Mono County, CA Noise Ordinances: Quiet Hours (2026)

Mono County Code Chapter 10.16 (Noise Regulation) governs the unincorporated communities such as June Lake, Crowley Lake, Lee Vining, Bridgeport, Walker, Coleville, Benton and Chalfant. It is enforced by the county Noise Control Office and applies countywide outside the Town of Mammoth Lakes, the only incorporated city. Section 10.16.060(B) prohibits operating any sound source so as to create a level that exceeds the background sound level by at least 10 dBA during daytime hours (7:00 a.m. to 10:00 p.m.) and by at least 5 dBA during nighttime hours (10:00 p.m. to 7:00 a.m.), measured at or within the property line of the receiving property. When background cannot be measured, the absolute limits in Table 10.16.060(A) apply, and pure tones reduce those limits by 5 dBA. Several prohibited acts in Section 10.16.070 carry their own 10:00 p.m.-7:00 a.m. windows, including amplified music, loudspeakers, and deliveries or refuse collection. A first violation may be handled by an abatement order rather than a fine, but each day of a continuing violation is a separate offense. The standards are stricter than many lowland counties because the Eastern Sierra is a quiet, recreation-oriented region.