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

Section 10.16.070(B)(6) of the Mono County Code makes it unlawful to operate, or permit operation of, any tools or equipment used in construction, drilling, repair, alteration, earthmoving, excavating or demolition between 7:00 p.m. and 7:00 a.m. on weekdays, or at any time on weekends or legal holidays. Exceptions are emergency work by public service utilities or road crews, or work authorized by a county variance. Beyond the time window, Section 10.16.060(C) sets construction noise limits where technically and economically feasible. Table 10.16.060(B), for non-scheduled, intermittent, short-term mobile equipment (under ten days), allows 75 dBA at single-family residential, 80 dBA at multi-family, and 85 dBA at commercial land uses during Monday-Saturday 7:00 a.m.-6:59 p.m., dropping to 60/65/70 dBA at night and all day Sundays and holidays. Table 10.16.060(C), for repetitively scheduled, long-term stationary equipment (ten days or more), allows 60/65/70 dBA in those daytime hours and 50/55/60 dBA at night and on Sundays and holidays. All internal-combustion equipment must have working exhaust and intake silencers. These rules apply across the unincorporated Eastern Sierra, not in the Town of Mammoth Lakes.