Stanislaus County, CA Noise Ordinances: Aircraft Noise (2026)

Stanislaus County Code § 10.46.080 lists eleven categories of sources exempt from the county's noise control chapter, and subsection F exempts "locomotives and other railroad equipment, and aircraft" without qualification. Because aircraft is not defined narrower elsewhere in the chapter's definitions section (§ 10.46.030), the exemption reaches all classes of aircraft operating in or over the unincorporated county, including helicopters, whether on approach, departing, or engaged in low-altitude operations such as agricultural spraying or medical transport. This means the specific noise source standards in § 10.46.060, which regulate motor vehicle sound systems, power tools, audio equipment, sound-amplifying equipment, construction equipment, and alarms, and the general exterior noise level standards in § 10.46.050 (the Table A decibel limits by noise zone and time of day) simply do not reach helicopter operations.

The chapter's other exemptions sit alongside this one for context: parades and special events with a county permit (§ 10.46.080(C)), publicly owned property activities (§ 10.46.080(D)), religious worship sounds (§ 10.46.080(E)), and activities preempted by state or federal law (§ 10.46.080(I)) are all similarly carved out. The aircraft exemption reflects that aviation noise is federally occupied territory, the FAA regulates aircraft noise certification and flight operations nationally, so a county noise ordinance provision purporting to cap helicopter decibel levels would run into federal preemption. Residents near a heliport, agricultural airstrip, or hospital helipad in unincorporated Stanislaus County therefore have no recourse under Chapter 10.46 for helicopter noise complaints; any such rules would need to come from FAA flight paths, airport land use compatibility plans, or a specific conditional use permit's own conditions rather than this ordinance.