Eviction in California when can we start the process

[Armando Gomez]

Have a tenant who has not paid the full rent due to Covid-19.. Military family andHusband died early last year of heart complications. Veteran . Wife is also a Veteran with 3 kids one in College now . She has been renting over 3 yrs now. On rental contract states no pets. And now come to find out has like 4 or more cats on premises .. indoor cats. Found out when her AC went out and had it fixed. The property smelled like cat urine throughout the home. Can I evict them due to unhealthy situation. Also has late water bill and city wants to attach it to my Home thru a lien. ( water bill is aprox. $400)

She gave me a verbal notice that she was moving out June 2020. But supposedly due to Covid she did not. And now forward a 1yr+ and still has not moved out. Any suggestions