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EPA/OW RIN: 2040-AF81 Publication ID: Spring 2018 
Title: ●Updates to Wet Weather Treatment Regulations for POTWs 

Wet weather events (e.g., rain, snowmelt) can impact publicly owned treatment works (POTWs) operations when excess water enters the wastewater collection system. The increased wet weather flows in the collection system can exceed the POTW treatment plant’s capacity to provide the same type of treatment for all of the incoming wastewater. The treatment plant’s secondary treatment units are the most likely to be adversely affected by wet weather because the biological systems can be damaged when too much water flows through them. POTWs employ a variety of operational practices to ensure the integrity of their secondary treatment units during wet weather, and this update to the regulations will clarify permitting procedures for POTW treatment plant options under wet weather operational conditions. These updates will ensure a consistent national approach for permitting POTWs that provides for efficient treatment plant operation while protecting the public from potential adverse health effects of inadequately treated sewage.

Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Long-Term Actions 
Major: No  Unfunded Mandates: No 
EO 13771 Designation: Deregulatory 
CFR Citation: 40 CFR 122   
Legal Authority: 33 U.S.C. 1311    33 U.S.C. 1314   
Legal Deadline:  None
Action Date FR Cite
NPRM  07/00/2019 
Final Rule  07/00/2020 
Regulatory Flexibility Analysis Required: Undetermined  Government Levels Affected: Local, State, Tribal 
Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Christopher Kloss
Environmental Protection Agency
Office of Water
4203M, 1200 Pennsylvania Avenue NW.,
Washington, DC 20460
Phone:202 564-1438

Jenelle Hill
Environmental Protection Agency
Office of Water
Washington, DC 20460
Phone:202 566-1893