Fontana sets no numeric dBA property-line limit. Its noise ordinance, FMC Sections 18-62 and 18-63, bans loud, excessive, impulsive or intrusive sound audible 50 feet from the source that disturbs persons of ordinary sensibilities - so data-center chillers and generators are judged by nuisance, not decibels.
Fontana's noise ordinance sits in Municipal Code Chapter 18, Article II. Section 18-62 makes it unlawful to make loud, excessive, impulsive or intrusive sound that annoys or disturbs persons of ordinary sensibilities, and Section 18-63 declares such noise a violation when it carries 50 feet or more from the source property. Unlike San Bernardino County, which caps steady-tone equipment at 50 dBA day and 40 dBA night, Fontana fixes no numeric dBA limit and no day/night table in its ordinance. The General Plan Noise Element uses 65 dBA CNEL for land-use compatibility and CEQA review. A data center's continuous cooling and backup generators are therefore judged by the 50-foot nuisance standard.
Noise carrying 50 feet or more that disturbs neighbors violates FMC Section 18-63 and is enforced by Fontana as an infraction or misdemeanor, with administrative fines and abatement.
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See how other cities in San Bernardino County handle data center noise limits.
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