6 county-level rules, plus city-specific rules for 9 cities in Contra Costa County, California.
Verified from official government sources
Unincorporated Contra Costa County enforces quiet hours of 10 p.m.–7 a.m. on weeknights and 10 p.m.–8 a.m. on weekends, using a plainly-audible standard — noise heard inside a neighbor's closed dwelling. The Sheriff responds first, with Code Enforcement handling chronic problems.
Contra Costa County Department of Conservation & Development — Memo to Municipal Advisory Councils regarding Noise Related Issues and Options (June 14, 2024)
In response to noise concerns raised by members of the public, the Contra Costa County Board of Supervisors has directed the Department of Conservation and Development to initiate the process of collecting and evaluating public input regarding noise in the County including but not limited to large events, loud parties and construction. The County has some existing regulations to address noise, ...
Construction in unincorporated Contra Costa County is limited to 7 a.m.–7 p.m. weekdays and 8 a.m.–5 p.m. Saturdays, with no construction on Sundays or holidays. Emergency utility and safety repairs are exempt; violations can bring stop-work orders and fines.
Contra Costa County DCD FAQ (Construction Hours) and County Ordinance Code § 716-8.1008 (Grading — Nuisances); CCC DCD Memo on Noise Related Issues (June 14, 2024)
Contra Costa County Department of Conservation & Development FAQ — "What are the construction working hours in a residential neighborhood?" Answer: "In general, there are no restrictions for construction working hours within Contra Costa County. Occasionally, as a conditional of approval, the Planning Division may restrict days and times of construction to a permit approval. The Planning Divisi...
Contra Costa County's Noisy Animal Ordinance (County Code §416-12.202) makes it a violation for an animal to create noise 30 continuous minutes or 60 intermittent minutes within 24 hours. Complaints go to Animal Services and require a notarized affidavit filed within 60 days.
Contra Costa County Ordinance Code § 416-12.202 (Animal noise) — Noisy Animal Ordinance
Under the Contra Costa County Noisy Animal Ordinance (Ordinance Code section 416-12.202), it is unlawful to have an animal that makes noise for an extended period of time and the noise disturbs any person at any time of day or night. A "noisy animal" means an animal that makes any noise for an extended period of time to the disturbance of any person at any time of day or night, regardless of wh...
Gas and electric lawn equipment in unincorporated Contra Costa County may generally be operated between 7:00 AM and 7:00 PM on weekdays and 8:00 AM to 5:00 PM on weekends. Outside those hours, operation is a noise-ordinance violation under Title 716.
Cal. Legislature Bill 202120220AB1346
(2) In 2020, California daily NOx and ROG emissions from SORE were higher than emissions from light-duty passenger cars. SORE emitted an average of 16.8 tons per day of NOx and 125 tons per day of ROG. Without further regulatory action, those emission levels are expected to increase with increasing numbers of SORE in California. Regulations of emissions from SORE have not been as stringent as r...
Unincorporated Contra Costa County restricts amplified music that is plainly audible inside a neighbor's closed home, prohibits nighttime amplification from 10 p.m. to 7 a.m., and requires permits for temporary outdoor events with amplified sound.
Contra Costa County Ordinance Code § 716-8.1008 (Grading — Nuisances); Temporary Events Ordinance (Ord. 2022-23); CA Vehicle Code § 27007
Contra Costa County does not have a comprehensive, county-wide noise ordinance regulating amplified music in residential areas. The Contra Costa County Ordinance Code does not have a specific noise ordinance, but it addresses impacts that are due to construction noise under the Grading Ordinance Section 716-8.1008, stating that operations shall be controlled to prevent nuisances to public and p...
Vehicle noise in unincorporated Contra Costa County is enforced under the California Vehicle Code: mufflers are required (CVC §27150), modified exhausts can't exceed factory noise levels (§27151), car stereos audible 50 feet away violate §27007, and sideshows fall under §23109. The Sheriff and CHP enforce.
California Vehicle Code §§ 27150, 27151, 27007 (state preemption — enforced locally by Contra Costa County Sheriff)
California Vehicle Code § 27150(a): "Every motor vehicle equipped with an internal combustion engine and subject to registration shall at all times be equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise, and no muffler or exhaust system shall be equipped with a cutout, bypass, or similar device." California Vehicle Code § 271...
9 cities in Contra Costa County have their own noise ordinances rules. Each link goes to that city's dedicated page with code citations.
5 verified rules • Amplified Music & Events, Construction Hours
5 verified rules • Amplified Music & Events, Construction Hours
7 verified rules • Aircraft Noise, Amplified Music & Events
7 verified rules • Aircraft Noise, Amplified Music & Events
5 verified rules • Amplified Music & Events, Construction Hours
5 verified rules • Amplified Music & Events, Construction Hours
6 verified rules • Amplified Music & Events, Barking Dogs
7 verified rules • Aircraft Noise, Amplified Music & Events
7 verified rules • Aircraft Noise, Amplified Music & Events
See every category we cover for Contra Costa County — parking, noise, fences, fires, animals, pools, and more.
Contra Costa County Ordinance Hub →