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

02). 03 makes it unlawful to host or allow such a gathering, and separately bans hosting or allowing a gathering where three or more minors are present with alcohol or an illegal drug in their possession, unless each minor drinking is supervised by a parent or guardian. The PERSON RESPONSIBLE is anyone who owns, rents, leases or controls the premises, the person in charge of the premises, or the organizer; each is jointly and severally liable, and a minor's parent or guardian stands in for them.

04, a violation is a misdemeanor and public nuisance, enforceable by criminal penalty, attorneys' fee recovery, civil penalties, or administrative citation, and an officer can separately cite a responsible person under state alcohol laws (Cal. & Prof. Code §§ 25658, 25662). 05 lets the city recover response recovery costs for every subsequent police response within 12 months, covering staff salary and benefits, administrative costs, medical treatment for injured officers, and damaged city equipment. Unpaid bills accrue a 10% late fee after 30 days and can become a special assessment lien on a property owner's parcel.

A responsible person escapes liability only by taking all reasonable steps to exclude uninvited or unruly guests, including calling police before officers arrive, or by being absent and unnotified at least ten days before a later response, and can appeal any cost imposition under AMC Chapter 1-4.