Okla. Admin. Code § 310:210-7-15
A kiosk style barber shop shall be approved to operate within an enclosed building such as a mall or airport lounge. The shop shall be exempted from the requirement of toilet facilities only if toilet facilities, which are available for use, are located within 500 feet. A hand washing lavatory with hot and cold water under pressure through a mixing faucet shall be located within the shop. If a public water supply is not available to the shop a minimum supply of five gallons shall be provided in a sanitary manner with an automatic pressure activated mechanical pump. Additionally a water heater shall be furnished capable of supplying water with a minimum temperature of 110 degrees Fahrenheit. If a common drain for wastewater disposal is not available at the shop a wastewater holding tank with a minimum capacity of five gallons shall be provided. The shop shall not be located within fifty feet of a food preparation or food service area.
Okla. Admin. Code § 310:210-7-15