Maricopa, AZ Noise Ordinances: Decibel Limits (2026)

Maricopa's general nuisance rules rely on an audibility test rather than a single citywide decibel cap, but its zoning code does establish numeric standards. MCC 18.110.050 states that no use or activity permitted by the zoning code may create noise exceeding the limits in Table 18.110.050.G (Exterior and Interior Noise Limits); these limits do not apply to automobile traffic or other mobile sources in the public right-of-way. The standard includes duration adjustments to the maximum allowable level (L50): noise lasting no more than 15 cumulative minutes per hour may exceed the limit by 5 dB; no more than 5 minutes per hour by 10 dB; and no more than 1 minute per hour by 15 dB. If a noise contains a steady tone, is repetitive (such as hammering), or contains music or speech, the allowable level is reduced by 5 dB. Where the ambient level at a noise-sensitive use is 10 dBA or more below the standard, the allowable standard is reduced by 5 dB. New noise-sensitive uses (schools, hospitals, churches, residences) must incorporate attenuation to achieve and maintain an interior level of 45 dBA. The zoning administrator may require an acoustic study (24-hour minimum measurement) for projects that could exceed the limits. The exact table values are published within MCC 18.110.050 itself.