Section 131.5 - EPA authority(a) Under section 303(c) of the Act, EPA is to review and to approve or disapprove State-adopted water quality standards. The review involves a determination of: (1) Whether the State has adopted designated water uses that are consistent with the requirements of the Clean Water Act;(2) Whether the State has adopted criteria that protect the designated water uses based on sound scientific rationale consistent with § 131.11 ;(3) Whether the State has adopted an antidegradation policy that is consistent with § 131.12 , and whether any State adopted antidegradation implementation methods are consistent with § 131.12 ;(4) Whether any State adopted WQS variance is consistent with § 131.14 ;(5) Whether any State adopted provision authorizing the use of schedules of compliance for water quality-based effluent limits in NPDES permits is consistent with § 131.15 ;(6) Whether the State has followed applicable legal procedures for revising or adopting standards;(7) Whether the State standards which do not include the uses specified in section 101(a)(2) of the Act are based upon appropriate technical and scientific data and analyses, and(8) Whether the State submission meets the requirements included in § 131.6 of this part and, for Great Lakes States or Great Lakes Tribes (as defined in 40 CFR 132.2 ) to conform to section 118 of the Act, the requirements of 40 CFR part 132.(9) Where applicable, whether State adopted water quality standards are consistent with § 131.9.(b) If EPA determines that the State's or Tribe's water quality standards are consistent with the factors listed in paragraphs (a)(1) through (9) of this section, EPA approves the standards. EPA must disapprove the State's or Tribe's water quality standards and promulgate Federal standards under section 303(c)(4), and for Great Lakes States or Great Lakes Tribes under section 118(c)(2)(C) of the Act, if State or Tribal adopted standards are not consistent with the factors listed in paragraphs (a)(1) through (9) of this section. EPA may also promulgate a new or revised standard when necessary to meet the requirements of the Act.(c) Section 401 of the Clean Water Act authorizes EPA to issue certifications pursuant to the requirements of section 401 in any case where a State or interstate agency has no authority for issuing such certifications.48 FR 51405, Nov. 8, 1983, as amended at 56 FR 64894, Dec. 12, 1991; 60 FR 15387, Mar. 23, 1995; 80 FR 51047 , Aug. 21, 2015