How Brentwood Handles Noise Ordinances: A Practical Guide

Brentwood maintains 142 local ordinances across all categories, and 5 of those deal specifically with noise ordinances. Here is a breakdown of what the city actually requires, what is prohibited, and where Brentwood falls on the strict-to-permissive spectrum compared to other cities.

Decibel Limits

Brentwood sets exterior noise limits of 60 dBA (residential and commercial) or 65 dBA (industrial) by day, dropping to 45 dBA residential/commercial and 60 dBA industrial at night. Interior multifamily limits run 40-45 dBA overnight and morning.

Key details: Zone I/II daytime exterior: 60 dBA (7am-10pm). Zone I/II nighttime exterior: 45 dBA (10pm-7am). Zone III (industrial) day/night: 65 / 60 dBA. Interior multifamily overnight: 40 dBA (10pm-7am). Pure tone/music penalty: Limits reduced 5 dB.

Violating the noise level limits of Chapter 9.32 is a misdemeanor punishable by a fine of not more than five hundred dollars, imprisonment in Contra Costa County Jail for not more than six months, or both, under Section 9.32.090. Each day of continuing violation is a separate offense.

Construction Hours

Brentwood limits noisy construction and grading to weekdays 7 a.m. to 3:30 p.m. (or 5:30 p.m. with city engineer approval), with no weekend work except an approved Saturday window of 8 a.m. to 5 p.m. Sundays and city holidays are off-limits.

Key details: Weekday heavy construction hours: 7:00am-3:30pm (Mon-Fri). Extended hours w/ approval: Until 5:30pm. Saturday (with approval): 8:00am-5:00pm only. Sunday/holidays: No heavy construction. Carpentry tools (residential): 7am-7pm weekdays, 9am-5pm Sat.

A violation of the construction noise hour restrictions in Section 9.32.050 is a misdemeanor under Section 9.32.090, punishable by a fine of not more than five hundred dollars, imprisonment in Contra Costa County Jail for not more than six months, or both, with each day of continued violation a separate offense.

Amplified Music & Outdoor Sound

Brentwood requires a temporary use permit from community development for amplified sound activities that would exceed normal noise limits, reviewed by police, capped at four occasions or six weeks, and appealable if denied.

Key details: Permit issuer: Community Development Dept.. Review agency: Police Department. Max occasions per permit: 4, within 6 weeks. In-home parties: No permit needed, still must meet limits. Appeal path: BMC Chapter 17.880.

Operating amplified sound equipment without a required temporary use permit, or in violation of a permit's conditions, is a misdemeanor under Section 9.32.090, punishable by a fine of not more than five hundred dollars, up to six months in the Contra Costa County Jail, or both; a permit may also be surrendered to police or code enforcement for violating its restrictions.

Barking Dogs

Brentwood enforces barking-dog and noisy-animal complaints through the Contra Costa County Animal Services Department, adopted by reference in Municipal Code Section 6.12.010. A signed, sworn complaint or a department employee's observation can trigger an administrative penalty, and repeat nuisance violations escalate from a $100 to a $500 fine.

Key details: Enforcing agency: Contra Costa County Animal Services Dept.. Complaint requirement: Signed under penalty of perjury. First violation fine: Up to $100 infraction. Repeat violation fine: Up to $200, then $500. Kennel barking rule: Barred beyond premises in R/MHP zones.

A first substantiated animal-noise complaint draws an infraction fine capped at $100, rising to $200 for a second violation of the same ordinance within a year and $500 for each further violation within that year, under Section 6.12.020(E). The county animal services department can also issue a separate administrative penalty under Article 416-4.8 based on a sworn complaint or its own observation. A kennel that lets barking carry beyond its property line in an R or MHP district violates Section 17.670.007(B) independently of any noise complaint against an individual pet owner.

Leaf Blower Rules

Powered lawn and gardening equipment in Brentwood may be operated from 7:00 AM to 7:00 PM on weekdays and Saturdays, and from 8:00 AM to 6:00 PM on Sundays and holidays. Electric and battery-powered equipment must still comply with these hours under BMC Chapter 9.32.

Key details: Weekday/Saturday: 7 AM-7 PM. Sunday/holidays: 8 AM-6 PM. Applies to: All powered equipment (gas & electric). State law: AB 1346 (no new gas SORE sales). First fine: $100.

The Bottom Line

Brentwood'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 Brentwood is broadly strict or permissive.

All of the above reflects Brentwood's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.