Pomona, CA Public Conduct: Loud Party Ordinance (2026)

Division 4 of Chapter 34 defines a "loud or unruly gathering" in Sec. 34-187 as any party of two or more persons on private property involving conduct such as excessive noise under Sec. 18-301, excessive traffic, crowds spilling into public streets, serving alcohol to anyone underage, assaults or domestic violence, vandalism or litter; such a gathering is declared a public nuisance. A "responsible person" reaches beyond the host: it includes the property owner, tenant, landlord, or anyone who organizes, supervises or controls the gathering, and that person need not even be present to incur liability.

Sec. 34-188 requires every owner, occupant or lessee to manage their property so gatherings do not violate the division, and the owner remains liable regardless of any contract with a third party. Sec. 34-189(a) makes a knowing violation a misdemeanor unless the district attorney, city attorney or city prosecutor charges it as an infraction instead. When charged as an infraction, Sec. 34-189(b) sets a $100 fine for a first violation, $200 for a second violation at the same residence or by the same responsible person within 12 months, and $500 for a third or subsequent violation in that window.

These fines stack with any response costs assessed under Sec. , and the schedule is a "rolling" 12-month look-back that resets only after a full year passes with no further violations at that address, per Sec. 34-189(e).