In Fort Collins Industrial (I) zones the limit is 80 dB(A) (7 a.m.–8 p.m.) and 75 dB(A) (8 p.m.–7 a.m.), measured at the receiving line. Colorado C.R.S. § 25-12-103 and Larimer County use the same 80/75 industrial and 70/65 light-industrial tiers.
Fort Collins Municipal Code § 20-23 caps Industrial (I) zone noise at 80 dB(A) daytime and 75 dB(A) at night, with Employment (E) zones at 70/65 dB(A); a pure tone lowers the cap by 5 dB(A). Where an industrial source's noise reaches a more restrictive district (e.g., adjacent residential), the most restrictive limit applies. Colorado Revised Statutes § 25-12-103 sets identical statewide industrial (80/75) and light-industrial (70/65) tiers for unincorporated areas, allowing a 10 db(A) rise for up to 15 minutes per hour during the day. Larimer County Ordinance 97-03 follows these limits.
Fort Collins: summons and penalty (§ 20-29 / § 1-15). County: $30/$60/$300 escalating fines; stationary sources may seek a § 20-27 variance.
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