Public engineering firm directory

Find engineering consulting firms by capability and location.

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3 Phase Associates LLC

Chattanooga, TN

Electrical Engineering and Consulting Services

Website1 office2 credentialsFounded 2016Size Estimate: 10-49 employeesUpdated Jun 2026

Service detail: Electrical Engineering

Service: Electrical EngineeringService: Power System CalculationsService: Arc Flash AnalysisIndustry: UtilitiesIndustry: Power Transmission & DistributionType: Electrical Engineering+31 more

A.W. Schultz Inc.

Shawnee, KS

Trusted Engineering and Integration Since 1977

WebsitePhone1 office3 credentialsFounded 1977Updated Jun 2026

Service detail: Process Control and SCADA Systems

Service: Process Control and SCADA SystemsService: Process Visualization & HMI/OITService: PLC ProgrammingIndustry: Water SupplyIndustry: WastewaterType: Automation & Controls+25 more

AAI Environmental Corporation

Ashland City, TN

Professional environmental site assessments and due diligence services nationwide

WebsitePhone1 office6 projects1 credentialsFounded 1995Updated Jun 2026

Project: Windmill Farm Initial Planning Study

Service: Phase I Environmental Site Assessment (ESA)Service: Phase II Environmental Site AssessmentService: Phase III Environmental AssessmentIndustry: CommercialIndustry: ResidentialType: Environmental Engineering+34 more

AMG, Inc.

Dayton, OH

Industrial Facility Engineering

WebsitePhone1 office12 projects1 leaders2 credentials2 publications

Project: Calcium Carbonate Production Plant

Service: Process EngineeringService: PFD and P&ID DevelopmentService: Material and Energy Balance SimulationIndustry: ChemicalsIndustry: Food & BeverageType: Automation & Controls+73 more

AMS Corporation

Knoxville, TN

Innovating Nuclear Technology

WebsitePhone1 office10 leaders5 credentialsFounded 1977Size Estimate: 100 employees

Service detail: I&C Performance Testing

Service: I&C Performance TestingService: Online Monitoring (OLM)Service: Reactor Thermal Power CalculationsIndustry: NuclearIndustry: Oil & GasType: Automation & Controls+20 more

AT Engineering Services

Long Beach, CA

AT Engineering Services is a California consulting engineering practice providing mechanical, process, oil and gas, energy, petrochemical, chemical, pharmaceutical, industrial, and power engineering services. AT Engineering Services has operated since 1993 and supports clients with technical engineering design and consulting.

WebsitePhone1 officeFounded 1993Updated Jun 2026

Service detail: Mechanical and Plumbing Engineering

Service: Mechanical and Plumbing EngineeringService: Process EngineeringService: Heat Transfer and Piping DesignIndustry: Oil & GasIndustry: PetrochemicalType: Mechanical Engineering+10 more

ATSI, Inc.

Amherst, NY

Changing the World Since 1977

WebsitePhone1 officeFounded 1977Size Estimate: 10-49 employeesUpdated Jun 2026

Service detail: Front-End Engineering & Design (FEED)

Service: Front-End Engineering & Design (FEED)Service: FEL-1: Conceptual Engineering & FeasibilityService: FEL-2: Planning & Specification DevelopmentIndustry: Renewable EnergyIndustry: ChemicalsType: Process Engineering+39 more

Absg Consulting Inc

Spring, TX

Data-Driven Solutions for Risk and Reliability

WebsitePhone4 offices1 projects1 credentialsFounded 1971Size Estimate: 250-999 employees

Project: ISO 27001 Certification Implementation

Service: Risk and Safety ManagementService: Process SafetyService: Cultural Cause AnalysisIndustry: ChemicalsIndustry: GovernmentType: Process Safety Engineering+9 more

Abysmal Corporation LLC

Integrated Engineering, Environmental, and IT Solutions for Efficiency, Safety, and Sustainability

Website6 projectsUpdated Jun 2026

Project: Redstone Arsenal Facility Audits & Energy Systems

Service: Engineering ServicesService: Chemical EngineeringService: Civil EngineeringIndustry: Environmental & RemediationIndustry: ChemicalsType: Environmental Engineering+22 more

Advanced Creative Industries

Evansville, IN

Customer-guided and self-directed engineering and design-build services

WebsitePhone1 office7 projects1 leadersUpdated Jun 2026

Project: 27 Ft. Film Stretcher and Tester Machine

Service: Industrial Machinery & EquipmentService: Process Skid EngineeringService: Custom Machine DevelopmentIndustry: ManufacturingIndustry: IndustrialType: Process Engineering+26 more

Advanced Cryogenics, Ltd

Tavernier, FL

Optimizing CO2 Management for Sustainability and Success

WebsitePhone1 office1 leaders6 publicationsSize Estimate: 1 employeesUpdated Jun 2026

Service detail: CO2 Source Evaluation

Service: CO2 Source EvaluationService: Technical Source AssessmentService: Business Viability AnalysisIndustry: Carbon CaptureIndustry: Oil & GasType: Process Engineering+18 more

Advanced Integration Group, Inc.

McKees Rocks, PA

Be in Control.

WebsitePhone1 office2 projects5 credentialsUpdated Jun 2026

Project: Lock and Dam Control Systems - Ohio River

Service: Control Systems Design and ImplementationService: PLC ProgrammingService: SCADA DevelopmentIndustry: Power GenerationIndustry: ManufacturingType: Automation & Controls+37 more

Airflow Sciences Corporation

Livonia, MI

Engineered CFD Solutions

WebsitePhone1 officeFounded 1975Updated Jun 2026

Service detail: Computational Fluid Dynamics (CFD) Modeling

Service: Computational Fluid Dynamics (CFD) ModelingService: Combustion ModelingService: Dispersion ModelingIndustry: Emissions ControlIndustry: Power GenerationType: Mechanical Engineering+53 more

Allen Engineering and Science

Jackson, MS

Allen Engineering and Science is an environmental, civil, and structural engineering practice serving private and public clients across the southeastern United States. Founded in 1993 as Eco-Systems and renamed in 2013, the company combines engineering, environmental science, planning, and construction management for oil and gas, manufacturing, energy, chemical, solid waste, real estate, and public-sector programs.

WebsitePhone6 offices5 leadersFounded 1993Updated Jun 2026

Service detail: Engineering

Service: EngineeringService: Civil EngineeringService: Environmental EngineeringIndustry: Oil & GasIndustry: ManufacturingType: Civil Engineering+26 more

Alliance Automation & Control, Inc.

Rogersville, AL

No project too large, no requirement too detailed.

WebsitePhone1 office1 credentialsFounded 2000Updated Jun 2026

Service detail: Electrical Engineering

Service: Electrical EngineeringService: Electrical DesignService: Automation & ControlsIndustry: AutomotiveIndustry: ChemicalsType: Automation & Controls+12 more

Alliance Engineers & Project Consultants

Beaumont, TX

Multidisciplined EPCM

WebsitePhone1 office5 projects1 leadersSize Estimate: 50-200 employeesUpdated Jun 2026

Project: Bringing Ground-Breaking Water-from-Air Technology to Market

Service: Project DevelopmentService: Phased Front-End LoadingService: Front-End Engineering DesignIndustry: Carbon CaptureIndustry: ChemicalsType: Automation & Controls+43 more

Alliance Technical Group

Decatur, AL

Alliance Technical Group is a full-service environmental services company founded in 2000 in Decatur, Alabama, with over 2,200 employees and more than 60 testing and laboratory locations across the United States and Canada. Alliance helps industrial, manufacturing, energy, and government clients achieve environmental compliance through on-site testing and monitoring, laboratory testing and analysis, and regulatory consulting. The company operates 110-plus mobile laboratories and delivers services across stack testing, LDAR, ambient air monitoring, CEMS, and environmental consulting.

WebsitePhone1 office4 leadersFounded 2000Updated Jun 2026

Service detail: Environmental Compliance

Service: Environmental ComplianceService: Regulatory StrategyService: Compliance AuditsIndustry: IndustrialIndustry: ChemicalsType: Environmental Engineering+19 more

Ambitech Engineering Corporation

Ambitech Engineering Corporation is a full-service provider of engineering design services with deep expertise in Front-End Loading (FEL/FEED) work. For clients wanting an integrated delivery model, Ambitech's position as part of Zachry Group gives clients the option to transition from FEED into a fully integrated, construction-led EPC model. It has 35 years of experience serving the Energy & Chemical, Food & Beverage, Pharma & Biotech, and Manufacturing industries.

WebsiteUpdated Jun 2026

Service detail: Front-End Loading / FEED Engineering

Service: Front-End Loading / FEED EngineeringService: Engineering Design ServicesService: EPC Transition SupportIndustry: Oil & GasIndustry: ChemicalsType: Process Engineering+5 more

AnSight LLC

Ann Arbor, MI

Insights Through Analysis

WebsitePhone1 office3 projects1 leaders7 credentials3 publications

Project: Laboratory Fume Hood Exhaust Plume Analysis

Service: HVAC and Building Systems OptimizationService: HVAC Performance OptimizationService: Radiant Systems Design OptimizationIndustry: Data CentersIndustry: Mission Critical FacilitiesType: Mechanical Engineering+34 more

Anguil Environmental Systems

Milwaukee, WI

Innovative Pollution Control Technologies

WebsitePhone1 office3 credentialsFounded 1978Updated Jun 2026

Service detail: Air Pollution Control

Service: Air Pollution ControlService: Regenerative Thermal Oxidizers (RTOs)Service: Catalytic Recuperative Oxidizers (CATOXs)Industry: ManufacturingIndustry: Food & BeverageType: Environmental Engineering+22 more

Anvil Engineering

St. Louis, MO

Leaders in structural engineering

WebsitePhone1 office4 projects2 leadersFounded 2016Updated Jun 2026

Project: ICL Group Chemical Processing Building

Service: Foundations & Flatwork DesignService: Building FoundationService: Equipment FoundationIndustry: IndustrialIndustry: ManufacturingType: Structural Engineering+17 more

Apex Engineering, PLLC

Calvert City, KY

Apex Engineering, PLLC is a full-service multi-discipline engineering firm headquartered in Calvert City, Kentucky, incorporated in 1974. Through its family of companies - Apex Controls Specialists and Apex Modular Extrusion Systems - it provides engineering, automation, and design-build services for industrial clients. Clients include major producers of specialty chemicals, polymers, refrigerants, nonferrous metals, coal, aggregates, electric power, rubber, elastomer products, pulp, and paper.

WebsitePhone2 officesFounded 1974Updated Jun 2026

Service detail: Specialty Engineering

Service: Process EngineeringService: Civil EngineeringService: Structural EngineeringIndustry: ChemicalsIndustry: MetalsType: Civil Engineering+35 more

Apex PetroConsultants LLC

Where Deep Ethylene Expertise Meets Strategic Decision-Making

Website7 projects1 leaders2 publicationsSize Estimate: 1-9 employeesUpdated Jun 2026

Project: 10% CAPEX Reduction for Integrated Mixed-Feed Complexes

Service: Project Development and Execution OversightService: Independent Technology SelectionService: FEED and Detailed Engineering ReviewIndustry: PetrochemicalIndustry: ChemicalsType: Chemical Engineering+20 more

Applied Automation and Controls, Inc.

Expert Automation & Control Solutions for Oil & Gas

Website5 credentialsUpdated Jun 2026

Service detail: Automation & Control Systems Engineering

Service: Automation & Control Systems EngineeringService: Data Acquisition SystemsService: SCADA and HMI DevelopmentIndustry: Oil & GasIndustry: IndustrialType: Automation & Controls+27 more