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Martin County, FL Data Centers & Crypto Mining: Data Center Noise Limits (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified October 2026

Key Facts

Industrial and agricultural limit: 70 dB(A) day, 65 dB(A) night
Residential limit: 60 dB(A) day, 55 dB(A) night
Commercial limit: 65 dB(A) day, 60 dB(A) night
Day hours: 7:00 a.m. to 9:00 p.m.
Measurement period: At least 10 continuous minutes at the receiving property line
Civil infraction fines: $100, then $300, then $500 per violation
Variance body: Board of Zoning Adjustment, after public hearing

Summary

Martin County caps sound from any source, including a data center's chillers, cooling fans and generators, by the land use that receives it. Industrial and agricultural receiving parcels are held to 70 dB(A) from 7:00 a.m. to 9:00 p.m. and 65 dB(A) overnight, while residential parcels are held to 60 and 55 dB(A). Readings are taken at the receiving property line.

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

Maximum permissible sound levels by receiving land use are set forth in table 1. It shall be unlawful to operate or cause to be operated any source of sound or to project a sound or noise across a real property boundary in such a manner as to create a sound level which exceeds the limits set forth for the receiving land use designation in table 1 when measured at or within the property line of the receiving land use designation. ... Institutional Includes the following designations: General Institutional, Recreational, and Public Conservation 7:00 a.m.—9:00 p.m. 9:00 p.m.—7:00 a.m. 55 dB(A) 50 dB(A) Residential Includes the following designations: Rural, Estate, Low, Medium, High and Mobile Home Densities 7:00 a.m.—9:00 p.m. 9:00 p.m.—7:00 a.m. 60 dB(A) 55 dB(A) Commercial Includes the following designations: General, Limited, COR, and Waterfront Commercial 7:00 a.m.—9:00 p.m. 9:00 p.m.—7:00 a.m. 65 dB(A) 60 dB(A) Industrial 7:00 a.m.—9:00 p.m. 9:00 p.m.—7:00 a.m. 70 dB(A) 65 dB(A) Agricultural 7:00 a.m.—9:00 p.m. 9:00 p.m.—7:00 a.m. 70 dB(A) 65 dB(A)

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 62 | Land Development Regulations: Supplement 62).

Full Breakdown

Sec. 67.306 of the Martin County Code of Ordinances makes it unlawful to operate any source of sound, or to project sound across a real property boundary, above the table 1 limit for the receiving land use designation, measured at or within that property line. The noise article does not name data centers, so a facility's rooftop chillers, cooling fans, transformers and backup generators are judged like any other sound source in unincorporated Martin County. What sets the number is who receives the sound, not how the data center parcel is zoned.

Day hours run 7:00 a.m. to 9:00 p.m. and night hours run 9:00 p.m. to 7:00 a.m. Institutional parcels (General Institutional, Recreational and Public Conservation) are held to 55 dB(A) by day and 50 dB(A) at night. Residential parcels (Rural, Estate, Low, Medium, High and Mobile Home Densities) are held to 60 and 55. Commercial parcels (General, Limited, COR and Waterfront Commercial) are held to 65 and 60. Industrial and Agricultural parcels are held to 70 and 65.

Two boundary rules decide most disputes. Under 67.306.A, a residential development inside an agricultural designation takes the residential thresholds. Under 67.306.B, when a source can be identified and measured in more than one land use designation, the pressure level limits of the most restrictive use district apply at that boundary, so an industrial data center beside homes answers to 60 and 55 dB(A) at the homes' property line, not 70 and 65.

Table 2 then corrects the limit for the character of the sound. A source that runs continuously 1 minute or less in any hour gets +15 dB(A), 5 minutes or less gets +10, and 15 minutes or less gets +5, with one correction only. A repetitive impulse source, a pure tone, or a cyclically varying amplitude loses 5 dB(A), so an industrial receiving parcel's 65 dB(A) night limit would drop to 60 for a tonal source.

Sec. 67.304 sets the test: a sound level meter reading of not less than ten continuous minutes at the property boundary of the receiving parcel, or from the receiving premises in multifamily developments.

Violations & Fines

Code inspectors enforce the article under F.S. ch. 162, either part I, following chapter 1, article 4 of the County Code, or part II as a civil infraction, at the inspector's discretion. Under part II the fine is $100.00 for a first violation, $300.00 for a second, and $500.00 for the third and every violation after that. The penalty drops by $50.00 when the person does not contest the citation. An inspector issues a citation on reasonable cause to believe a violation occurred.

Frequently Asked Questions

Does Martin County have a separate noise limit for data centers?

No. The noise article never names data centers, so Sec. 67.306 table 1 applies to a data center like any other source of sound in unincorporated Martin County. The facility's own zoning does not set the number. The land use designation of the parcel receiving the sound sets it, and the reading is taken at or within that receiving property line.

What limit applies if the data center is industrial but the neighbor is residential?

The residential limit controls at the shared boundary. Section 67.306.B applies the pressure level limits of the most restrictive use district when a source is measured in more than one land use designation, so the plant must meet 60 dB(A) from 7:00 a.m. to 9:00 p.m. and 55 dB(A) from 9:00 p.m. to 7:00 a.m. there, before any table 2 correction.

How does the County measure the noise?

An inspector uses a sound level meter for not less than ten continuous minutes at the property boundary of the receiving parcel. In multifamily developments, including duplexes, the reading is taken from the receiving premises. Sec. 67.304 leaves instruments, personnel and reporting procedures to a resolution of the Board of County Commissioners, which the Board can amend as measuring technology changes.

Can an operator get a variance from the noise limits?

Yes. Sec. 67.308 sends the request to an administrative hearing before the Board of Zoning Adjustment, after newspaper notice at least 15 days ahead and return-receipt mail notice at least ten days ahead to owners within 300 feet. The applicant must show a need for time to comply, a pre-existing use that has cut noise as far as feasible, or a temporary activity that cannot comply. The Board sets conditions such as sound level limit, hours and duration.

Which noises are exempt under the Martin County article?

Sec. 67.307 exempts authorized safety signals, emergency vehicles, emergency work after a public calamity, mosquito control, County-approved refuse collection, bona fide agricultural operations (excluding broadcast equipment), public works construction or maintenance, and construction tools used 7:00 a.m. to 9:00 p.m. on permit-required sites. Data center cooling equipment is not on the list.

Sources & Official References

[1]Martin County Code of Ordinances, Chapter 67 Environmental Control (Municode)

Other rules in Martin County

Animal Ordinances: Chickens & LivestockSignificant Restrictions Fence Regulations: Height LimitsSome Restrictions Noise Ordinances: Aircraft NoiseLight Restrictions Parking Rules: Loading ZonesSome Restrictions Fence Regulations: Material RestrictionsSome Restrictions Animal Ordinances: Cat RulesSome Restrictions

All Martin County rules

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