Okla. Stat. tit. 59, § 59-1015: Municipal water and sewage systems - Rules and

regulations.

Each city and/or incorporated town with a population of two

thousand (2,000) or more in the state, having a system of water

supply or sewerage shall, and any incorporated town, or any sewer

district Commission may, by ordinance or regulation, prescribe rules

and regulations for the material, construction, installation and

inspection of all plumbing and sewerage placed in, or in connection

with any building, structure, or conveyance in such city, town or

sewer district, and the board of health or other proper authority of

such city, town or sewer district shall further provide that no

plumbing work shall be done, except in the case of repairing leaks,

without permit being issued therefor upon such terms and conditions

as such city, town or sewer commission shall prescribe.