Logan, UT Noise Ordinances: Decibel Limits (2026)

Section 8.16.600 of the Logan Municipal Code bars any person from operating on private property a source of sound that exceeds the limits in Table I for the receiving land zone, measured at or within the property boundary of the receiving land zone. The limits are in A-weighted decibels, and the chapter applies A-weighting whenever no weighting is stated.

Table I sets these limits. For R1, R1A, R2, R2A and MH land: 50 dBA from 10:00 P.M. to 7:00 A.M., 55 dBA from 7:00 P.M. to 10:00 P.M., and 60 dBA from 7:00 A.M. to 7:00 P.M. For R3 and R4 land: 55 dBA from 10:00 P.M. to 7:00 A.M. and 60 dBA from 7:00 A.M. to 10:00 P.M. For C1, C2 and C3 land: 60 dBA at night and 65 dBA from 7:00 A.M. to 10:00 P.M., with 55 dBA at night and 60 dBA by day where the origin of the noise is within 100 feet of a hotel, motel or apartment where people normally sleep. For M1 land: 70 dBA at any time.

Section 8.16.610 reduces the Table I limits by ten dBA for any source emitting a pure tone or impulsive sound. Chapter 8.16 defines a pure tone as a sound distinctly heard as a single pitch, and it exists when a one-third octave band exceeds the average of its two neighboring bands by five dB for center frequencies of 500 Hz and above, by eight dB between 160 and 400 Hz, and by fifteen dB at or below 125 Hz. Impulsive sound is short, usually under one second, with an abrupt onset, such as explosions, drop forge impacts and firearm discharge.

Section 8.16.620 exempts construction, explosives and firearms, stationary nonemergency signaling devices, emergency signaling devices, domestic power tools and recreational motorized vehicles operating off public rights of way, which have their own sections. It also exempts the unamplified human voice, interstate railway locomotives and cars, and nonstationary farming equipment.