Costa Mesa's Noise Ordinances: The Rules That Matter

Every city handles noise ordinances a little differently. In Costa Mesa, California, there are 4 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Amplified Music & Outdoor Sound

Costa Mesa limits amplified sound equipment mounted on advertising sound trucks under Section 9-140: the truck must be moving at least 10 mph while the amplifier runs, sound is banned within 100 yards of hospitals, schools, churches and city hall, and no permit can authorize operation between 1:00 p.m. and 3:00 p.m. or run longer than 30 days.

Key details: Minimum truck speed while amplifying: 10 mph, § 9-140(a). Buffer from hospitals/schools/churches: 100 yards, § 9-140(b). Permitted sound: Music or speech only, § 9-140(c). Blackout hours: 1:00-3:00 p.m. daily, § 9-140(d). Max permit length: 30 days, § 9-140(e).

Article 4 does not set its own fine, so violating the sound truck rules is enforced through Costa Mesa's citywide penalty scheme in Section 1-33: an infraction with fines up to $100 for a first offense, $200 for a second within a year, and $500 for later offenses, or prosecution as a misdemeanor carrying a fine up to $1,000 and up to six months in jail. Operating amplifying equipment outside the designated streets or the 1:00-3:00 p.m. blackout, or beyond the permit's 30-day term, are each separately chargeable.

Compared to other cities, Costa Mesa takes a harder line on amplified music & outdoor sound. The enforcement and penalty structure reflects that.

Leaf Blower Rules

Costa Mesa restricts leaf blowers in residential areas to 7 a.m. to 5 p.m. weekdays, 9 a.m. to 5 p.m. Saturdays, and noon to 5 p.m. Sundays and holidays. Section 20-10 caps blower noise at 65 decibels, bars operation within 10 feet of an open window, and requires each blower to carry the operator's business name and phone number.

Key details: Weekday hours: 7:00 a.m. to 5:00 p.m.. Saturday hours: 9:00 a.m. to 5:00 p.m.. Sunday/holiday hours: Noon to 5:00 p.m.. Noise cap: 65 dB; 55 dB max for 15 min. Measured at: 50 feet from the blower.

Section 20-12(j) separately declares that operating a leaf blower inconsistent with Section 20-10 is itself a public nuisance, so a violation can trigger the full Title 20 abatement track: a director's notice to abate under Section 20-15, service by posting and certified mail under Section 20-16, and civil fines of up to $1,000 per day under Section 20-13(a) if noncompliance continues, with a 10-day right to appeal to the city council under Section 20-17.

Barking Dogs

Costa Mesa treats a barking dog as a public nuisance once it barks continuously for 30 minutes or intermittently for 60 minutes in any 24-hour period. Municipal Code Section 3-113 lets the Police Department issue an administrative citation after a 10-day written warning, and every day the noise continues past that deadline counts as a separate offense.

Key details: Barking threshold: 30 min continuous or 60 min intermittent/24 hrs. Warning period: 10 days to abate after notice. Enforcing agency: Costa Mesa Police Department. Continuing violation: Each day past notice is a new offense. Appeal window: Via Code Sections 1-42 to 1-47.

A first barking-dog complaint triggers a written warning notice, not an immediate fine; the owner gets 10 days from mailing or service to stop the noise. Ignoring the notice brings an administrative citation from the Police Department, with each additional day of barking treated as a new offense under Section 3-113. Citations can be appealed under Sections 1-42 through 1-47, and the city may still pursue criminal or civil nuisance remedies in parallel.

Construction Hours

Costa Mesa limits construction work to 7:00 a.m. to 7:00 p.m. Monday through Friday and 9:00 a.m. to 6:00 p.m. on Saturdays. Construction is barred entirely on Sundays and six named federal holidays under Municipal Code § 13-279.

Key details: Weekday hours: 7:00 a.m. to 7:00 p.m., Mon-Fri. Saturday hours: 9:00 a.m. to 6:00 p.m.. Sunday/holidays: Prohibited all hours. Waiver authority: Development services director. Max misdemeanor fine: $1,000 and/or 6 months jail.

Construction outside the approved hours, or without the required city permits, is not exempted from the Noise Control chapter and can be prosecuted under § 13-286: a misdemeanor punishable by a fine of up to $1,000 and/or up to six months in county jail, or the city may instead charge the offense as an infraction. Each violation is a separate offense; the city council has also declared prohibited noise a public nuisance subject to abatement under Chapter I, Article 4, Enforcement.

The Bottom Line

Costa Mesa's noise ordinances rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Costa Mesa is broadly strict or permissive.

Keep in mind that Costa Mesa can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.