All users of the sewer system shall keep their pipe connections and other apparatus in good repair and protected from freezing at their own expense, but no person, except under the direction of the public works director, shall be allowed to dig into the street, alley, sidewalk or easement beneath which the lateral and trunk line sewers run, or to tap into any such lateral or trunk line in any manner. (Ord. 383, 2-4-1988)