Castle Rock's code uses an audibility standard, but Colorado's CRS 25-12-103 supplies the dB backstop: residential noise measured 25 feet from the property line is capped at 55 dB(A) (7 a.m.-7 p.m.) and 50 dB(A) (7 p.m.-7 a.m.).
Castle Rock Municipal Code Chapter 9.16 primarily uses a plain-audibility test (not audible 100 feet away). Where a numeric measurement is needed, Colorado Revised Statute 25-12-103 provides the maximum permissible noise levels. Sound radiating from a property line, measured at 25 feet or more, that exceeds the listed dB(A) is prima facie evidence of a public nuisance. Residential zones: 55 dB(A) daytime (7 a.m.-7 p.m.), 50 dB(A) nighttime. Commercial: 60/55; light industrial: 70/65; industrial: 80/75. A 10 dB(A) bump is allowed for up to 15 minutes per hour, and periodic, intermittent or shrill noise triggers 5 dB(A) lower. Measurements require wind under 5 mph.
Exceeding the CRS 25-12-103 thresholds is prima facie public nuisance, enforceable by the Town. Report to Police / Code Compliance at 303-663-6100.
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