Costa Mesa Quiet Hours Rules (2026): What You Need to Know
Some RestrictionsKey Facts
- Quiet Hours
- 10 PM to 7 AM daily
- Standard
- Any noise audible beyond residential property line that disturbs a reasonable person during quiet hours
- Common Violations
- Amplified music, loud gatherings, barking dogs, and mechanical equipment
- Daytime Enforcement
- Unreasonable daytime noise may be cited as a public nuisance
- Complaint Line
- Costa Mesa Police non-emergency: (714) 754-5252
- Leaf Blowers
- Motorized landscape equipment prohibited before 7 AM and after 7 PM in residential zones
The Short Version
Costa Mesa Municipal Code (CMMC) Chapter 20-31 establishes quiet hours during which noise that disturbs the peace and comfort of residential neighborhoods is prohibited. Nighttime quiet hours run from 10 PM to 7 AM on all days of the week. During these hours, any noise source that is audible beyond the property line of a residential dwelling and that would disturb a person of normal sensitivity is unlawful. The ordinance broadly covers amplified music, loud parties, barking dogs, mechanical equipment, and any other source of unreasonable noise. Costa Mesa, a mid-size Orange County city with approximately 112,000 residents, sits between Newport Beach, Huntington Beach, and Irvine. Its mix of residential neighborhoods, commercial corridors along Harbor Boulevard and the 17th Street entertainment district, and proximity to South Coast Plaza and the OC Fair & Event Center create diverse noise management challenges. The city enforces quiet-hour protections for all residential zones, including areas adjacent to major commercial activity. During daytime hours (7 AM to 10 PM), noise that is willfully or negligently unreasonable and disturbs the peace and comfort of neighboring residents may still be cited as a public nuisance under general provisions. Residents may report noise complaints to the Costa Mesa Police Department non-emergency line at (714) 754-5252.
Full Breakdown
Costa Mesa Municipal Code (CMMC) Chapter 20-31 establishes quiet hours during which noise that disturbs the peace and comfort of residential neighborhoods is prohibited. Nighttime quiet hours run from 10 PM to 7 AM on all days of the week. During these hours, any noise source that is audible beyond the property line of a residential dwelling and that would disturb a person of normal sensitivity is unlawful. The ordinance broadly covers amplified music, loud parties, barking dogs, mechanical equipment, and any other source of unreasonable noise.
Costa Mesa, a mid-size Orange County city with approximately 112,000 residents, sits between Newport Beach, Huntington Beach, and Irvine. Its mix of residential neighborhoods, commercial corridors along Harbor Boulevard and the 17th Street entertainment district, and proximity to South Coast Plaza and the OC Fair & Event Center create diverse noise management challenges. The city enforces quiet-hour protections for all residential zones, including areas adjacent to major commercial activity.
During daytime hours (7 AM to 10 PM), noise that is willfully or negligently unreasonable and disturbs the peace and comfort of neighboring residents may still be cited as a public nuisance under general provisions. Residents may report noise complaints to the Costa Mesa Police Department non-emergency line at (714) 754-5252.
What Happens If You Violate This?
Quiet-hours violations under CMMC Chapter 20-31 are treated as infractions punishable by fines of $100 for a first offense, $200 for a second offense within one year, and up to $500 for subsequent offenses within a 12-month period. Officers responding to noise complaints may issue a warning on the first visit and a citation on subsequent visits to the same location for the same event. Chronic noise disturbances that constitute a public nuisance may be escalated to misdemeanor prosecution, carrying fines up to $1,000 and/or up to six months in county jail. The city may also pursue civil abatement proceedings against properties with repeated documented violations, requiring property owners to take corrective action to prevent ongoing disturbances.
Frequently Asked Questions
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