Quiet hours in Sioux City, IA — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Sioux City Municipal Code Chapter 8.68 (Noise Control) makes any 'noise disturbance' unlawful at all hours (§8.68.020) and adds a 9:00 p.m.-to-7:00 a.m. nighttime window in which a long list of sounds — musical instruments, engine repair, model vehicles, off-road bikes, construction, sound equipment — become a per se disturbance under §8.68.030. Iowa Code §723.4 (disorderly conduct) provides a state-law backstop for loud and raucous noise that disturbs residences.
Section 8.68.020 of the Sioux City Municipal Code (Ord. 2007-0524) bluntly states: 'It is unlawful for any person to willfully make or continue or cause or allow to be made or continued any noise disturbance within the City.' A 'noise disturbance' is defined in §8.68.010 as any sound that annoys or disturbs reasonable persons with normal sensitivities, or that injures or endangers the comfort, repose, health, hearing, peace and safety of other persons. Section 8.68.030 then enumerates a list of sounds that are per se disturbances during specific hours — most pegged to a 9:00 p.m. to 7:00 a.m. window (musical instruments, engine repair/testing, powered model vehicles, off-road motorcycles, construction, sound equipment plainly audible at the property line). Outside that window, the general 'noise disturbance' rule in §8.68.020 still applies. Iowa Code §723.4(2) makes it a simple misdemeanor to make 'loud and raucous noise' in the vicinity of any residence or public building that intentionally or recklessly causes unreasonable distress. Sioux City's home-rule authority for this ordinance comes from Iowa Code Chapter 364.
Violation of Chapter 8.68 is, at the officer's choice, either a municipal infraction or a simple misdemeanor under §8.68.080 (penalty schedule in §1.04.100). Iowa Code §723.4 disorderly-conduct charges carry up to 30 days in jail and a fine of $105–$855 as a simple misdemeanor.
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