Okla. Admin. Code § 252:621-3-1
Permits issued by the DEQ are required for the construction, operation, installation, or modification of any non-industrial wastewater system covered by this Chapter and written approvals are required for the operation and closure of any non-industrial wastewater system covered by this Chapter and are processed according to the Uniform Permitting Act, Title 27A O.S. § 2-14-101, and the rules promulgated thereunder. This Chapter contains the standards to be met. All changes in the treatment system, methods, wastes, activities or other changes shall be considered a major modification of a facility. Applications for modifications are subject to the requirements found in the Uniform Permitting Act and rules promulgated thereunder.
Okla. Admin. Code § 252:621-3-1