Industrial noise in Downey must not exceed established ambient levels by more than 5 dBA at the receiving property line. Corrective factors apply during daytime hours (7 AM - 10 PM).
Downey's industrial noise ordinance regulates sound generated by manufacturing facilities, warehouses, commercial HVAC systems, loading operations, and mechanical equipment. Noise from these sources must not exceed 70 dBA during daytime hours (7 AM–10 PM) or 60 dBA during nighttime hours (10 PM–7 AM) as measured at the nearest residential property line. Octave-band analysis may be required for tonal or impulsive noise. New industrial uses must submit noise impact assessments as part of conditional use permit applications. Existing facilities that exceed limits must implement mitigation measures such as sound walls, equipment enclosures, or operational schedule changes. California state environmental regulations supplement local noise control.
Industrial noise violations carry fines of $250–$2,500 per occurrence. Chronic violators face operating permit review and potential conditional use permit revocation. Abatement orders require compliance within 30 days.
Downey, CA
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Side-by-side rule comparisons with other cities in Los Angeles County.
See how other cities in Los Angeles County handle industrial noise.
See how Downey's industrial noise rules stack up against other locations.
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