Water Environment Federation.  
"3: Upgrading from Decentralized Facilities."
 In Planning, Design, and Implementation for New and Upgraded Water Resource Recovery Facilities, 2nd edition MOP 28. 
Water Environment Federation, 2021.
 Accessed November 4, 2025.
 Access Water, https://www.accesswater.org/?id=-10063540CITANCHOR.
 
 
 Water Environment Federation.  
"3: Upgrading from Decentralized Facilities."
 In Planning, Design, and Implementation for New and Upgraded Water Resource Recovery Facilities, 2nd edition MOP 28. 
Water Environment Federation, 2021.
 Accessed November 4, 2025.
 https://www.accesswater.org/?id=-10063540CITANCHOR.
 
 
  Water Environment Federation
  Planning, Design, and Implementation for New and Upgraded Water Resource Recovery Facilities, 2nd edition MOP 28
  Access Water
  Water Environment Federation
  July 9, 2021
  November 4, 2025
  https://www.accesswater.org/?id=-10063540CITANCHOR