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When a state or authorized tribe submits a water quality standard for EPA's review, Clean Water Act (CWA) section 303(c)(3) requires EPA to approve the submittal within 60 days or disapprove within 90 days of the date of submission. An EPA disapproval must specify the changes necessary to assure the state or tribal standard will comply with the Act. If the state or tribe does not adopt the specified changes within 90 days of receiving the EPA's disapproval, CWA section 303(c)(4) requires EPA to "promptly prepare and publish" a Federal water quality standard that complies with the Act. EPA's promulgation of state- or tribe-specific water quality standards to comply with statutory requirements is expected to occur periodically and on an ongoing basis.