Noise Ordinances in Contra Costa County, CA (2026)

Contra Costa County DCD, Memo to Municipal Advisory Councils re Noise Related Issues and Options (June 14, 2024), p. 1 — no county noise ordinance; see Board of Supervisors File 24-0696 (Mar. 5, 2024), Ordinance Code ch. 82-44, and Cal. Penal Code § 415

In response to noise concerns raised by members of the public, the Contra Costa County Board of Supervisors (Board) has directed the Department of Conservation and Development (DCD) 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, per the action taken during the March 5, 2024...

Contra Costa County DCD Code Enforcement FAQ 443, "What are the construction working hours in a residential neighborhood?"; grading hours: Ordinance Code §§ 716-8.1004, 716-8.1008

What are the construction working hours in a residential neighborhood? 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 Division 925-655-2705 retains the information about specific sites.

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...

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...

Contra Costa County Ordinance Code §§ 82-44.406(c), 82-44.410(a)(12), 82-44.410(b)(2) (Temporary Events Ordinance, Ord. 2005-25 as amended by Ord. 2024-07, Mar. 5, 2024)

82-44.406 - Restrictions. (c) All events, whether or not a permit is required under this chapter, are subject to the following noise restrictions: (1) No event may exceed the noise levels specified in Section 82-44.410. (2) Amplified sound by any device is prohibited after 8:00 p.m. Sundays through Thursdays and after 10:00 p.m. Fridays, Saturdays, and holidays. […] 82-44.410(a)(12) Time, place...

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...