Norwalk sets no fixed decibel cap for industry. Municipal Code Section 9.04.120 presumes ambient levels of 55 dBA daytime and 45 dBA night in residential zones, 60 dBA commercial, 65 dBA elsewhere. Exceeding ambient by more than 5 decibels at a residential property line is a violation.
Norwalk's noise ordinance is Title 9, Chapter 9.04, Article III. Section 9.04.120 presumes ambient noise at 45 dBA night and 55 dBA day in residential zones, 60 dBA anytime in commercial zones, and 65 dBA anytime in all other zones, including M-1 and M-2. Day runs 7:00 a.m. to 10:00 p.m. and night runs 10:00 p.m. to 7:00 a.m. Section 9.04.140(B) makes a reading that exceeds the ambient level at a residential property line by more than five decibels prima facie evidence of a violation. Section 9.04.130 requires three readings at two-minute intervals, averaged, taken at the property line.
Noise exceeding the ambient level by more than five decibels at a residential property line is prima facie evidence of a Chapter 9.04 violation, enforced by the City through citations and abatement.
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