Chino Hills caps exterior noise at the receiving property under Municipal Code Section 16.48.020: 60 dBA day and 45 dBA night at single-family homes, 75 dBA day and 70 dBA night on industrial land. Tonal equipment noise drops each limit five dBA.
Table 16.48-1 sets maximum Leq levels measured on the receiving property, not at the source. Single-family residential is 60 dBA from 7 a.m. to 10 p.m. and 45 dBA overnight; multi-family 65/45; commercial and institutional 70/60; manufacturing and industrial 75/70. Each limit drops five dBA for impulsive noise, tonal noise, and speech or music, so a data center's chillers and generators face 40 dBA overnight at the nearest home. The standard applies to a cumulative thirty minutes in any hour, with higher thresholds for shorter durations. Section 16.48.060 also governs mechanical equipment.
Exceeding the Table 16.48-1 limits is a Development Code violation enforced by Chino Hills Code Enforcement, and breaches the noise conditions attached to a project's Site Plan or Conditional Use Permit.
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