Clark County applies Washington's WAC 173-60 environmental noise limits. At a residential (Class A) property the maximum is 55 dBA from another residence, 57 dBA from commercial, and 60 dBA from industrial sources, reduced 10 dBA (to 45 dBA) between 10 p.m. and 7 a.m.
CCC 9.14.010 states that proof of violating the WAC 173-60 noise limits is prima facie evidence of a county violation. WAC 173-60-040 sets maximum permissible levels by the receiving property's EDNA class. For Class A (residential) receiving property the limits are 55 dBA (residential source), 57 dBA (commercial), and 60 dBA (industrial). Short exceedances are allowed: 5 dBA for 15 minutes, 10 dBA for 5 minutes, or 15 dBA for 1.5 minutes in any hour. Nighttime limits drop 10 dBA at residences.
Exceeding WAC 173-60 levels is prima facie proof of a CCC 9.14.010 misdemeanor: $250 fine and/or 90 days jail; state Ecology may also enforce WAC 173-60.
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