Kootenai County, ID Data Centers & Crypto Mining: Data Center Noise Limits (2026)
Key Facts
- Noise plan required
- Prepared by acoustical engineer
- Standard cross-referenced
- LUDC 8.4.1304(H)
- Measured at
- Plant property line, worst-case elevation
- Limits
- By octave band, 97 to 35 decibels
- Required before
- Conditional use permit approval
Summary
A data center in unincorporated Kootenai County has to prove, before it ever opens, that its cooling and power equipment will not push noise past the county's industrial-zone sound table. LUDC 8.5.138(C)(7) requires an acoustical engineer's noise mitigation plan tied to the decibel limits already set for Light Industrial and Industrial zone uses in LUDC 8.4.1304(H).
8.5.138(C): ... 7. A noise mitigation plan prepared by an acoustical engineer that ensures that the anticipated noise level of the facility will not exceed the standards listed in subsection 8.4.1304(H) of this title. ... 8.4.1304: H. Noise: 1. Noise emissions from any site shall not cause sound pressure levels greater than those listed in column 3 below, measured at any point beyond the plant property line, either at ground level or at a habitable elevation, whichever is more restrictive.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-10: Code current through: Ord. 633, passed December 23, 2025).
Full Breakdown
138. 1304(H) of the title, before the county will approve the permit. 1304(H), the noise standard shared by every Light Industrial and Industrial zone use, sets sound pressure limits by octave band, measured at the plant's property line at whichever elevation is more restrictive, ground level or a habitable floor. 5 cycles per second, in the least restrictive column down to as low as 35 decibels at 8,000 cycles per second in the most restrictive column, and impact noise cannot exceed 83 decibels under the same column structure.
Measurements have to be taken with a sound level meter and octave band analyzer built to American Standards Association specifications, using the meter's flat network, with a separate impact noise analyzer for impact noise. Because the data center's own noise plan has to be engineered to those numbers before construction, a facility whose generators, transformers, or cooling towers would blow past the applicable column has to redesign, add sound attenuation, or relocate equipment before the county will sign off, rather than facing enforcement only after the fact.
Ongoing operation still has to hold to that same table for as long as the facility runs. (Ord. 620, 10-2-2025; noise table at Ord. 493, 6-9-2016)
Violations & Fines
A data center whose actual operating noise exceeds the octave-band limits in LUDC 8.4.1304(H), the standard its own permit-stage noise mitigation plan was required to meet under 8.5.138(C)(7), is out of compliance with its conditional use permit. Kootenai County's general penalty, Code 1-4-1, applies absent a more specific fine: up to $1,000, up to six months in jail, or both, with the county able to revisit the permit itself for a continuing violation.
Frequently Asked Questions
Does Kootenai County set a specific decibel limit for data centers?
When does the noise study have to be done?
What happens if a running data center turns out to be too loud?
Sources & Official References
Other rules in Kootenai County
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