Okla. Admin. Code § 252:623-5-1
Users must provide and operate all wastewater treatment equipment necessary to maintain compliance with categorical pretreatment standards, local limits, prohibitions set out in OAC 252:623-1-7(a), and the requirements in any permit issued pursuant to Subchapter 9 of the Chapter within the time limitations specified by EPA, the State, or the DEQ, whichever is more stringent. Detailed plans describing a user's wastewater treatment facilities and operating procedures shall be submitted to the DEQ for review, and shall be acceptable to the DEQ before such facilities are constructed. The review of such plans and operating procedures shall not relieve the user from the responsibility of modifying such facilities as necessary to produce a discharge acceptable to the DEQ under the provisions of this Chapter.
Okla. Admin. Code § 252:623-5-1