For the purposes of this chapter, it shall not be essential that the nuisance is created or contributed to by the owner, occupant, or person having control or management of the premises, but merely that the nuisance is created or contributed to by licensees, invitees, guests, or other persons for whose conduct the owner or operator is responsible, or by persons for whose conduct the owner or operator is not responsible but by the exercise of reasonable care ought to have become aware of.
(2008 Code, § 8.16.050)