A
Alabama Ground Water Association
Alaska Water Well Association
Alcona and Iosco Conservation Districts (MI)
Allegan Conservation District (MI)
Allen's Well Drilling, Inc. (FL)
American Association of Drinking Water Administrators 
American Geosciences Institute
Applied Process Equipment, Inc. (AZ)
Aqua Well & Pump (WI)
Arenac conservation district (MI)
Arizona Water Resources Research Center, University of Arizona
Arizona Water Well Association​
Arkansas Water Well Contractors Association
Association of State and Territorial Health Officials 
Automotive Oil Change Association

B
Barton Springs/Edwards Aquifer Conservation District (TX)
Benzie Conservation District (MI)
Bison Pumps
Branch Conservation District (MI)
Bridger Drilling Inc. (MT)
Bridgewater Township Environmental Commission (NJ)
Buchanan County Environmental Health (IA)  
Butte County (CA) Department of Water and Resource Conservation 

C
Calhoun County Public Health (IA)
California Groundwater Association
Capital Well Clean Water Center (NH)
Cass County Conservation District (ND)
CDM Smith
Charlestown Township (PA)  
Chatham County (NC) Public Health Department
Colorado Water Well Contractors Association
Colts Neck Township (NJ)
Connecticut Water Well Association
County of Chester (PA)
Cummings Well and Pump Services Inc. (MA)

D
Dodge County Human Services and Health Department (WI)
Domer’s (FL)
Dubois-Crowheart Conservation District (WY)​

E
Eaton Conservation District and the Michigan Water Stewardship Program (MWSP)
Edwards Aquifer Authority (TX)​
Empire State Water Well Drillers Association

F
Florida Department of Health, Bureau of Environmental Health ​
Florida Ground Water Association
Franklin Electric (IN)
Fredericktowne Labs, Inc. (MD) 
Ft. Bend County (TX) Environmental Health Department​
Friends of the Central Sands (WI)
Frontier Associates (TX)​
Fuller Supply Company (MI) 

G
Georgia Association of Groundwater Professionals
Green Earth Design/Sandra Frost (CA)​
Ground Water Protection Council
Groundwater Foundation (NE)

H
Heron Instruments Inc.
HydroG Resources Group (ON)

I
Idaho Ground Water Association​
Illinois Association of Groundwater Professionals (IL)
Illinois State Water Survey
Indiana Ground Water Association
Ingleside Engineering & Construction, Inc. (MN)
International Association of Hydrogeologists US National Chapter
International Bottled Water Association​
Iowa Association of Municipal Utilities  
Iowa Department of Natural Resources (IA)
Iowa Environmental Health Association​
Iowa Water Well Association
Irrigation Association​

J
Jackson County Conservation District (MI)
Jefferson Co. Environmental Health (IA)

K
Kansas Ground Water Association
Kendall County Health Department (IL)
Kocher's Water Pumps & Tanks Inc. (PA)

L
Lake County Public Health Agency/Environmental Health (Lake County Colorado) (CO)
Lincoln County Environmental Health (NC)
Louisiana Ground Water Association

M

Macon County Environmental Health (NC) ​      
Maine Groundwater Association
Maryland-Delaware Water Well Association
Massachusetts Department of Environmental Protection (MA)
Master Gardeners of Mariposa County (CA)
McLean County (IL) Health Department​
Mesa County Health Department (CO)
Miami County Public Health (FL)
Michigan Association of Conservation District (MI)
Michigan Ground Water Association
Michigan Water Stewardship Program 
Midland Conservation District (MI)
Midwest Environmental Advocates (WI)
Minnesota Water Well Association
Mississippi Groundwater Association
Missouri Water Well Association
Montana Water Well Drillers Association

N
National Association of County and City Health Officials
National Environmental Health Association​
National Rural Health Association
Nebraska Well Drillers Association
Nevada Groundwater Association
New Hampshire Water Well Association
New Jersey Ground Water Association (NJ)
New Mexico Environmental Public Health Tracking Program
New Mexico Ground Water Association
North Carolina Ground Water Association
North Dakota Well Drillers Association
Nuco Pump and Well Services (FL)

O
Office of Surface Mining. (DC)
Ohio AgriBusiness Association (OH)
Ohio Turfgrass Foundation
Ohio Water Well Association
Oklahoma Ground Water Association
Oregon Ground Water Association

P
Pavan Bhukya Kumar, student, National Institute of Technology (India) 
Peerless-Midwest Inc. (IN)
Penn State Extension Water Team (PA)
Pennsylvania Ground Water Association
Private well owner (NM)
Putnam & Marshall County (IL) Health Departments 

R
Rhode Island Ground Water Association
Richland County Sanitarian (MT)
Rural Community Assistance Partnership ​      

S
San Juan Basin Public Health (CO)
South Carolina Ground Water Association
South Dakota Well Drillers Association

T
Target Range Sewer and Water District (MT)
Taylor County Environmental Health (IA)
Tennessee Water Well Association
Texas A&M University
Texas Ground Water Association
Tippecanoe County Health Dept. (IN)

U
U.S. Environmental Protection Agency
U.S. Geological Survey
University of Maine Cooperative Extension - Oxford County (ME)
Utah Ground Water Association

V
Vermont Ground Water Association
Virginia Department of Health​
Virginia Rural Health Association (VA)
Virginia Tech and Virginia Cooperative Extension (VA)
Virginia Water Well Association

W
Washington County Health Department (IL)
Washington State Ground Water Association
Water Quality Association (IL)
Water Systems Council (DC)
Water Well Drilling Contractors and Pump Installation Contractors (WY)
West Virginia Water Well Drillers Association
Wisconsin Water Well Association (WI)​
Wyoming Water Well Association​