Ontario, CA Data Centers & Crypto Mining: Data Center Noise Limits (2026)
Key Facts
- Code
- Muni Code Sec. 5-29.04
- Single-family home
- 65 day / 45 night
- Industrial land
- 70 dBA any hour
- Commercial
- 65 day / 60 night
- Peak rule
- Standard + 20 dBA max
Summary
Ontario caps exterior noise by receiving zone under Municipal Code Sec. 5-29.04: 65 dBA daytime and 45 dBA overnight at single-family homes, and 70 dBA at any hour on industrial land. A data center's cooling and generators must meet the nearest receiver's limit.
It is unlawful for any person at any location within the incorporated area of the City to create noise, or to allow the creation of any noise on property owned, leased, occupied or otherwise controlled by such person, which noise causes the noise level, when measured at any location on any other property, to exceed either of the following:
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-32: Current through Ordinance 3338, passed 7-21-2026).
Full Breakdown
Ontario's noise ordinance, Municipal Code Chapter 29, Sec. 5-29.04, sets exterior limits by the receiving property's noise zone, measured at the affected property. Zone I single-family homes: 65 dBA (7 a.m.-10 p.m.), 45 dBA (10 p.m.-7 a.m.). Zone V manufacturing and industrial land: 70 dBA at all hours. A maximum instantaneous level may not exceed the standard plus 20 dBA. At a boundary between two zones the lower standard applies, so a data center's continuous chillers and backup generators are bound by the 45 dBA overnight floor where the site abuts homes.
Violations & Fines
Noise over the Sec. 5-29.04 limits is a Municipal Code violation enforced by the City through citations, and can breach noise conditions attached to a project's entitlements.
Frequently Asked Questions
How loud can a data center be in Ontario, CA?
What noise rule protects homes near an Ontario data center?
Sources & Official References
Other rules in Ontario
California rules heatmap·Compare Ontario to another location·View the California data centers & crypto mining overview
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