Maricopa, AZ Noise Ordinances: Industrial Noise (2026)

Industrial and commercial noise in Maricopa is controlled by the zoning code's performance standards in MCC 18.110.050. The ordinance states that no use or activity permitted by the zoning code may create noise levels exceeding the standards in Table 18.110.050.G (Exterior and Interior Noise Limits), excluding automobile traffic and other mobile sources in the public right-of-way. The standard incorporates duration adjustments (e.g., brief noise may exceed limits by 5-15 dB) and a 5 dB reduction for steady tones or repetitive noise such as hammering or riveting, which commonly arise in industrial operations. For projects that could be exposed to or generate noise exceeding the limits, the zoning administrator may require, at the applicant's expense, an acoustic study using a minimum 24-hour measurement and standard metrics (Lmax, L02, L08, L25, L50). Projects subject to that study may be conditioned on incorporating noise-attenuation measures, with priority on site planning and project design before noise barriers are required. The public-peace ordinance MCC 9.20.010 also exempts the normal operation of railroad trains and agricultural equipment, and city operations, from its general noise prohibition, which is relevant to Maricopa's rail corridor and surrounding farmland.