Industrial property in unincorporated St. Lucie County may not exceed 70 dBA at all times at the receiving property line (Sec. 28-110). Low-frequency octave bands against residential property are capped at 65 dB. Port St. Lucie's Chapter 94 industrial limits run 75/70/65 (L1/L10/L50).
Under Sec. 28-110, industrial-category property carries a 70 dBA limit at all times, higher than the 65 dBA commercial and 60/55 dBA residential limits, but sound projected into a lower-limit receiving category may not exceed that receiving category's limit. Sec. 28-110(4) adds that 'for any sound source which impacts residential property, the maximum allowable sound level limits for the individual octave bands whose centers are 31.5, 63 and 125 Hertz shall not exceed 65 dB,' targeting low-frequency hum. Certain pre-existing utility and industrial operations are exempt under Sec. 28-111(7) and (11). Port St. Lucie's Table I sets industrial limits of 75 (L1) / 70 (L10) / 65 (L50) dBA and an 85 dBA peak.
Industrial noise exceeding the limits at a receiving property line is enforced under Code § 1-7 (county) or Sec. 94.09 (Port St. Lucie), measured with an ANSI-conforming meter. Pre-existing exempt utilities remain outside the dB caps.
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