(A) Upon the promulgation of the national categorical pretreatment standards for a particular industrial user, the said standard, if more stringent than the limitations imposed under this chapter for sources in that category, shall, when effective, immediately supersede the limitations and conditions imposed under this chapter.
(B) State requirements and limitations on discharges apply in any case where they are more stringent than federal requirements or those contained in this chapter.
(Prior Code, § 54.91)