Unincorporated Lake County, Indiana sets numeric boundary decibel limits (Code § 93.03): 55 dBA at all times for residential and commercial zones and 66 dBA for industrial zones, measured at the property boundary. Perceptible earth-shaking vibrations beyond the boundary are also prohibited.
Lake County Code § 93.03 imposes boundary sound-pressure caps that apply at all times, not just at night. A person may not cause noise to exceed 55 dBA at any point on the property boundary if located in a residential zone or a commercial zone, or 66 dBA if located in an industrial zone. If a property boundary lies between two zones, the lower limit applies regardless of where the noise-maker is. The chapter also bars, in residential and commercial zones, any earth-shaking vibrations perceptible without instruments beyond the property boundary. Appendices to Chapter 93 provide octave-band SPL breakdowns of these dBA limits. These limits govern unincorporated Lake County; municipalities set their own.
Exceeding the § 93.03 boundary decibel limits is punished under the general penalty § 10.99, enforced by the Lake County Police Department with citations filed in Lake Superior Court, County Division. Each measurement point on the boundary can establish a
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