EPA is promulgating a final amendment to the regulations which implement section 301(h) of the Clean Water Act (CWA'' or ``Act''). Section 301(h) provides for waivers of secondary treatment requirements for discharges into marine waters by publicly owned treatment works (POTWs) that demonstrate their compliance with the 301(h) criteria. This final amendment promulgates without change a previously proposed rule to amend the 301(h) regulations to remove a certain restriction on the eligibility of 301(h) POTWs to request a longer-than-monthly averaging period to calculate compliance with the Act's requirement to remove a minimum of 30 percent of the biochemical oxygen demanding material (BOD) in the influent. EPA determined that this restriction should be eliminated to provide additional flexibility to POTWs in demonstrating compliance with the requirements for a waiver. As a result of this amendment, all 45 applicants for a 301(h) waiver will be able to request a longer than monthly averaging period for calculating compliance with the BOD removal requirement.