Clark County, NV Noise from Specific Sources: Generator Noise (2026)

Backup and portable generators in unincorporated Clark County are treated as stationary noise sources under Title 30 Section 30.68.020. Routine operation must comply with the octave-band caps — 47 dB day and 37 dB night at 1000 Hz for residential zones at the receiving property line. Most portable gasoline generators emit 70 to 85 dB at 23 feet, so they cannot comply without significant setback, an acoustic enclosure, or a sound-attenuated permanent standby unit. Permanent standby generators for homes in Summerlin South, Enterprise, and luxury estates typically require a mechanical permit and must be located to meet setback plus noise limits. Emergency operation during a confirmed power outage is generally exempt under the public welfare rationale of Section 30.68.020, but weekly or monthly self-test runs should occur during daytime hours to avoid violations. Commercial generators at data centers, hospitals, and cell towers are subject to the industrial caps at industrial lot lines but to residential caps where they abut homes. Clark County Air Quality permitting under Regulation 14 also applies to large stationary engines.