Chandler sets no fixed decibel cap for data centers; instead a data center's sound may not exceed the ambient baseline noise levels measured before construction, verified by third-party acoustic engineers at the nearest residential property line. Backup generators may run only weekday daytime hours.
Under Section 35-2214, a third-party acoustic engineer must document baseline sound levels at the nearest residential (or noise-sensitive) property line before the first neighborhood meeting. The data center must be designed so its sound does not exceed that ambient baseline, with mitigation specifications submitted before building permit approval. A post-occupancy noise study is required, then repeated annually during peak mechanical operation for five years. An on-site liaison must field noise complaints daily from 8 a.m. to 10 p.m. Backup generators may operate only 9 a.m. to 5 p.m., Monday through Friday (excluding holidays), unless covering a power outage, with 24-hour public notice.
Failing the baseline sound standard, mitigation design, annual noise studies, or generator hours is a Zoning Code violation enforced by Development Services and the Zoning Administrator. An on-site liaison must respond to noise complaints daily, 8 a.m. to 10 p.m.
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