Public engineering firm directory

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Centuria Corporation

Reston, VA

A Data Driven Company

WebsitePhone2 offices3 projects7 leaders7 credentialsFounded 2002

Project: NOAA Radar Operations Center Mission Support Services

Service: Engineering & Scientific ServicesService: Systems EngineeringService: Modeling & SimulationIndustry: FederalIndustry: GovernmentType: Aerospace Engineering+61 more

ELOS

Hammond, LA

Where Natural Environments and Human Interests Intersect

WebsitePhone1 office6 leaders10 credentialsFounded 2006Updated Jun 2026

Service detail: Permitting Applications and Regulatory Compliance

Service: Permitting Applications and Regulatory ComplianceService: Environmental ServicesService: Environmental Site AssessmentsIndustry: GovernmentIndustry: FederalType: Environmental Engineering+26 more

Environ-Civil Engineering, Ltd.

Columbia, MD

Quality, Integrity, Innovation, and Responsiveness

WebsitePhone3 offices6 projects3 leaders12 credentialsFounded 1992

Project: WSSC Piscataway Water Resource Recovery Facility Bio-Energy Project

Service: Water & Wastewater EngineeringService: Water supply and distribution system designService: Distribution and transmission main systemsIndustry: GovernmentIndustry: FederalType: Water / Wastewater Engineering+50 more

Hassan Water Resources, PLC

Maidens, VA

Innovative Solutions to Water Resources Challenges

WebsitePhone1 office2 credentialsFounded 2007Size Estimate: 1-24 employeesUpdated Jun 2026

Service detail: Hydrologic and Hydraulic Engineering

Service: Hydrologic and Hydraulic EngineeringService: Watershed Hydrologic ModelingService: Riverine and Coastal Hydraulic ModelingIndustry: Water ResourcesIndustry: Stormwater & Flood ControlType: Water / Wastewater Engineering+25 more

Horsley Witten Group

Sandwich, MA

Your Partner. Nature's Steward.

WebsitePhone4 offices5 leadersFounded 1987Size Estimate: 75+ employeesUpdated Jun 2026

Service detail: Water Resources Management

Service: Water Resources ManagementService: Water SupplyService: WastewaterIndustry: GovernmentIndustry: Water ResourcesType: Civil Engineering+30 more

LCA Environmental, Inc.

Farmers Branch, TX

Providing Sustainable Environmental Solutions That Stand the Test of Time

WebsitePhone1 office2 projects6 leaders11 credentialsFounded 1992

Project: LBJ Freeway Environmental Compliance

Service: Environmental Site AssessmentService: Phase I Environmental Site AssessmentService: Phase II Environmental Site AssessmentIndustry: GovernmentIndustry: FederalType: Environmental Engineering+22 more

Loyola Enterprises Incorporated

Hampton, VA

Modeling, simulation, information technology, and audio-visual systems integration.

WebsitePhone1 office2 projects5 credentialsFounded 1991Updated Jun 2026

Project: NIFC Remote Automatic Weather Station Engineering Support

Service: Information Technology ServicesService: Software Engineering and ProgrammingService: IT Systems AdministrationIndustry: GovernmentIndustry: FederalType: Electrical Engineering+31 more

Michael Baker International

Pittsburgh, PA

We Make a Difference

Website18 offices5 projects15 leaders5 credentials4 publicationsFounded 1940

Project: Fika Remote Footbridge Build

Service: Infrastructure EngineeringService: Roadway and Highway DesignService: Bridge Design and InspectionIndustry: TransportationIndustry: Highways & RoadsType: Architecture & Engineering+46 more

Mid-South Testing, Inc.

Decatur, AL

Providing trusted Environmental, Geotechnical, and Civil Engineering services throughout Alabama and the Southeast.

WebsitePhone1 office2 credentialsFounded 1980Updated Jun 2026

Service detail: Environmental Engineering

Service: Environmental EngineeringService: Environmental Site Assessment & Due DiligenceService: Alabama Tank Trust Fund (ATTF) ContractingIndustry: GovernmentIndustry: TransportationType: Environmental Engineering+20 more

Pars Consulting Engineers, Inc.

Mission Viejo, CA

Pars Consulting Engineers, Inc. is a multi-discipline engineering and technical services firm founded in 1995 and wholly owned by Dr. Rafie Hamidpour, Ph.D., D.E., DABFE. Its staff holds primarily Master's and Doctoral degrees spanning civil, environmental, transportation, traffic, electrical, mechanical, and information technology disciplines. Pars serves federal, state, and municipal clients from offices in California, Kansas, and Maryland, offering professional engineering, technology, energy, environmental, and facilities management services under GSA Multiple Award Schedule contracts.

WebsitePhone3 offices1 leaders4 credentialsFounded 1995Size Estimate: 5-50 employees

Service detail: Transportation Engineering

Service: Transportation EngineeringService: Transportation Planning & ManagementService: Preliminary & Final Roadway DesignIndustry: FederalIndustry: GovernmentType: Automation & Controls+57 more

ProSource Consulting, LLC

Washington, DC

ProSource Consulting, LLC is a Washington, DC metropolitan facilities management and engineering support firm serving federal, state, local, commercial, and institutional clients. It provides operations and maintenance, facilities engineering, spatial data management, inspections, CAD design, project management, and administrative support, with named client work spanning Treasury, NIH, ATF, GSA, VA, DOE, and FDA facilities.

WebsitePhone2 offices1 leaders8 credentialsUpdated Jun 2026

Service detail: Facilities Operations & Maintenance

Service: Facilities Operations & MaintenanceService: Facilities and Engineering ManagementService: Engineering and Management StudiesIndustry: GovernmentIndustry: FederalType: Mechanical Engineering+48 more

The Mannik & Smith Group, Inc.

Toledo, OH

Technical Skill. Creative Spirit.

Website3 offices8 projects4 leaders2 credentialsFounded 1955Size Estimate: 50-200 employees

Project: Waterfront Walkway Seawall

Service: Civil EngineeringService: Site DevelopmentService: Stormwater Management & Green InfrastructureIndustry: TransportationIndustry: GovernmentType: Civil Engineering+59 more

Water & Environmental Technologies, Inc.

Butte, MT

Founded on Practical Solutions.

WebsitePhone9 offices2 projects1 credentialsFounded 2000Size Estimate: 25-100 employees

Project: Parrot Site Superfund Cleanup, Butte

Service: Geoscience & Contaminant HydrogeologyService: Contaminant hydrogeologyService: Groundwater monitoringIndustry: Power GenerationIndustry: Oil & GasType: Civil Engineering+64 more