Since there is a stay at home order issued in that state it is reasonable to call the police.
Here is a snippet of the actual law
Isolation and quarantine help protect the public by preventing exposure to people who have or may have a contagious disease. Page content includes the regulatory authority and definitions of isolation and quarantine.
www.cdc.gov
State, local, and tribal authorities
Enforce isolation and quarantine within their borders.
It is possible for federal, state, local, and tribal health authorities to have and use all at the same time separate but coexisting legal quarantine power in certain events. In the event of a conflict, federal law is supreme.
Federal isolation and quarantine are authorized for these communicable diseases
Cholera
Diphtheria
Infectious tuberculosis
Plague
Smallpox
Yellow fever
Viral hemorrhagic fevers
Severe acute respiratory syndromes
Flu that can cause a pandemic
Federal isolation and quarantine are authorized by Executive Order of the President. The President can revise this list by Executive Order.
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Since there is no EO the state then can issue their own orders