Mount Prospect, IL Public Conduct: Loud Party Ordinance (2026)

The Mount Prospect Village Code has no party-specific noise section in the provisions read for this page. The rule that reaches a loud gathering is § 23.101, Disorderly Conduct. Subsection A makes it unlawful to disturb the peace and quiet of the Village or any portion of it by disorderly conduct, and subsection B15 defines one form of that conduct as making continuous, or causing to be made, by shouting or outcry, or by a horn, bell, radio, loudspeaker, amplifying system or any other instrument or device, any unreasonably loud, disturbing and unnecessary noise. The provision reaches the streets, alleys, parks and other public places of the Village and also private premises in the Village.

The test has three parts printed in the text. The noise must be of such character, volume, intensity and duration as to be plainly heard upon the streets, alleys, parks or other public places. It must disturb the peace and quiet of the Village or any portion thereof, or be detrimental to the life and health of any individual. Because the standard is what can be heard from public places, a party inside a house is covered when the sound carries out to the street.

The same conduct also falls under the nuisance article. Section 23.1403 H makes it a nuisance to produce or permit to be produced, in or upon any premises in the village, any offensive noise which disturbs the peace or quiet of the neighborhood or of any person residing in the vicinity, and it lists § 23.101B15 among the provisions it includes. Under § 23.1402 each obligation in that article is the joint and several liability of every owner and responsible party, and § 23.1401 defines responsible party to include owners, tenants, occupiers, property managers and lessees.

Host liability for alcohol is a separate rule. Section 13.508 B makes it unlawful for any person to knowingly permit, or to knowingly or negligently fail to immediately prevent or stop, on premises under his or her control, the consumption of an alcoholic beverage by an underage person. It applies to residential, public and commercial premises. If a person over twenty one (21) years of age is in a residence where underage drinking is occurring, negligence is presumed and the burden of proving that the person was not negligent falls on that person. Section 13.508 D adds vicarious liability to anyone injured by an alcohol impaired underage person.