LNMC Section 6-6-5 sets residential exterior limits of 55 dB(A) (7 a.m.-10 p.m.) and 50 dB(A) (10 p.m.-7 a.m.). Interior limits (Section 6-6-6) are 55 dB(A) day and 45 dB(A) night. The entire city is Noise Zone 1.
Laguna Niguel uses a measurable dB(A) standard, not a subjective test. Section 6-6-4 designates the whole city as Noise Zone 1. Exterior residential limits (Section 6-6-5) are 55 dB(A) from 7 a.m.-10 p.m. and 50 dB(A) from 10 p.m.-7 a.m. Interior limits (Section 6-6-6) are 55 dB(A) day and 45 dB(A) night inside another dwelling. All limits drop 5 dB(A) for impact, tonal, speech, or music sound. Exceedances are graduated by duration: base limit for over 30 min/hour, +5 dB(A) for 15 min, +10 dB(A) for 5 min, +15 dB(A) for 1 min, +20 dB(A) for any time. Measurements use an ANSI-standard sound level meter (Section 6-6-3) at the affected property (Section 6-6-10).
Measured with a sound level meter per Sections 6-6-3 and 6-6-10; exceeding the Section 6-6-5/6-6-6 limits is a misdemeanor under Section 6-6-15, enforced by police (Section 6-6-11).
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