CMC Section 10.48.040 sets property-line noise limits by land use: residential origins are capped at 60 dBA daytime and 50 dBA nighttime, and nonresidential origins at 65 dBA daytime and 55 dBA nighttime, measured at the receiving property.
Cupertino Municipal Code Section 10.48.040 ("Daytime and Nighttime Maximum Noise Levels") provides that noise sources on the same property shall not exceed, at the receiving property: for a residential land use at the point of origin, 60 dBA daytime and 50 dBA nighttime; for nonresidential, 65 dBA daytime and 55 dBA nighttime. Measurements use A-weighting (dBA) per ANSI standards under CMC 10.48.010. Section 10.48.050 allows brief daytime incidents to exceed limits so long as the sum of excess dBA plus duration in minutes stays within a defined budget. Interior noise in multiple-family dwellings is separately capped by CMC 10.48.054 at 45 dBA (7 a.m.-10 p.m.) and 40 dBA (10 p.m.-7 a.m.) five feet from a shared wall.
Exceeding the CMC 10.48.040 dBA limits is a violation of Chapter 10.48, a misdemeanor punishable per CMC Chapter 1.12 (CMC 10.48.070), typically enforced via courtesy notice then citation.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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Side-by-side rule comparisons with other cities in Santa Clara County.
See how other cities in Santa Clara County handle decibel limits.
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