634.07 IMMEDIATE THREATS TO HEALTH AND WELFARE. 
   (a)   No person shall operate or cause to be operated, or permit, on public or private property, any source of continuous and/or impulsive sound in such a manner as to create a sound level which exceeds the limits set forth in either of the following tables when measured at a distance of fifty feet or fifteen meters or more from such source, thereby posing an immediate threat to health and welfare:
Continuous Sound Levels*
Sound Level Limit (dBA)
Duration
90
24 hours
93
12 hours
96
6 hours
99
3 hours
102
1.5 hours
105
45 minutes
108
22 minutes
*Use equal energy time-intensity trade-off if level varies; find energy equivalent over twenty-four hours.
Impulsive Sound Levels

Sound Level Limit ( dB )
Number of Repetitions
per 24-Hour Period
145
1
135
10
125
100
   (b)   Whoever violates this section is guilty of a misdemeanor of the fourth degree. A separate offense shall be deemed committed each day during or on which a violation occurs or continues. Punishment shall be as provided in Section 698.02.
(Ord. 1986-157. Passed 11-3-86.)