National City Municipal Code Ch. 12.08 Interior Noise Limits

A. No person shall operate or cause to operate any source of sound within a residential dwelling unit within a multifamily residential structure consisting of two or more dwelling units, or allow the creation of any noise on property owned, leased, occupied or otherwise controlled by such person, which thereby causes the noise level at the adjacent interior boundary wall of an affected property to exceed the applicable noise level limits given in Table IV.

B. If the ambient noise level inside the receiving dwelling unit exceeds that permissible within any of the noise limit categories in Table IV, the allowable noise exposure standard in that category shall be the measured ambient for a cumulative period of five minutes in any hour, ambient plus five dB(A) for one minute in any hour and shall not exceed the ambient plus ten dB(A) at any time.

(Ord. 2188 § 2, 2001)

In the event an alleged offensive noise event contains a steady, audible tone such as a whine, screech, or hum, or is an impulsive and repetitive noise such as hammering or riveting, or contains music or speech, the standard limits set forth in Table IV shall be reduced by five dB.

(Ord. 2188 § 2, 2001)

TABLE IV