc.com

Company type

Private

Founded year

2001

Operating status

Operating

Headcount range

1–10 employees

Short description

Aestus is a Colorado-based subsurface imaging consultancy that delivers proprietary electrical resistivity imaging and electrical hydrogeology services to environmental consultants, municipalities, energy operators, and government agencies for contaminated site characterization, groundwater development, and geohazard assessment.

Ownership category

akta.pro rank

Product category

Subsurface Imaging Services

NAICS

Geophysical Surveying and Mapping Services (54136), Geophysical Surveying and Mapping Services (541360), Support Activities for Mining (2131), Remediation Services (562910)

SIC

Oil & Gas Field Exploration Services (1382), Oil & Gas Field Services, Nec (1389)

akta.pro primary industry

Geotechnical & Subsurface Engineering Consulting (BPAHAIAB)

akta.pro secondary industries

Landfill/Impoundment Hydrogeology (Liners, Leachate, Seepage Studies) (EUAHAFAH), Site Assessment & Remediation (Phase I/II, Cleanup Oversight) (BPAHAJAC), Environmental Data Integration, ETL & Interoperability (APIs, Standards, Data Pipelines) (EUAHAKAB), Mineral Exploration & Geoscience Services (Geology, Geophysics, Geochemistry, Resource Modeling) (IMAKAKAA)

Keywords

• Subsurface imaging services
• Electrical resistivity imaging
• Environmental site characterization
• Groundwater resource development
• Geohazard assessment services

Headquarters

HQ city

Loveland

HQ country

United States

HQ region

North America

Offices9 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. GeoTrax Survey Services: Aestus provides subsurface imaging and interpretation services through four service tiers. GeoTrax Survey (basic) delivers 2D electrical resistivity images with 3D visualization. GeoTrax Viz adds 3D modeling with limited site integration. GeoTrax CSM provides comprehensive conceptual site models for complex sites. GeoTrax CSM Plus delivers maximum certainty with full data integration and calibrated imaging. Engagement timelines range from ~5 weeks (Survey) to ~17-18 weeks (CSM Plus).
2. Site Characterization Consulting: Expert interpretation of subsurface data combined with existing site data to build integrated 2D/3D conceptual site models. Includes recommendations for targeted confirmation drilling locations and regulatory compliance support.
3. GeoTrax Cam Licensing and Training: Aestus provides training and certification for field teams to use the GeoTrax Cam system. Clients collect field data and upload to Aestus for processing, analysis, and optional 3D modeling. Includes built-in QC checks and optional data integration and interpretation support.
4. GeoTrax Monitoring Subscriptions: Ongoing time-lapse subsurface monitoring services that compare electrical resistivity images over time. Monitoring programs are customized to client and project needs and can last days or years.

Go-to-market motion2 records

Distribution channels2 records

Marketing channels8 records

Core offering

Aestus delivers subsurface imaging and interpretation services for environmental cleanup, groundwater production, geohazard assessment, and monitoring projects using its proprietary GeoTrax electrical resistivity imaging (ERI) technology. The company deploys field crews to client sites to perform high-resolution subsurface scans, then integrates the data with existing site information to produce 2D images, 3D visualizations, and conceptual site models that guide targeted drilling and remediation decisions. Services scale from basic GeoTrax Survey scans to full GeoTrax CSM Plus conceptual site model deliverables.

Product overview

Aestus is a subsurface imaging and electrical hydrogeology services company offering a tiered service portfolio centered on its proprietary GeoTrax™ technology platform. The core GeoTrax Survey™ provides high-resolution electrical resistivity imaging for subsurface visualization, with services escalating through four tiers: GeoTrax Viz™ (3D visualization with site data integration), GeoTrax CSM™ (advanced conceptual site model development), and GeoTrax CSM Plus™ (expert service with calibration and full reporting). Supporting offerings include GeoTrax Monitoring™ for time-lapse subsurface change detection and GeoTrax Cam™ for licensed deployment to field teams worldwide. All services leverage the proprietary Electrical Hydrogeology™ methodology combining electrical imaging with hydrogeological interpretation to deliver actionable subsurface insights for environmental cleanup, groundwater development, geohazard mitigation, and monitoring applications.

Differentiator

Problem solved

Functional benefit

Brands

• GeoTrax Survey™: Ultra-high resolution subsurface imaging technology using proprietary electrical resistivity imaging for 2D/3D visualization of underground conditions.
• GeoTrax Viz™
• GeoTrax CSM™
• GeoTrax CSM Plus™
• GeoTrax Monitoring™
• GeoTrax Cam™
• Electrical Hydrogeology™

Products and services

• GeoTrax Survey High-resolution subsurface imaging service using proprietary electrical resistivity imaging technology to produce ultra-high-resolution 2D images of the earth's subsurface. Provides the foundational view of geology, contamination locations, well targets, geohazards, and monitoring change over time.
• GeoTrax Monitoring Time-lapse subsurface change detection service enabling comparison of high-resolution electrical resistivity images at the same location over hours, days, weeks, months, or years to track plume migration, aquifer recharge, or geohazard development. Monitoring programs are customized to client and project needs.
• GeoTrax Cam Licensed subsurface imaging system offered in partnership with Guideline Geo for international and budget-limited projects. Allows Aestus-certified field teams to collect electrical resistivity data on-site using proven Guideline Geo/ABEM hardware, then upload results to Aestus for proprietary data processing, 2D image generation, and 3D visualization.

Quantifiable outcome

• Saved refinery client over $20 million through targeted remediation enabled by GeoTrax Survey imaging and focused drilling approach
• +4 more outcomes

Named customers9 records

Segments5 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

One partnership is on record.

• Guideline GeocoreTechnology or IntegrationPartnership for GeoTrax Cam, a simplified subsurface imaging system. Guideline Geo provides proven hardware (ABEM equipment) while Aestus provides proprietary data acquisition process, training, certification, and data processing/interpretation. The partnership enables field teams worldwide to collect quality subsurface data using standardized hardware with Aestus' proprietary methodology.

Scale indicators7 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Zonge International: Zonge provides geophysical services and instrumentation including electrical resistivity, induced polarization, and electromagnetic surveys for environmental, geotechnical, and mining clients. Directly comparable to Aestus as a specialty geophysics contractor offering ERI-based subsurface imaging and interpretation services to similar customer segments.
• Advanced Geosciences Inc. (AGI): AGI manufactures and operates electrical resistivity and IP imaging systems (SuperSting) and supports subsurface imaging projects for environmental and geotechnical applications. Comparable to Aestus as a provider of high-resolution ERI surveys and related interpretation services, with overlapping customer base in environmental and engineering consulting.
• Geonics Limited: Geonics designs and supplies electromagnetic survey instruments (EM31, EM38, EM61) widely used for environmental site characterization, UXO detection, and groundwater studies. Comparable to Aestus as a specialist in non-invasive geophysical subsurface characterization for environmental applications.
• Mount Sopris Instrument Co. Mount Sopris manufactures borehole geophysical logging instruments used in hydrogeology, mining, and environmental applications. Comparable to Aestus as a specialist subsurface characterization firm serving overlapping environmental and groundwater clients with complementary (downhole vs. surface) geophysical methods.

Broad incumbents

• AECOM: Global EHS and engineering consulting firm with extensive environmental remediation practice and in-house geophysics capabilities. Aestus' large customers and competitors overlap with AECOM, which can deliver similar subsurface characterization either directly or via subconsultants like Aestus.
• Arcadis: Global design and consultancy firm with a large environment and water practice, frequently engaging subsurface characterization subcontractors. Directly comparable customer base and competing internal capabilities to Aestus in site assessment and remediation support.
• Tetra Tech: Leading environmental and water resources consulting firm with deep subsurface characterization and groundwater development practices. A frequent client and competitor to Aestus in environmental remediation and aquifer characterization work.
• ERM (Environmental Resources Management): Global sustainability and environmental consulting firm with extensive site assessment and remediation work. Listed as an Aestus customer (subconsultant relationship) and competes as a broader incumbent capable of bundling subsurface services into larger programs.

Emerging players

• Geoprobe Systems: Manufactures direct-push drilling and sampling tools widely used in conjunction with high-resolution site characterization. Complementary to Aestus in environmental site work, with overlapping customer relationships in the environmental consulting and remediation market.

Regional players

• HydroGeoLogic Inc. Environmental and groundwater consulting firm with strong federal agency relationships and in-house hydrogeology expertise. Comparable to Aestus as a specialist in hydrogeology and subsurface characterization, primarily serving U.S. government and DOD clients.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/aestus-llc

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Aestus