St. Lucie County Sec. 28-110 sets receiving-property dBA limits: residential 60 (day) / 55 (night), commercial 65 at all times, industrial 70 at all times, measured at the property line. Multifamily units are held to 50 dBA day / 40 dBA night from a neighbor's unit.
Sec. 28-110's table sets 'Sound Level Limits by Receiving Property Category': Residential 60 dBA (7 a.m.–10 p.m.) and 55 dBA (10 p.m.–7 a.m.); Commercial 65 dBA at all times; Industrial 70 dBA at all times, all measured at the receiving property line on the slow setting. Impulsive sound uses the fast setting and adds 10 dBA to daytime limits. Multifamily dwellings are capped at 50 dBA (day) / 40 dBA (night) from a neighbor's unit, and mixed-use buildings at 55 / 45 in the residential portion. Low-frequency octave bands (31.5, 63, 125 Hz) may not exceed 65 dB against residential property. Port St. Lucie's Chapter 94 Table I uses L1/L10/L50 tiers (residential 70/65/60 daytime).
Exceeding these limits is a noise disturbance penalized under Code § 1-7, measured with an ANSI Type 1 or Type 2 sound level meter per Sec. 28-108. Port St. Lucie applies its Sec. 94.09 fine schedule.
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