Alabama
Alabama Onsite Wastewater Association
334/396-3434
Arizona
Arizona Onsite Wastewater Recycling Association
928/443-0333
Arkansas
Arkansas Onsite Wastewater Association
California
California Onsite Wastewater Association
530/513-6658
Colorado
Colorado Professionals in Onsite Wastewater
720/626-8989
Connecticut
Connecticut Onsite Wastewater Recycling Association
860/267-1057
Delaware
Delaware On-Site Wastewater Recycling Association
Florida
Florida Onsite Wastewater Association
321/363-1590
Georgia
Georgia Onsite Wastewater Association
706/407-2552
Georgia F.O.G. Alliance
Idaho
Onsite Wastewater Association of Idaho
208/664-2133
Illinois
Onsite Wastewater Professionals of Illinois
Indiana
Indiana Onsite Waste Water Professionals Association
317/889-2382
Iowa
Iowa Onsite Waste Water Association
515/225-1051
Kansas
Kansas Small Flows Association
913/594-1472
Kentucky
Kentucky Onsite Wastewater Association
855/818-5692
Maine
Maine Association Of Site Evaluators
Maine Association of Professional Soil Scientists
Maryland
Maryland Onsite Wastewater Professionals Association
443/570-2029
Michigan
Michigan Onsite Wastewater Recycling Association
Michigan Septic Tank Association
989/808-8648
Minnesota
Minnesota Onsite Wastewater Association
888/810-4178
Missouri
Missouri Smallflows Organization
417/739-4100
Nebraska
Nebraska On-site Waste Water Association
402/476-0162
New Hampshire
New Hampshire Association of Septage Haulers
603/831-8670
Granite State Designers and Installers Association
603/228-1231
New Mexico
Professional Onsite Wastewater Reuse Association of New Mexico
505/989-7676
North Carolina
North Carolina Septic Tank Association
336/416-3564
North Carolina Portable Toilet Group
252/249-1097
North Carolina Pumper Group
252/249-1097
Ohio
Ohio Onsite Wastewater Association
866/843-4429
Oregon
Oregon Onsite Wastewater Association
541/389-6692
Pennsylvania
Pennsylvania Association of Sewage Enforcement Officers
717/761-8648
Pennsylvania Onsite Wastewater Recycling Association
Pennsylvania Septage Management Association
717/763-7762
Tennessee
Tennessee Onsite Wastewater Association
Texas
Texas On-Site Wastewater Association
888/398-7188
Virginia
Virginia Onsite Wastewater Recycling Association
540/377-9830
Washington
Washington On-Site Sewage Association
253/770-6594
Wisconsin
Wisconsin Onsite Water Recycling Association
608/441-1436
Wisconsin Liquid Waste Carriers Association
608/441-1436
NATIONAL
Water Environment Federation
800/666-0206
National Onsite Wastewater Recycling Association
800/966-2942
National Association of Wastewater Technicians
800/236-6298
CANADA
Alberta
Alberta Onsite Wastewater Management Association
877/489-7471
British Columbia
WCOWMA Onsite Wastewater
Management of B.C.
877/489-7471
Manitoba
Manitoba Onsite Wastewater Management Association
877/489-7471
New Brunswick
New Brunswick Association of Onsite Wastewater Professionals
506/455-5477
Nova Scotia
Waste Water Nova Scotia
902/246-2131
Ontario
Ontario Onsite Wastewater Association
855/905-6692
Ontario Association of Sewage Industry Services
877/202-0082
Saskatchewan
Saskatchewan Onsite Wastewater Management Association
877/489-7471
Canadian Regional
Western Canada Onsite Wastewater Management Association
877/489-7471O
