A.Y. McDonald Mfg. Co.
AE2S
American AVK Company
American Ductile Iron Pipe
American Flow Control
American Structures, Inc.
A-Tech Sewer Cleaning/Video Inspect.
Baker Manufacturing Company
Banner Associates, Inc
Barco Municipal Products, Inc.
Bartlett & West Engineers, Inc.
Benders Sewer & Drain
Braun Pump & Controls, Inc.
Butler Machinery Co.
Caldwell Tanks, Inc.
Carstensen Contracting, Inc.
Central Electric Cooperative, Inc.
CETEC Engineering Services, Inc.
Chittim, Jay D.
Chlorinators Incorporated
Clark Engineering Corporation
Clow Valve Company
Curb Box Specialists, Inc.
Dakota Pump & Control, Inc.
Dakota Pump, Inc.
Dakota Security Systems, Inc
Dakota Supply Group
DGR & Associates Company
Ditch Witch of SD, Inc.
DOWL HKM
Ductile Iron Pipe Research Association
East River Electric Power Coop.
Eatherly Constructors, Inc.
Electric Pump
Ellis PE, Bradley E.
Energy Laboratories, Inc.
Engineered Systems, Inc.
Engineering America, Inc.
Farmers State Bank-Faith
First State Bank- Miller
Flexible Pipe Tool Company
FourFront Design, Inc.
GeoTek Engineering & Testing Services, Inc.
Glover & Helsper, P.C.
Hach Company
Harco Fittings
Hawkins Water Treatment Group, Inc.
H-D Electric Cooperative
HD Supply Waterworks
HDR, Inc.
Houston Engineering, Inc.
Howalt-McDowell Insurance, Inc.
Howard R. Green Company
Hurco Technologies, Inc.
In Control Inc.
Infrastructure Products, Inc.
Infratech
Johnson Brothers Excavation, Inc.
Kadrmas Lee & Jackson
KLM Engineering, Inc.
Lammers, Kleibacker & Brown, LLP
Larson Data Communications
Layne-Western Company, Inc.
Leggette, Brashears & Graham, Inc.
M & M Tank Coating Company
Maguire Iron, Inc.
McCready, Ron
MicroFix, Inc.
Mid America Meter, Inc.
Midco Diving & Marine Services, Inc.
MidContinent Testing Laboratories, Inc.
Milbank Winwater Works
Mishler Sales Inc
Missouri Sedimentation Action Coalition
Mooney & Associates, Inc.
Moreau Grand Electric Coop., Inc.
Morrison-Maierle, Inc.
Mueller Company
Municipal Pipe Services, Inc.
Nitteberg Construction Company
Northern Pipe Products, Inc.
Northern Water Works Supply, Inc.
Northwest Pipe Fittings, Inc.
Northwestern Power Equipment Co., Inc.
Owens Inspection Services, LLC
Pittsburg Tank & Tower Co., Inc.
Pohlman, Ken
Powertech (USA) Inc.
Quality Flow Systems
Quality Services, Inc.
Red Flint Sand & Gravel
Risk Administration Services, Inc.
Romac Industries, Inc.
Sargent Drilling
Schmit-Greteman Assoc., Inc.
Schmucker, Paul, Nohr & Associates
Schu/Marketing Associates, Inc.
SD Rural Electric Association
SEMS Technologies, LLC
Sensus Metering Systems
Seven Star Enterprises LLC
Short Elliott Hendrickson, Inc.
Siemens Water Technologies Corp.
Sioux Valley Environmental
SJE - Rhombus Controls
Solar Bee, Inc.
South Dakota Campground Owners Association
South Dakota Section AWWA
South Dakota State Health Laboratory
Southeastern Electric Cooperative, Inc.
Sweeney Controls Company
The Ford Meter Box Co., Inc.
Thein Well Company, Inc.
Titan Machinery
Tonka Equipment Company
Treatment Resources, Inc.
Ulteig
USA BlueBook
USA Tank
Vessco, Inc.
Visu-Sewer Clean & Seal, Inc.
Water Environ. Engineering Research Cntr – SDSU
West Central Electric
Weston Engineering, Inc.
Widseth Smith Nolting & Associates, Inc.