AECOM - Denver, CO; Lakewood, CO; Houston, TX; Pittsburgh, PA

Aegion Corporation - Houston, TX

All American Surveying - Gainesville, TX

Allied Corrosion - Marietta, GA; Houston, TX

Allseas Group S.A. - The Netherlands

Alpha Leak Detection & Pipeline Services - Kemah, TX

AMEC Foster Wheeler - Houston, TX

Anadarko Petroleum - The Woodlands, TX

Andeavor (Marathon Petroleum) - San Antonio, TX

Applied Consulting Field Services - Longview, TX

Arrow Surveying- Tunkhsnnock, PA

As-Built Modeling Services - Lumberton, MS

Ascent Geomatics Solutions - Denver, CO

Aspen Corrosion, Inc. - Houston, TX

Atlas Engineering - Houston, TX; New Orleans, LA; Aberdeen, Scotland

Atwell - Houston, TX; Pittsburgh, PA; San Antonio, TX

Audubon Field Solutions - Houston, TX; Tulsa, OK

Avery Technical Resources, Inc. - Odessa, TX

Baker Hughes - Houston, TX; Calgary, Canada; Edmonton, Canada

Bartlett & West - Bismarck, ND; Topeka, KS

Bechtel - Houston, TX; Frederick, MD

BL Companies - Pittsburgh, PA

Blue Mountain, Inc. - Burton, WV

Boardwalk Pipeline Partners LP - Houston, TX; Owensboro, KY

Borton-Lawson - Wilkes-Barre, PA

Bourland Surveying - Coldspring, TX

Bowman Consulting - Pittsburgh, PA

BP - Houston, TX; Calgary, AB Canada

Brown and Root Industrial Services (BRIS) - Baton Rouge, LA; West Monroe, LA

Buckeye Partners, L.P. - Houston, TX

Burns & McDonnell - Houston, TX; Kansas City, MO

Burrow Global Services - Houston, TX

C.H. Fenstermaker & Associates, Inc. - Lafayette, LA; New Orleans, LA; Nashville, TN; Houston, TX

Cadd Data, Inc. - Guaynabo, P.R.

Campos EPC - Denver, CO

CAMS Trident - Baytown, TX

CAM Integrated Solutions - Houston, TX; Denver, CO

Cardno Inc. - Houston TX

Carnegie Strategic Design Engineers, LLC - Houston, TX; Pittsburgh, PA

Caw Consultants - Mason, TX

CCI Inc. - Houston, TX; Cochrane, AB, Canada

CEI Engineering Associates, Inc. - Bentonville, AR

CEM Resources, Inc. - Houston, TX; Fellsmere, FL

Centro Resources - Fort Worth, TX

Centurion Pipeline - Houston, TX

CH2M (Jacobs) - Houston, TX; Denver, CO; Bellevue, WA; Corvallis, OR; Santa Anna, CA;

Chenault Consulting, Inc. - Farmington, NM

Cheniere Energy - Houston, TX

Chesapeake Energy - Fort Worth, TX; Horseheads, NY; Oklahoma City, OK; San Antonio, TX

Chester Engineers - Moon Township, PA

Chevron - Houston, TX

Chippewa Resources - Minot, ND

Cimarex - Denver, CO; Tulsa, OK; Midland, TX

Cimarron Engineering, Ltd. - Calgary, AB, Canada

Civil Engineering Consultants - San Antonio, TX

Civil & Environmental Consultants, Inc. - Bridgeport, WV

CobbFendley - Houston, TX

Connect Engineer - Calgary, AB, Canada

ConocoPhillips - Houston, TX

Consolidated Contractors Company - Athens, Greece; Brisbane, Australia; Dubai, U.A.E

Contract Land Staff - Sugar Land, TX

Cornerstone Engineering Services - Scarborough, ME

Corrosion Service - Ontario, Canada

CountryMark - Indianapolis, IN

CPP - Shanghai, China

Crafton Tull - Conway, AK

Crestwood Midstream Partners LP - Houston, TX

Crimson Pipeline - Long Beach, CA

Cross Texas Land Services - Mason, TX

CSD Engineers LLC - Houston, TX; Pittsburgh, PA

D3 Survey and Mapping - Ft. Worth, TX

Damian & Associates - Freeport, TX

Datapoint Surveying & Mapping - San Antonio, TX

Dawood Engineering, Inc - Sturbridge, MA

DCP Midstream - Houston, TX

Denbury Resources, Inc. - Plano, TX

Diversified Infrastructure Services, Inc. - Madison, WI

Devon Energy - Houston, TX; Oklahoma City, OK

Downtown Design Services Inc. - Denver, CO; Tulsa, OK

Doyle & Wachtstetter, Inc. - Clute, TX

The EADS Group - Somerset, PA

EDM Services - Simi Valley, CA

EMC, Inc. - Grenada, MS

EN Engineering - Woodridge, IL

Ener-Data - Houston, TX

Enable Midstream Partners, LLC. - Oklahoma City, OK

Enbridge - Houston, TX; Superior, WI; Edmonton, Alberta, Canada

Encompass Energy Services, LLC - Houston, TX

Energy Land & Infrastructure - Nashville, TN

Energy Transfer - Houston, TX

Engineering Service - Jackson, MS

ENGlobal - Houston, TX; Tulsa, OK

EnSite USA - Houston, TX; Versailles, KY

Enterprise Products Partners L.P. - Houston, TX

Equitrans Midstream - Pittsburgh, PA

Equinor (Statoil)- Houston, TX

Equinox Engineering Ltd. - Calgary, AB, Canada

Equistar Chemicals - Houston, TX

Erickson Contract Surveying - Sidney, MT

Ericsson - Plano, TX; Santa Clara, CA

ERM Group, Inc - London, United Kingdon

Excel Midstream - Houston, TX

exp Global Inc. - Houston, TX; Tulsa, OK

Farnsworth Group - Houston, TX

Fisher Associates - Buffalo, NY

Fluor - Houston, TX; Camberley, UK; Trinidad; Calgary, AB, Canada

Frontier Surveying Company - Fort Worth, TX

FSC, Inc. - Ft. Worth, TX

Fugro Chance, Inc. - Houston, TX

G2 Partners, LLC - Houston, TX

GAI Consultants - Homestead, PA

Ganem & Kelly Surveying, Inc. - Point Comfort, TX

Gateway Services Group - Fort Worth, TX

Geophysical Data Management, Inc. - Dallas, TX

GeoTerra Integrated Resource System Ltd - Prince George, BC, Canada

Golden Field Service - Tulsa, OK

Golder Associates - Calgary, AB, Canada

Gulf Interstate Engineering - Houston, TX

Gullett - Houston, TX

Halff Associates, Inc. - Forth Worth, TX; Midland, TX

Hanson Survey - Houston, TX

Mott MacDonald - Birmingham, AL; Hadley, MA; Milburn, NJ; Austin, TX; Houston, TX

Halker Consulting - Englewood, CO

Herbert, Rowland, & Grubic, Inc. - Cranberry Township, PA

Hiland Partners (Kinder Morgan) - Enid, OK

Holland Engineering - Holland, MI

Howland Engineering & Surveying Co. - Laredo, TX

Hunt, Guillot & Associates Pipeline Services, LLC - Ruston, LA

Ingenieria Dennis - Mexicali B.C., Mexico

Integrated Geomatics - Calgary, AB, Canada

Integrity EPC - Parker, CO

Integrated Pipeline Services, Inc. - Canonsburg, PA; Tulsa, OK

Jacobs Engineering Group, Inc. - San Antonio, Austin, & Fort Worth, TX

JN Services - Hudson Oaks, TX

JHA Companies - New Milford, PA

John Chance Land Surveys, Inc. - Lafayette, LA

Johnston-Vermette - Montreal, CA

JTAM Engineering - Houston, TX

KBR - Houston, TX; Brisbane, Australia

Kestrel Engineering, Inc. - Houston, TX

Kinder Morgan - Houston, TX; Lakewood, CO; Orange, CA

Kleinfelder - San Diego, CA

KLJ - Bismarck, ND

L&S Surveying - San Fernando, Trinidad

Lake Superior Consulting - Duluth, MN

Lamb-Star Engineering - Plano, TX

Landmark Surveying & Engineering - Bakersfield, CA

Landmark Survey and Mapping - Washington, PA

Larson Design Group - Williamsport, PA

Legacy Integrity - Tulsa, OK

Lauren Services - Calgary, AB, Canada

Link Field Services - Mineral Wells, TX

LJA - Beaumont, TX

Lotus Midstream - Sugarland, TX

LT Mapping Services, Inc. - Tulsa, OK

LW Survey - Denver, CO; Duluth, MN; Tulsa, OK; Lafayette, LA; Calgary, AB, Canada

LyondellBasell Industries - Houston, TX

Lythix - Midland, TX

M&H Energy Services - Lafayette, LA; Houston, TX

Markwest (Marathon Petroleum) - Denver, CO; Tulsa, OK

MATCOR, Inc. - Chalfont, PA

Maverick Engineering - Houston, TX

McClure Engineering - Clive, IA

McElhanney Geomatics Engineering - Calgary, AB, Canada

Merestone Surveying, LLC - Andover, KS

Meridian Surveying and Mapping - Houston, TX

Meridian Surveys - Saskatoon, SK, Canada

Messinger & Associates - Bastrop, LA

Michael Baker Jr., Inc. - Houston, TX

MidAmerican Energy - Omaha, NE

MKEC Engineering - Wichita, KS

Morris P. Herbert, Inc. - Baton Rouge, LA; Houma, LA; Houston, TX

Mountain Valley Pipeline, LLC - Pittsburgh, PA

National Pipeline Services, LLC - Mt. Pleasant, MI

Northern Natural Gas - Omaha, NE

Novara GeoSolutions - Norwell, MA

NTB Associates, Inc. - Shreveport, LA

Open Range Field Services, LLC - Boerne, TX

Opus Stewart Weir - Sherwood Park, Alberta

Oxy - Houston, TX; Midland, TX

Pelican Energy Partners - Houston, TX

Percheron, LLC - Katy, TX

Petersen Engineering, Inc.  - Indianapolis, IN

PetroFac - London SW1Y 6HH, UK

Petro IT - Houston, TX; New Delhi, India

Pipeline Land Services - Wichita Falls, TX; San Antonio, TX

Pipeline Project Services - West Monroe, LA

Plains All American Pipeline - Houston, TX

Plantation Pipeline Company - Atlanta, GA

Point Engineering - Port Harcourt Rivers State, Nigeria

Prime Energy Services - Houston, TX

Primoris Engineering - Houston, TX

Project Consulting Services - Houston, TX; Metaire, LA; Atlanta, GA

Protech EIS - Hardinsburg, KY

QPSE - Tulsa, OK

R Squared - Monroe, LA

Raba Kistner Infrastructure, Inc. - Dallas, TX

Rapid Response Project Limited - Calgary, AB, Canada

Republic Field Services - San Angelo, TX

Rooney Engineering - Centennial, CO

Rose Rock Midstream, L.P. - Oklahoma City, OK

Russell Corrosion - Columbia, MD

S&B - Houston, TX

Samuel Engineering, Inc. - Greenwood Village, CO

SemGroup Corp - Salisbury Plain, OK

setld - Houston, TX

SGC Engineering - Westbrook, ME

Shafer, Kline, & Warren, Inc. - Kansas City, MO; The Woodlands, TX; Tulsa, OK

SNC Lavalin - Calgary, AB, Canada

Solaris Management Consultants Inc. - Surrey, B.C. 

Southern Design Cadworks - Houston, TX

Spartan Engineering - Tulsa, OK

Spec Services - Orange County, CA

Spectra Energy (Enbridge) - Houston, TX

Stantec - Buckhannon, WV; Edmonton,AB, Canada

Strike, LLC - The Woodlands, TX

Structural Integrity - Centennial, CO

STV, Inc. - Douglassville, PA

Summit Midstream - Houston, TX; Denver, CO; Grand Prairie, TX

Sunoco, Inc. (Enbridge) - Houston, TX

Superior Appalachian Pipeline - Canonsburg, PA

Survey and Mapping, LLC (SAM) - Austin, TX

Tablerock Survey - Denver, CO; The Woodlands, TX

Tallgrass Energy - Lakewood, CO

Tatweer Petroleum - Awali, Kingdom of Bahrain

T. Baker Smith, Inc. - Houston, TX; Houma, LA

T.G. Mercer - Overland Park, KS

Technical Design Services - Duluth, MN

Territorial Landworks, Inc. - Missoula, MT

Thrasher Engineering - Bridgeport, WV

Three Streams Engineering Ltd. - Calgary, AB, Canada

TIMS Group - Pearland, TX

Titan Corrosion - Tomball, TX

TMI Solutions, LLC - Houston, TX; George West, TX

Topographic - Pampa, TX

TC Energy (TransCanada) - Houston, TX; Calgary, AB, Canada

Transglobal Services, LLC - Fort Worth, TX

Trans Adriatic Pipeline (TAP) - Greece, Albania, Italy

Trestles, LLC - Goodlettsville, TN

TRC Solutions - Orange County, CA

Trico Survey & Mapping - Bloomington, IN

Total Infrastructure Management Solutions (TIMS) - Pearland, TX

Tucker Energy Solutions - Pasadena, TX

Uintah - Vernal, UT

Universal Geomatic Solutions - Calgary, AB; Edmonton, AB

Universal Pegasus International - Houston, TX; Lafayette, LA; Calgary, AB, Canada

Universal Survey and Mapping - Tulsa, OK

Upside Engineering - Calgary, AB, Canada

Valero Energy - San Antonio, TX

Vanasse Hangen Brustlin, Inc. - Watertown, MA

Virtual GIS - Duluth, MN

Wayne Acree, P.L.S., Inc. - West Monroe, LA

Weisser Engineering & Surveying - Houston, TX

West Company of Midland, LLC - Midland, TX

Westwood - Eden Pairie, MN

Whiteley Oliver - Beaumont, TX

William H. Smith & Associates - Grand Junction, CO

Williams - Tulsa, OK

Wilson & Company, Inc. - Phoenix, AZ; Corpus Christi, TX; Salina, KS

Wood. - Houston, TX

Worley - Houston, TX; Calgary, AB, Canada

WSP Canada, Inc. - Calgary, AB, Canada

Xcel Energy - Denver, CO

Xcl Midstream - Canonsburg, PA

Zion Engineering - Greenwood Village, CO