Philadelphia County Decibel Limits Rules (2026) — What You Need to Know

Philadelphia's noise code takes an unusual approach compared to most major cities: rather than setting fixed decibel ceilings for different zones, it measures noise relative to the existing background sound level. This "background-plus" model means enforcement adapts to the ambient conditions — a quiet residential block at 2 AM has a much lower background level than a commercial corridor at noon, so the effective limit is correspondingly tighter at night.

For sound originating from residential properties, § 10-403(2) prohibits noise that exceeds 3 dB above the background level at or beyond the property boundary, or that is audible at a distance greater than 100 feet. This is an exceptionally tight standard — 3 dB is barely perceptible to the human ear, meaning any clearly noticeable increase above ambient conditions can trigger a violation.

Non-residential sources get slightly more room under § 10-403(3): 5 dB above background at the nearest occupied residential property boundary and 10 dB at the nearest non-residential boundary. Protected facilities — hospitals, nursing homes, houses of worship, courthouses, schools, libraries, and day care centers — receive extra protection under § 10-403(1), where the 3 dB above background standard applies regardless of the noise source.

Stadiums and concert venues have a distinct cap under § 10-403(5): the total sound level at the nearest residential property boundary cannot exceed 70 dB, exclusive of extraneous sounds. Motor vehicles are addressed separately under § 10-403(8.1), which prohibits sound at 5 dB above background measured from 25 or more feet away. Excessive vibration is also regulated, with a limit of 0.15 inches per second beyond any property boundary.