Lake County's zoning performance standards (Article 41, Section 41.11, Table 11.1) cap noise received at a residential property at 55 dBA daytime and 45 dBA at night, measured beyond the property line of the source. Data center cooling and generators must meet these one-hour limits.
Lake County has no noise rule written for data centers, so a facility's cooling fans, chillers, and backup generators fall under the countywide zoning performance standards in Article 41, Section 41.11. Table 11.1 sets one-hour sound levels by the receiving property's zoning: residential (including agricultural and resource land) 55 dBA daytime and 45 dBA at night; commercial 60/55; industrial 65/60. Under Table 11.2, when the receptor is a dwelling, hospital, school, library, or nursing home - even on industrial land - the limits drop to 57 dBA daytime and 50 dBA at night. Levels are measured beyond the source property's lines. Because a data center runs around the clock, the 45 dBA nighttime residential cap is the binding constraint.
One-hour noise above the Table 11.1 limit for the receiving zone - 45 dBA at night for residential, or 50 dBA at a nearby home under Table 11.2 - measured beyond the source property's lines.
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