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Nevada County, CA Data Centers & Crypto Mining: Data Center Noise Limits (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Governing Standard
GP Noise Element Table 9.1
Residential Receptor
55 day / 50 eve / 45 night
Rural Receptor Night
40 dBA Leq
Industrial Zone Value
80 dBA Leq any time
Measured At
Sensitive-use property

Summary

Nevada County's General Plan Noise Element (Policy 9.1.2, Table 9.1) sets the noise ceiling. Data-center cooling and generators are measured at a neighboring home or school, where the limit is 55 dBA Leq daytime and 45 dBA Leq at night - 40 dBA at night for rural land.

These county ordinances apply to unincorporated areas of Nevada County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

The above standards shall be measured only on property containing a noise sensitive land use as defined in Policy 9.8 and may be measured anywhere on the property containing said land use.

Source: Nevada County Code, Title 12 (Zoning) & General Plan Noise ElementView official code

Full Breakdown

Nevada County has no standalone noise ordinance; the General Plan Noise Element governs, applied through use-permit and CEQA review. Table 9.1 assigns 80 dBA Leq to M1/M2 industrial land, but note c measures the standard only on property containing a noise-sensitive land use - a residence, school, or hospital - anywhere on that property. So a data center's chillers and generators are held to the receptor limit: 55 dBA Leq daytime, 50 dBA evening, and 45 dBA Leq at night for residential land, or 40 dBA at night for rural land. Section 12.02.050 also bars M1 noise detectable outside the building above the Commercial standard. Projects likely to exceed them must submit a comprehensive noise study (Policy 9.1.13).

Violations & Fines

There is no fine schedule. The Planning Department enforces the standards through compliance inspections and complaints under Policy 9.1.3. A permitted data center that breaches its noise conditions faces notices of violation, required mitigation, and use-permit revocation.

Frequently Asked Questions

How loud can a data center be in unincorporated Nevada County?
At a neighboring home, one-hour noise cannot exceed 55 dBA Leq daytime or 45 dBA Leq at night under General Plan Table 9.1; on rural land the nighttime limit drops to 40 dBA Leq.
Isn't industrial land allowed 80 dBA?
The 80 dBA figure only applies when measured on the industrial property itself. The county measures noise at the nearest home or school, so the receiving property's lower residential or rural limit is what actually governs a data center.

Sources & Official References

Other rules in Nevada County

Noise Ordinances: Construction HoursFew RestrictionsData Center Zoning & SitingSome RestrictionsNoise Ordinances: Vehicle NoiseSome RestrictionsNoise Ordinances: Decibel LimitsSome RestrictionsNoise Ordinances: Aircraft NoiseLight RestrictionsNoise Ordinances: Amplified Music & Outdoor SoundSome RestrictionsParking Rules: Abandoned VehiclesLight Restrictions

All Nevada County rules

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