Spokane Municipal Code

Title 10 Regulation of Activities

Division V. Code Enforcement and Animal Regulations

Chapter 10.70 Noise Control

Section 10.70.070 Maximum Permissible Environmental Sound Levels

1. Maximum Permissible Environmental Sounds.

For sound sources located within the city, no sound is permitted to exceed the maximum permissible exterior sound levels established by WAC 173-60. Maximum permissible sound levels are as follows:

EDNA of Noise Source	EDNA of Receiving Property
	Class A (dBA)	Class B (dBA)	Class C (dBA)
Class A	55	57	60
Class B	57	60	65
Class C	60	65	70
Class A - Residential Zones Class B - Commercial, Office, Retail Zones Class C - Industrial Zones

2. The maximum permissible sound levels established by this chapter are modified as follows:

1. 1. Reduce by ten dBA between the hours of ten p.m. to seven a.m. for receiving property in Class A EDNAs; and 

1. 2. Increase for short duration for any receiving property at any time:

1. 1. 1. Increase by five dBA for fifteen minutes (L08) in any one-hour period; or 

1. 1. 2. Increase by ten dBA for five minutes (L02) in any one-hour period; or 

1. 1. 3. Increase by fifteen dBA for one and a half minutes (Lmax) in any one-hour period; and

3. Where a receiving property lies within more than one EDNA classification, the maximum permissible sound level shall be determined by the most noise sensitive EDNA zone.

4. The point of measurement shall be at the property boundary of the receiving property.

5. Enforcing authority: code enforcement and parking services or police department.

Date Passed: Monday, October 3, 2022

Effective Date: Monday, October 3, 2022

ORD C36289 Section 5