The Utilities Superintendent or other duly authorized employees of the city, bearing proper credentials and identification, are authorized, with the permission of the licensee, owner, resident or other person in control of property within the city, to enter all properties for the purpose of inspection, observations, measurement, sampling and testing pertinent to the discharges to the city's sewer system in accordance with the provisions of this chapter. If the licensee, owner, resident or other person in control of property within the city does not permit the entrance to the property, the city shall obtain an administrative search warrant as provided for in § 10.20 before entering the property, except in emergency situations.