Industrial and commercial noise in San Mateo is regulated by the noise ordinance Chapter 7.30, which sets maximum permissible sound levels by noise zone. Noise Zone 3 (commercial) allows 60 dB at night and 65 dB during the day. Zone 4 (industrial) allows 70 dB at all times.
The City of San Mateo regulates commercial and industrial noise through Chapter 7.30 of the municipal code. Section 7.30.040 establishes maximum permissible sound levels by noise zone. Noise Zone 3 (commercial/office areas) allows 60 dB at night (10 PM-7 AM) and 65 dB during the day (7 AM-10 PM). Noise Zone 4 (industrial/manufacturing areas) allows 70 dB at all times. Sound levels are measured at the property line. Additional thresholds apply for shorter durations: +5 dB for 15 minutes, +10 dB for 5 minutes, +15 dB for 1 minute, +20 dB for any period. Industrial operations along the rail corridor and Bay-area industrial zones must comply with these limits. Noise from HVAC, generators, and loading operations are common enforcement issues.
Exceeding property-line noise limits violates Chapter 7.30. The city may require noise mitigation. Persistent violations may result in escalating fines.
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See how San Mateo's industrial noise rules stack up against other locations.
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