Sandy, UT Noise Ordinances: Decibel Limits (2026)

Section 13-2-5 sets Sandy's numeric noise ceiling using the L90 metric, the sound pressure level exceeded 90 percent of the time in a measurement period of at least ten minutes, measured at the property boundary or any point within the affected property. m. Commercial-agricultural districts allow 55 dB(A) overnight and 60 dB(A) during the day, while industrial districts allow 75 dB(A) overnight and 80 dB(A) during the day. When a noise source can be measured in more than one land-use category, the code applies the more restrictive limit at the boundary between the districts, so an industrial source next to a home is held to the residential number at that line.

The chapter's 'Correction for Duration of Sound' provision adds a stricter test: even within the baseline limits, a source violates the chapter if its tenth-percentile level (L10) runs more than 15 dB(A) above the ambient L90 reading in the same period. The 'Correction for Character of Sound' provision reduces every limit by 5 dB(A) for a source that emits a pure tone, cyclically varying sound, or repetitive impulsive sound, and separately makes it a violation for such a source to create a 'noise disturbance' even if it technically meets the numeric limit.

Measurements are taken with an A-weighted sound level meter under American National Standards Institute methods, per Section 13-2-6, with the Salt Lake City-County Health Department authorized to adopt supplemental testing standards.