Murfreesboro's Table 2 caps exterior sound at 55 dBA daytime / 48 dBA nighttime in residential zones, 65 / 58 dBA commercial, and 70 dBA around the clock in industrial zones, measured at the receiving property line. Rutherford County sets no county-wide dB cap.
Under Murfreesboro City Code sec. 21-106(B), Table 2, the maximum permissible exterior sound level measured at the receiving property boundary is 55 dBA (7 AM-10 PM) and 48 dBA (10 PM-7 AM) for residential or noise-sensitive zones; 65 / 58 dBA for commercial zones; and 70 dBA at all hours for industrial zones. Slightly lower limits apply to pure tones and cyclically varying sounds. A violation generally requires the source to raise the level at least 3 dBA over background. Unoccupied receiving lots yield only a technical violation. Rutherford County's unincorporated area has no adopted decibel table and relies on nuisance law.
Prima facie violation whenever the applicable dB limit is exceeded. Enforced by a qualified Noise Control Officer using a Type 1 or 2 sound meter; cited under City Code sec. 1-8.
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