Naperville sets decibel limits by zoning district under Title 6, Chapter 14. Noise is measured at the property line with ANSI S1.4-1983 compliant meters. Limits range from residential thresholds up to 80 dBA for industrial zones.
Naperville Municipal Code Section 6-14-4 establishes noise limits by zoning district using Table 1. Sound pressure levels are measured at the property line with a sound level meter and octave band analyzer conforming to ANSI S1.4-1983 specifications. Residential zones have the lowest thresholds, commercial zones have intermediate limits, light industrial zones are capped at 70 dBA, and industrial zones at 80 dBA. Quiet hours from 7 PM to 7 AM impose stricter limits across all zones. Permitted amplifiers under Title 3 Chapter 9 are exempt from Table 1 limits. Emergency vehicles and emergency operations are also exempt.
Exceeding decibel limits is a zoning performance standard violation. Fines apply per the general ordinance penalty schedule with escalation for repeat offenses.
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