020-21 Wyo. Code R. § 21-5
(a) Compliance with the standards in these regulations shall be achieved as expeditiously as practicable, but in no case later than one year after final adoption. When compliance with the standards requires construction of new or modified treatment facilities, compliance with the standards shall be achieved as expeditiously as practicable, but in no case later than two years after final adoption.
(b) Water reuse facilities operating under authority granted by the Department of Environmental Quality are required to notify the department of the nature and requirements of the existing authorization. Existing authorized facilities are not required to comply with the requirements of these regulations unless the administrator determines it is necessary to revise the existing authorization in order to protect public health and the environment. Existing facilities are required to comply with the monitoring and reporting requirements of Sections 13, 14, 15 and 16.
020-21 Wyo. Code R. § 21-5