Boulder County's noise ordinance exempts "property used for manufacturing, industrial, or commercial business purposes" from its dB limits. Colorado's CRS 25-12-103 still caps industrial noise at 80 dB(A) day / 75 night and light industrial at 70/65.
Ordinance No. 92-28, Section 1.01.060(D) exempts "Property used for manufacturing, industrial, or commercial business purposes" from the county's dB-limit and measurement provisions, so the 55/50 residential caps don't govern activity at those sites. The controlling standard for industrial and commercial zones is the state statute, CRS 25-12-103: Commercial 60 (day)/55 (night), Light industrial 70/65, and Industrial 80/75 dB(A), measured 25 feet from the property line, with excess being prima facie evidence of a public nuisance. Public utilities (Title 40) and oil-and-gas operations (Title 34, Art. 60) are separately exempt under Sec 1.01.060(E)-(F).
Industrial noise exceeding CRS 25-12-103 is prima facie evidence of a public nuisance; utilities and oil-and-gas noise fall under their own state regulatory regimes.
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