Mendocino County, CA Public Conduct: Loud Party Ordinance (2026)

85, adopted in 1997 in response to Sheriff's Office findings that deputies were making repeat calls to disperse the same unsupervised underage parties, targets the host rather than just the minors drinking. Sec. 030 makes it unlawful to suffer, permit, allow or host a party, gathering or event on private property under one's control where five or more people under 21 are present and alcoholic beverages are possessed or consumed by anyone under 21, subject to the state constitutional exception for parents lawfully providing alcohol to their own children in a private residence under Article I, Section 4.

A violation is a misdemeanor carrying up to a $1,000 fine, up to six months in county jail, or both. Sec. 020 defines 'person responsible for the event' broadly to include the property owner, renter, lessee or anyone in charge of the premises who is present or has actual knowledge the event is happening, or the person who organized it; if that person is a juvenile, the juvenile's parents or guardians are jointly and severally liable alongside the juvenile. Once a deputy responding to the scene determines the gathering threatens public peace, health, safety or welfare, Sec.

040 lets the officer arrest or cite the responsible person and hold them liable for the County's cost of law enforcement services, computed under the Sheriff's overtime-based formula in Sec. 025. Sec. 050 caps the debt collection at a Sheriff's waiver of amounts over $500 if paid within 30 days, and channels the first $500 collected per incident into a dedicated Youth Services Fund administered by the Sheriff's Office. A responsible person can appeal the cost assessment within 10 days to a three-member Appeals Committee drawn from the Auditor-Controller's office, Public Health and the Sheriff's Department under Sec.

060, which may reduce or excuse costs based on factors like the accuracy of the billing, the gravity of the violation, and whether it was willful or repeated.