Industrial-zone noise may reach 80 dB(A) (7 a.m.-7 p.m.) and 75 dB(A) (7 p.m.-7 a.m.) at a property line under CRS 25-12-103. Light-industrial zones are held to 70/65 dB(A).
Colorado's noise statute, adopted by Jefferson County, sets the highest limits for industrial and manufacturing zones (areas of manufacturing, processing, warehousing, and vehicle servicing). Sound radiating 25 feet or more from the property line above 80 dB(A) by day or 75 dB(A) at night is prima facie a public nuisance. Notably, the county policy exempts property used for manufacturing, industrial, or commercial business purposes from citation under the residential-style rules, leaving state statute and the industrial caps as the governing standard. Railroad rights-of-way are treated as industrial zones.
State law makes excess industrial noise a public nuisance abatable in district court; injunction violations carry $100-$2,000 fines per day (CRS 25-12-105).
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See how Jefferson County's industrial noise rules stack up against other locations.
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