U.S. Environmental Protection Agency
Advanced Technology for Onsite Treatment of Wastewater, Products Approved by State - US EPA

The American National Standard Institute accredits GCT, LLC. 
Wastewater Treatment Plant Certification Program

EPA Office of Wastewater Management
OWM Oversees a wide range of programs contributing to the well-being of the nation's waters and watersheds

EPA's Wastewater Primer
Provides information OWM programs

Louisiana Office of Public Health
Onsite Wastewater Program

Sewer Treatment Definitions

Texas Commission on Environmental Quality

Mississippi State Department of Health,0,78,0,html

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