37 Tex. Admin. Code § 259.616
A shower, toilet, and lavatory, which are accessible at all times, shall be provided for each group or increment of 12 inmates. In housing areas other than minimum security or direct supervision, showers, toilets, and lavatories shall be constructed in such manner and of such material so as to resist vandalism. Warm water shall be provided at all lavatories and showers. Warm water temperature shall be between 100 and 120 degrees Fahrenheit. Sanitary facilities should be within the inmate living and day room areas. Sanitary facilities shall be within reasonable proximity to inmate living and day room areas and accessible by walkways which are covered or other means provided which will protect inmates from inclement weather. A separate toilet should be available for staff.
37 Tex. Admin. Code § 259.616