Quiet hours in Des Plaines, IL — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Des Plaines City Code 6-2-7(E)(3) sets quiet hours from 10:00 P.M. to 7:00 A.M. on weeknights, and from 11:00 P.M. to 10:00 A.M. before Saturdays, Sundays, and official city holidays. During quiet hours, sound crossing a lot line above 50 dBA (or 40 dBA inside another structure) is excessive noise.
Des Plaines uses a decibel-keyed quiet-hours regime codified in City Code Title 6, Chapter 2, Section 6-2-7 (Noise). Section 6-2-7(E)(3) defines 'quiet hours' as 'the period of time beginning at ten o'clock (10:00) P.M. and ending at seven o'clock (7:00) A.M. the following day, unless the following day is a Saturday, Sunday or official city holiday, in which case quiet hours means the period of time beginning at eleven o'clock (11:00) P.M. and ending at ten o'clock (10:00) A.M. the following day.' The listed official city holidays are New Year's Day, Martin Luther King Day, Presidents' Day, Memorial Day, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving Day, the day after Thanksgiving, and Christmas. During quiet hours, Section 6-2-7(E)(4) makes it excessive noise for sound from a property to exceed 50 dBA at or beyond the lot line, or 40 dBA inside another structure; for sound from a source not on a property (such as a vehicle on the right of way) the threshold is 50 dBA more than 30 feet away. Only trained police or authorized city employees using an ANSI type 1 or type 2 sound meter take the measurements (6-2-7(E)(1)-(2)).
Violators are fined under the general penalty in City Code Title 1, Chapter 4, for each offense (6-2-7(G)).
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