Hayward, CA Data Centers & Crypto Mining: Data Center Noise Limits (2026)
Key Facts
- Code
- HMC Sec. 4-1.03.1
- Residential limit
- 70 day / 60 night
- Industrial limit
- 70 dB(A) any time
- Abutting homes
- Residential limits apply
- Measured at
- Property plane
Summary
The City of Hayward caps noise at the property plane at 70 dB(A) daytime (7 a.m.-9 p.m.) and 60 dB(A) at night (9 p.m.-7 a.m.) on residential property, and 70 dB(A) any time on industrial property. Municipal Code Section 4-1.03.1 governs a data center's cooling and generators.
No person shall produce or allow to be produced ... on residential property, a noise level at any point outside of the property plane that exceeds seventy (70) dBA between the hours of 7:00 a.m. and 9:00 p.m. or sixty (60) dBA between the hours of 9:00 p.m. and 7:00 a.m.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Municipal Code: Supplement 28 Update 1 | Charter: Supplement 1).
Full Breakdown
Hayward's noise regulations, Municipal Code Section 4-1.03.1, set limits at the "property plane." On residential property the cap is 70 dB(A) from 7 a.m. to 9 p.m. and 60 dB(A) from 9 p.m. to 7 a.m. Commercial and industrial property may reach 70 dB(A) at any hour - but industrial property that abuts residential property drops to the residential limits. Public property is capped at 60 dB(A) measured 25 feet from the source. A data center's cooling towers, chillers, and backup generators must meet the limit of the nearest receiver, so a site next to homes is bound to 60 dB(A) overnight.
Violations & Fines
Noise above the Section 4-1.03.1 limits is a code violation enforced by the City through citations and abatement, and can breach the noise conditions attached to a data center's Conditional Use Permit.
Frequently Asked Questions
How loud can a data center be in Hayward?
What noise rule protects homes next to a Hayward data center?
Sources & Official References
Other rules in Hayward
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