Mountain View Chapter 21 sets specific decibel thresholds varying by zoning district and time of day, measured at property lines with standardized equipment.
Mountain View Noise Ordinance establishes decibel limits by receiving land use and time of day. Residential zones allow up to 55 dBA daytime (7am to 10pm) and 45 dBA nighttime at the property line. Commercial zones allow 65 dBA daytime and 55 dBA nighttime. Industrial zones adjoining non-industrial uses allow 70 dBA daytime and 60 dBA nighttime. Short-duration peaks and impulsive sounds are evaluated separately using Lmax standards typically 10 to 15 dBA above the average. Measurements are taken with Type 1 or Type 2 sound level meters per ANSI standards. Code Enforcement officers carry calibrated meters for field verification during complaint response.
Contact your local code enforcement office for specific penalty information.
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