To the extent that Chapters 16, 77, 87-91, 93, 95, 96, 102 and 105 pertain to a discharge for which an NPDES permit is required, those chapters govern whenever their application produces a more stringent effluent limitation than would be produced by application of Federal requirements. Effluent limitations resulting from the application of those chapters must be expressed in an NPDES permit issued under this chapter.
25 Pa. Code § 92a.11