Stationary equipment like data-center cooling systems must meet Mesa's noise caps measured at the property line: 60 dBA in residential zones, 65 dBA commercial, and 70 dBA industrial, averaged as Leq. Section 11-31-36 adds mandatory sound studies and generator controls.
Mesa City Code Section 6-12-5(A) sets A-weighted noise limits measured as an Leq at the receiving property line: 60 dBA for residential districts, 65 dBA for commercial, and 70 dBA for agricultural and industrial (M-1, M-2) districts. Section 6-12-5(D)(3) applies these limits to stationary machinery, pumps, blowers, and fans, which covers data-center cooling equipment and mechanical systems. Because Section 11-31-36 requires a 400-foot residential separation, noise crossing into a residential property line is held to the 60 dBA cap. Section 11-31-36 also requires a sound study within 30 days of the certificate of occupancy and annually for five years, measured during peak routine operation, and restricts backup-generator operating hours to normal operation plus utility demand-response events.
Exceeding the property-line dBA limits or skipping required sound studies draws civil sanctions of $150-$1,500 per citation, escalating with repeat findings. Each day of violation is a separate offense, enforced by Mesa code compliance.
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