A. Morton Thomas
A. Pyburn & Sons, Inc.
AB Construction
ABC Cutting Contractors
Able Detection Service
Above Net
Accurate Locating Services
Actus Lendlease
ADCO Underground Services
Advanced Energy Systems, OR
Airy’s Inc., IL
Aka Energy, CO
Alameda Municipal Power
Alaska Digline
Alderwood Water & Wastewater
Alma Telephone Company
American Leak Detection
American Ordnance, IA
American Patriot Environmental Services
American Surveying & Engineering
Anadarko Petroleum
Apollo Geophysics
Aquarion Water Co.
Archibeque Land Consulting
Ardmore Assoc.
Argonne National Laboratory
Arguello Partners
Arizona American Water
Arizona City Sanitary District
Arizona DOT
Arizona Public Service
Arizona State University
Arkansas State University
Art’s Electric
Assoc. IL Elec. Coops.
Association of California Water Agencies/Joint Powers Insurance Authority (ACWA/JPIA)
Athens-Clark County, GA
Atlantic Leak Detection & Utility Locating LLC
Augusta Utilities, GA
Austin Brockenbrough & Assoc.
Aux Sable Liquid Products
B & G Oilfield Services
B&H Maintenance & Construction, TX
Badger Electric
Baraga Telephone Company
Baron Marlow
Battele Energy Alliance
Bemis Utility Location Services LLC
Bennington College
Berkshire Gas
Bess Test Lab
Big Bear Lake DWP
Big West Bakersfield Refinery
Binkley & Barfield, Inc.
BJAAM Environmental
Black Bear, PA
Bloodhound, Inc.
Blue Sky Management, MD
BMWC Constructors, Inc.
Board of Water & Light, MI
Bolton Fencing & Construction
Bonneville Construction SE
Bowling Green Municipal Utilities
Bowman Constructing
Bomar Mobile Welding, CA
Border Marketing, AZ
BP Cooper River Site
BP Pipeline
Brainerd Public Utilities, MN
Breitburn Energy, CA
Buckeye Pipeline, IA
Bureau of Indian Affairs
Burnside Water District, IL
Butler County, OH
BWXT Pantex
C & S Solutions, GA
Cable Master Inc.
Califf Surveying & Mapping
Calpine CPN Pipeline
Calvert Cliff Nuclear Power Plant, MD
Camp Pendleton
Canby Telecom, OR
Canyonlands National Park
Capitol Oil Corp.
Carcon Industries
Cardno TBE
Carleton College, MN
Carlton College, NM
Cascade Claim Service, OR
Cascade Natural Gas
Casper College
Cedar Falls Utilities
CenterPoint Energy
Central Arizona Project
Central Florida Gas
Centralia City Light
Centurion Pipeline
CH Engineering
Charter Township of Waterford, MI
Chatsworth Water Commission
Chelan County, WA Public Utility Dept.
Cherryland Electric Cooperative
Chicago Transit Authority
City of Adelanto, CA
City of Albany, GA
City of Ashland, GA
City of Ashville, NC
City of Atlanta, GA
City of Auburn Hills, MI
City of Aurora, IL
City of Banning, CA
City of Batavia, IL
City of Bloomington, IL
City of Bonney Lake, WA
City of Boulder, CO
City of Brawley, CA
City of Breese, Il
City of Burbank, CA
City of Burton, MI
City of Bushnell, IL
City of Carbondale, IL
City of Centralia, IL
City of Centralia, WA
City of Champaign, IL
City of Chandler, AZ
City of Chanhassen, IL
City of Chino, CA
City of Coalinga, CA
City of Colchester, IL
City of College Park, GA
City of Colona, IL
City of Coquitlam, BC
City of Corinth, MS
City of Corona, CA
City of Covington, GA
City of Creal Springs, IL
City of Crystal Lake, IL
City of Cumming, GA
City of Cupertino, CA
City of Danbury, CT
City of Duval, WA
City of East Point,MI
City of Eatonton, GA
City of El Mirage, AZ
City of Elgin, IL
City of Elmhurst, IL
City of Eugene, OR
City of Evanston, IL
City of Everett, WA
City of Fairborn, OH
City of Falls Church, VA
City of Farmington, IL
City of Fitchburg, MA
City of Flagstaff, AZ
City of Flora, IL
City of Forest Grove, OR
City of Frankfort, IL
City of Fullerton, CA
City of Fulton, IL
City of Geneseo, IL
City of Glendale, AZ
City of Gold Hull PWD, OR
City of Grand Tower, IL
City of Grants Pass, OR
City of Greenville, IL
City of Griffin, GA
City of Hickory Hills, IL
City of Highland Park, IL
City of Highland, IL
City of Hometown, IL
City of Hamilton, IL
City of Kennewick
City of Kings Mountain, NC
City of Knoxville, TN
City of La Habra, CA
City of Lansing, MI
City of Las Cruces, NM
City of Lawrenceville, GA
City of Loganville, GA
City of Lordsburg, NM
City of Lynchburg, VA
City of Macomb, IL
City of Mahtomedi, MN
City of Marietta, GA
City of McHenry, IL
City of Mesa, AZ
City of Mesa, AZ
City of Milwaukee, WI
City of Modesto, CA
City of Morris, IL
City of Moscow, IL
City of Mountain View, CA
City of Naperville, IL
City of Newport Beach, CA
City of Nokomis, IL
City of Norman, OK
City of Oak Forest, IL
City of Olympia, WA
City of Oregon City, OR
City of Ottawa, ON
City of Pacifica, CA
City of Palo Alto, CA
City of Palos Heights, IL
City of Peoria, AZ
City of Piqua, OH
City of Port Moody, BC
City of Prescott, AZ
City of Ramsey, MN
City of Red Bud, IL
City of Redmond, WA
City of Richland, WA
City of Rock Falls, IL
City of Rocky Mount, NC
City of Rolling Meadows, IL
City of San Jose Environmental Services
City of Santa Ana, CA
City of San Luis, AZ
City of Sandwich, IL
City of Shoreview, MN
City of Shorewood, MN
City Of Show Low, AZ
City of South Haven, MI
City of Springfield, OR
City of St. Paul, MN
City of Sterling, IL
City of Superior, WI
City of Surprise, AZ
City of Tampa, FL
City of Taylorville, IL
City of Thomasville, NC
City of Tifton, GA
City of Tigard, OR
City of Traverse City, MI
City of Tucson, AZ
City of Urbana, IL
City of Vancouver, WA
City of Vernon, CA
City of Villa Ricca, CA
City of Virginia Beach, VA
City of Washington, IL
City of Waterbury, CT
City of Waterloo, IL
City of Waukee, IL
City of Waynesboro, VA
City of Williamsburg, VA
City of Wilson, NC
City of Winder, GA
City of Woodridge, IL
City of Wooster, OH
City of Yorkville, IL
City of Zion, IL
City Scan Corp
City Utilities of Springfield, MO
Clark Edgar Rural Water, IL
Cleveland Utilities
Clinton Utilities Board
CMSI – Bell & Assoc.
Cobb Fendley and Assoc.
Cobra Concrete Cutting
Cobra Scanning Technologies
Colonial Williamsburg
Colorado Interstate Gas
Colorado Springs Utilities, CO
Communication Technology, IA
Community Services
Compliance Services
Connelly Electic, IL
Conoco Phillips Pipeline
Consolidated Elec. Coop.
Constellation Energy
Construction Skills Training Academy, UK
Consumers Energy
Cooper Nuclear Station
Copperhead Industries
Cornerstone Surveying & Engineering
County of Orange, CA
Coweta County Water, GA
Cox Communications
Craig A. Smith & Assoc.
Cross Valley Water Dist.
Cruz Brothers Locators
CT Natural Gas
Dakota Gasification
Dalhgren Naval Base
Daphne Utilities, AL
Davis Safety
Day & Zimmerman, KS
DayStarr Communications
DCP Mainstream
Dearborn Companies
Dekalb County, GA
DeKalb Fiber Optic, IL
Delaware Electric Coopoerative, DE
Delmarva Power, DE
Denbury Resources
Dept of Military Affairs – Volk Field
Department of Public Utilities, SC
Dig Safey, New York
Dig Smart of Maine
Ditch Witch
Dominion E. Ohio Gas
Dorchester County, SC
Double H Locates
Duke University
DuPage County, IL Public Works
DuPage Water Commission, IL
Dynasty Group Inc.
Dynegy Kendall Energy
DZ Atlantic, VA
East Valley Water District
Eastern Municipal Water Dist.
Easton Utilities, MA
Eclipse Network Services
EDA, Inc., FL
EDP Renewables, MN
Edwards AFB
Egan Electric
EGW Utilities
El Paso Natural Gas
Elite Inspection
Elk River Municipal Utilities
Ellijay Telephone, GA
Elverado Water District, IL
EnCana Oil & Gas USA Inc.
Enel North America
Energy Services of Pensacola
Engelberth Construction
Engineering Strategies Inc.
ENJ Contracting Inc.
Enterprise Producers
Environmental Design International
Environmental Probe Serv.
Environmental Work
EnXco Corporation
EON Climate & Renewables
ESG Operations
ESP Associates
Eugene Water & Electric Board, OR
Ever-Green Energy, WI
Eversource Gas, CT
F. Robert Bell and Associates
Faith Technology
Farmers Mutual Electric Company
Farnsworth Group
FES Honeywell
Fibertec Environmental
Firelands Electric, OH
First Call Services LLC, TN
Fisher Labs
Fitchburg Water Dept., MA
Fitzgerald Water, Light & Bond Commission
Fletcher-Reinhardt Co.
Florida Gas & Electric Corp.
Florida Power and Light
Florida Public Utilities
Flying J
Focus Corporation
Forkert Engineering & Surveying
Fortis Gas
Fountain Hills Sanitary District
Fox Point Water Utility
Fox River Water Reclamation District
Freeport McMoRan
Fromm Applied Technology, WI
Fulton County, GA
Gabes Construction
Gainesville Reg. Utilities
Gamesa Wind US, PA
Gas Technology Institute
Genesee County Water & Waste Services
Geomatics Consulting
GeoMet Operating Company
Georgia Power
GeoServe, Inc.
GeoTech Utility Locating LLC
Gila River Indian Community Utility Authority
Golden State Utility Co.
Golden State Water
Goodrich Petroleum
GPR One Call
Grafton Technologies
Grand Haven Board of Light & Power
Granite Construction
Gray Cliff Enterprises
Green Bay Metropolitan Water
Green Equipment
Greenhorne and O’Mara
Greenville Utilities
Gresco Utility Supply, Inc. AL
Groton Utilities
Ground Hound Detection Services Inc.
Groundwater & Environ. Serv.
Gulf South Pipeline
Haeger Engineering
Halifax EMC, NC
Hampton Roads Sanitary Dist., VA
Harris County, GA
Hawaii Geophysical Serv.
HBK Engineering
Heath Consultants
Henkels & McCoy
Hennessy Surveying
Highland IL Dept. of Public Works
Hired Guns LLC
Ho-Chunk Nation
Holes Inc.
Holland, MI BPW
Home Telephone, IL
Houston Rapid Transit
Hutchinson Utilities, MN
Hydro Physics of Albuquerque, NM
Hydrovac Excavating Inc.
Ianuzi & Romans Land Surveyors, NY
Iberdrola Renewables
Idaho National Laboratory
Idaho Transportation Department
IL Air National Guard
IL American Water, IL
IL State University, IL
IL Rural Water Assoc.
Imperial Irrigation District
IN Natural Gas Corp., IN
InDepth Utility Solutions
Indicom Electric Compnay
Infobahn Outfitters
Insight Communications
Instrument Technology Corp.
Interen, IL
Intermountain Construction
Iroquois Gas Transmission Company
Iroquois Gas Transmission System
Irvine Ranch Water District
ITC Instrument Technologies, CA
Jaca & Sierra Engineering, PR
JACK Contractor Services Inc.
James D. Nadeau LLC, ME
Janotta & Herner Inc., OH
Jemez Mountain Electric Co-op
Jerry Melton, CA
Joyner Keeney
Kaput & Associates
Kaufman Consultation
KDM Meridian
Kempen Remodeling, WI
Kern River Gas Transmission Company
Kerrville Public Utility Board
Keyspan Energy
Keystone Locating
Kiewit Energy
Kinder Morgan
King William County, VA
Kit Carson Electric Co-op
Know What’s Below Mid Mo, MO
Koch Pipeline
Kodiak Field Services
Koontz Bryant PC
KRW Consulting, Inc.
KS Turnpike Authority, KS
Laborers Union AGC
LaFollette Utilities
Lake Apopka Natural Gas District
Lake County Public Works, IL
Lake Hemet MWD
Lake Superior Consulting, CA
Land Design Inc.
LandTech Engineering & Suveying, TN
Lane County Public Works, OR
Lane Transit District, OR
Langan Eng. & Env. Services
Langley AFB
Lansing Board of Water, MI
Las Vegas Valley Water District
Lawrence :Livermore National Lab, CA
LCM Surveying & Engineering
Leaf River Telco, IL
Leak Locators of Montana
Lease Crutcher Lewis LLC, OR
Leech Lake Band of Ojibiwe
Leonore Mutual Telephone Company
Lewis University
Light Commission, Albany, GA
Lincoln Electric
Line Locators
Locating Unlimited
Lodi Gas Storage LLC
Logansport Muncipal Utilities
Long Creek Township, IL
Los Alamos National Lab, NM
Los Angeles Dept. Water & Power
LOTT Alliance, WA
Loudon County Sanitation Authority
Lucky’s Locating
M&W Utility Contractors
Macomb Public Works, IL
Madison Communications Inc., IL
Madison Gas & Electic, WI
Madison Telephone Co., IL
Maine Public Utilities Commission
Manatee County, FL
Manteno Veterans Home, IL
Maptech Inc., MS
Marathon Pipeline
Marietta Power, GA
Marietta Water, GA
Marine Corps Logistics Base, GA
Marseilles Telephone Company
Master Locators
McDonough Telephone Coop, IL
McTish, Kunkel & Associates, PA
MDS Warren Township Schools, IN
Meade Electric, IN
Melton & Sons, CA
Mello Construction Co Inc.
Meridian Locating
Merit Energy
Metamora Telephone Co.
Metro Engineering Solutions
Metro Water District of Salt Lake
Metropolition Washington Airport Authority
MI-Tech Services Inc.
Michael Surveying and Mapping PC
Midwestern GAs Transmission, IN
Midwest Surveys, Inc.
Milhouse Engineering
Miller Pipeline
Mineral Park Mine
Minnesota Dept. of Transportation
Minnesota Water District
Minnesota Zoo
MMR Constructors, CA
MN Office of Pipeline Safety
Montgomery Co. Sanitary Eng.
Monticello, MN School District
Moorpark College
Morristown Utility Systems
Moulton Niguel Water District
Mountain Home AFB
Mt. Pleasant, SC Waterworks
MTCO Communications, IL
MTE Communications
NStar Gas, MA
Nashville Electric Service, TN
National GPR Services, MN
National Grid
Natural Gas Pipeline Co.
Navajo Tribal Utility Authority
Navopache Electric Coop
New England Gas
New Mexico DOT
New Mexico State U.
New Water Green Bay
Newport News Public Utilities, VA
Nextera, MN
NH Public Utilities Commision
Nicor Gas
Nondestructive Testing
North American Field Services
North West Gas, MI
Northern Border Pipeline
Northern Kentucky University
Northern Tier Energy, MN
Northwest Metal Fab & Pipeline, OR
Northwestern University, IL
Norwich Public Utilities
Notre Dame Utilities, IN
NRG Energy Center Minneapolis LLC
NTH Consultants Ltd.
NuStar Energy LP, MN
Oak Lawn Water Department, IL
Occidental Permian
Oceanside Water Utilities
Ohio Rural Elec. Coops.
Ohio Valley Gas Corporation
Omi Communications, FL
On Target Utility Services
On The Spot Utility Resources, IN
One-Call Wyoming
Orange and Rockland Utilities
Orland Park Public Works, IL
Otterlake Water Commission, IL
Pacific Gas & Electric, CA
Overton Power District
Padre Dam Municipal Water Dist.
Panhandle Oil Field Services
Pantex Plant
Paragon RmG, IL
Paragould Light, Water and Cable
Parker & Sons, FL
Patrick Engineering, IL
Paulding County, GA
Paulding Putnam Elec., OH
PCM Inc.
PDI Construction
Penn State U.
Peoples Gas
Perley Cable, IL
Permian Anchors
Pesque Isle Electric & Gas Co-op
Petrelli Electric Inc.
Phoenix Solutions
Phoenix-Mesa Gateway Airport
Piedmont Natural Gas
Pierce County Utilities, WA
Pioneer Rural Electric, OH
Pima County, AZ
Pitt County Schools
Plains Pipeline
PM Enviromental Inc.
PNM Gas Serv.
Port of Grays Harbor
Port of Whitman
Portland Natural Gas Transmission System, ME
Portland Water Bureau, ME
Powell Clinch Utility District, TN
Powell Land Surveying
Prairie Energy Cooperative, IA
Prairie State Generating Company
Precision Contracting Services
Premier Utility Locating
Prince William County Public Schools
Prince William County, VA
Probe Utility Locating Inc., LLC, NC
Professional Community Management Inc.
ProMark Utility Locators
ProTek Locating
PSNC Energy
Public Service Company of New Mexico
Public Service Telephone
Purdue University
Pyramid Environmental and Engineering, NC
QA QC Engineering
Quality Contracting
Questar Gas
R.J. Devereaux
R.L. Coolsaet Construction, MI
Rabine Group, IL
Rainbow Municipal Water Dist.
Ramona Municipal Water District
Range Resources, PA
Rancho CA Water Dist.
Ratliff Construction
Regional Water Authority, CT
Remote Inspection Technologies
Rettew Associates, Inc., PA
Rhode Island Division of Public Utilities and Carriers
Ridge Tools, OH
Richardson Wayland, WV
Riggle Plumbing
Riggle Plumbing, WA
Riley Brothers, MA
Roberts Environmental Drilling Inc., MD
Rockford Water Dept., IL
Roderick Group, IL
Roosevelt Irrigation District
Rowe, Inc.
Rural Electric Convenience
RWI Construction Inc.
S & N Communications
S & ME, Inc.
S & N Utilities Services, VA
Safe2Core, FL
Safe Find
Safe Site Utility Services
Salt River Project
SAM, Inc.
Samsung Engineering and Construction
San Bernardino Valley Municipal Water District
San Diego County Water Authority
San Jose Regional Wastewater, CA
Sandhills Utility Services
Sandia National Labs
Sandy City Public Utilities, UT
Sangamon Valley Water, IL
Santa Ana Watershed, CA
Scan Plus Technology Detection
Schneider Electric, FL
Schonberg Research Corp.
Sebring Gas System Inc.
Security Builders
Seneca Resources
Seneca Light & Water, SC
Sevier County Electric System
Shambaugh & Sons, IN
Shasta Consulting Group Inc.
Shawnee Professional Services, IL
Shell Pipeline
Siena Engineering Group
Silver Lake Water & Sewer Dist.
Silver Star Communications
Sinclair Transportation Company
SMG Utility Locating, CA
SMSC Pubic Works, MN
Solomon Electric & Data, Inc., CA
South Central Laborers
South Eastern Survey
South Grand Canyon Sanitary District
Southern CT Gas
Southern Gas Association
Southern Illinois University
Southern Indiana Underground
Southwest Energy Solutions
Sprague Excavating Co., MD
Spring Valley Public Utilities
Springfield Utility Board, OR
Squaxin Island Tribe
SSC Regional Water Authority
St. Charles Community College
St. Cloud State University
St. Lawrence Gas
St. Paul Public Works, MN
St. Paul Regional Water (SPRWS)
Stacy and Witbeck, Inc.
Stanislaus County, CA
State Farm Insurance
State of Delaware, DE
State of Michigan
Staunton Water Dept., IL
Structure Scan
Subsite Electronics
SubSurface Instruments, WI
Sulphur Springs Valley Elec. Coop., AZ
Sunde Lan Surveying LLCS, MN
Sunoco Logistics
Superior Water
Sync Global Telecom
Synergy One Locating
Tallgrass Energy Partners LLC
Taylor Corporation
Telepak Networks, Inc.
Telephone & Data Systems
Telephone AT& S
Terasen Pipeline
Tesovo Logistics
Texas Meter & Device
Texas ReExcavation
TexMex, NM
The Chandler Group
The DySyn Group
The Galesburg Sanitary District, IL
The Industrial Company (T.I.C.)
The Ridge Tool Co.
The Rio’s Group
The Southern Company
The Underground Detective
The Wantman Group
Therma, CA
Thomasville Utilities
Three Rivers Park District, MN
Tidelands Oil Production
TJ Lambrecht Construction
Tocca Natural Gas
Toledo Tel
Topar Field Services
Town of Castle Rock, CO
Town of Clarkdale, AZ
Town of Fountain Hills, AZ
Town of Grosse Ile, MI
Town of Jackson, WY
Town of Marana, AZ
Town of Oro Valley, AZ
Town of Queen Creek, AZ
Town of Warrenton, VA
Trade Tool & Supply
Traverse City L&P
Trico Electric Cooperative
Triple E Services
Tri-State GPR, PA
Truitt Oilfield
Tualatin Valley Water Distric, OR
Turlock Irrigation District
U.S. Marine Corps
UC/Synergentic, GA
Ultra Engineering Contractors
Underground Detection Services
Underground Imaging Technologies, NY
Underground Locators, Inc.
Underground Solutions
Unibar Damage Prevention
Union Rural Electric Coop.
Uniplan Engineering Inc., CA
UniSource Energy Services
UniSource Gas Co.
United Illuminating
United States Navy
United Water Services
Unitil Fitchburg Gas & Electric
Univ. of Tennesse Chattanooga
Univ. of WY
University of Arizona
University of Central Florida, AL
University of Cincinnati
University of Colorado
University of Illinois
University of Michigan
University of North Carolina
University of Oregon
University of Southern California
University of Tennessee Chattanooga, TN
UNS Electric
URS Corporation
USA Bluebook
USMA@West Point
Utah State Univ.
Utiliquest, VA
Utility Crane & Equipment
Utility Locators LLC, TN
Utility Sales Assoc.
Util-Locate, CA
V3 Companies
VacUDigga, Australia
Valparaiso University
Van Note Harvey Associates
Vanderwalker Land Surveyors
Vectren Energy Delivery, IN
Ventura Water, CA
Veolia Water
Vermont Gas Systems Inc.
Victor Valley Wastewater Reclamation Authority
Vika, Inc.
Village of Bolingbrook, IL
Village of Bradley, IL
Village of Bridgeview, IL
Village of Channahon, IL
Village of Clarendon Hills, IL
Village of Dalton City, IL
Village of Downers Grove, IL
Village of Elwood, IL
Village of Fox Point, WI
Village of Frankfort, IL
Village of Glen Ellyn, IL
Village of Glencoe, IL
Village of Gurnee, IL
Village of Hanover Park, IL
Village of Hoffman Estates, IL
Village of LaGrange, IL
Village of Los Lunas, NM
Village of Manteno, IL
Village of Midlothian, IL
Village of Milan, IL
Village of Mundelein, IL
Village of Niles, IL
Village of North Aurora, IL
Village of Shorewood, IL
Village of Wauconda, IL
Virginia Public Utilities, MN
Virginia Utilities Protection Service
Volk Field, Air National Guard Base
W.S.U. Utilities
W.T. Ballard
WA State Dept of Transportation
Wallace Montgomery, MD
Walsh Construction
Washington County Water Department, IL
Washington Electric Coop, OH
Washington State Dept. of Transportation
Water One
We Energies, WI
West Locating
Western Illinois University, IL
Western Municipal Water District
Westville Gas & Water, IL
Wheatland REA
Whiting Oil & Gas
Whitman College
Whittenburg Land Survey
Williams NWP
Wilson Energy, NC
Wolverton & Associates
Woodard Curran, GA
Woolpert, Inc.
W-T Land Surveying, IL
Xcel Energy
XTO Energy
Yankee Gas
Yorba Lynda Water Dist.
Yuma County