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 Agricultural Laboratory Inc. (NE)​
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 Drinking Water Administrators​
Association of State and Territorial Health Officials
Automotive Oil Change Association

B
Barton Springs/Edwards Aquifer Conservation District (TX)
Benzie Conservation District (MI)
Big Bear Lake (CA) Department of Water​
Bison Pumps
Biotech Laboratory (Chesterfield, Virginia)​
Branch Conservation District (MI)
Bridger Drilling Inc. (MT)
Bridgewater Township Environmental Commission (NJ)
Buchanan County Environmental Health (IA)  
Bureau, Putnam & Marshall County Health Departments​
Butte County (CA) Department of Water and ResourceConservation

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
Dayton Department of Water​
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
EOS Remediation

F
Florida Department of Health, Bureau of EnvironmentalHealth
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
Geosyntec​​
Green Earth Design/Sandra Frost (CA)​
Ground Water Protection Council
Groundwater​
Groundwater Canada​​
Groundwater Foundation (NE)
Groundwater Monitoring & Remediation​​
Groundwater Resources Association of California​​

H
Heron Instruments Inc.
HydroG Resources Group (ON)

I
Idaho Department of Environment​al​ Quality​
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
Kansas University School of Medicine-Wichita​
Kendall County Health Department (IL)
Kocher's Water Pumps & Tanks Inc. (PA)

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

M

Macon County Environmental Health (NC) ​      
Maine Groundwater Association
Maine Public Health 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)
​Metropolitan Planning Council
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 Golf Course Superintendents’ Association​​
Minnesota Water Well Association
Mississippi Groundwater Association
Missouri Water Well Association
Montana Water Well Drillers Association​
Moore's Well Drilling

N
National Association of County and City Health Officials
National Environmental Health Association​
National Rural Health Association
National Tribal Water Center​​
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, Mel
North Carolina Department of Environmental Quality​
North Carolina Division of Water Resources​
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
Ontario Ground Water Association​​
Oregon Domestic Well Safety Program​
Oregon Drinking Water Services​
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
SafeWell Corp. (MA)​
San Juan Basin Public Health (CO)
Save Palo Alto's Groundwater​
SCARCE​
Sharma, Vikas
South Carolina Ground Water Association
South Central Connecticut Regional Water Authority​
South Dakota Well Drillers Association
Southeast Drilling​ (NM)
Southern Ogallala Conservation & Outreach Program​

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
Texas Groundwater Protection Committee ​​
Tippecanoe County Health Dept. (IN)

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

V
Valerio, Francheska
Vermont Ground Water Association
Virginia Department of Health, Office of Environmental Health Services​
Virginia Department of Health​, Private Well Program ​
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 Journal​
Water Well Drilling Contractors and Pump InstallationContractors (WY)
WellStar Groundwater Technologies​
West Virginia Water Well Drillers Association
Will County Health Department​
Wisconsin Water Well Association (WI)​
Wyoming Water Well Association​​