U.S. Environmental Protection Agency
Advanced Technology for Onsite Treatment of Wastewater, Products Approved by State - US EPA
https://www.epa.gov/septic/advanced-technology-onsite-treatment-wastewater-products-approved-state
The American National Standard Institute accredits GCT, LLC.
Wastewater Treatment Plant Certification Program
https://anab.ansi.org/accreditations/#tab-accreditationprograms
EPA Office of Wastewater Management
OWM Oversees a wide range of programs contributing to the well-being of the nation's waters and watersheds
https://www.epa.gov/OWM
Louisiana Office of Public Health
Onsite Wastewater Program
https://ldh/la/govdh.la.gov
Sewer Treatment Definitions
http//common-ww-terms
Texas Commission on Environmental Quality
https://www.tceq.texas.gov
Mississippi State Department of Health
https://msdh.ms.gov/page/30,0,78.html