Every person possessing a place that is infested with rodents, as soon as their presence comes to his or her knowledge, shall at once proceed and continue in good faith to endeavor to exterminate and destroy the rodents, by poisoning, trapping, and other appropriate means, and to
abate the conditions listed in Section 17920.3 that are causing the infestation.
Source:
Section 116125, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=116125..