Industrial-source noise crossing into Kennewick residential neighborhoods is capped by WAC 173-60-040 at 60 dBA during the day and 50 dBA between 10:00 p.m. and 7:00 a.m. at any Class A (residential) receiving property. The cap applies to facilities along Kennewick's industrial corridors and to operations adjacent to residential subdivisions. The Department of Ecology under RCW 70A.20 supplies the enforcement framework; the Benton Clean Air Agency separately handles air emissions but not noise.
Industrial noise inside Kennewick is governed by the Class C source to Class A receiver row of the WAC 173-60-040 maximum permissible environmental noise table: 60 dBA at any residential receiver during the day, dropping to 50 dBA between 10:00 p.m. and 7:00 a.m. (a 10 dBA nighttime reduction for residential receivers). WAC 173-60-040(2) allows short exceedances - 5 dBA over for 15 minutes per hour, 10 dBA over for 5 minutes, and 15 dBA over for 1.5 minutes - to accommodate brief loud events without triggering a violation. The Washington Department of Ecology under RCW 70A.20 (formerly RCW 70.107) is the primary statutory enforcer, but jurisdictions that have adopted the state standards through their local code can also enforce, and Kennewick Code Enforcement follows the public-disturbance backstop in the Kennewick Municipal Code. The Benton Clean Air Agency regulates industrial air emissions across Benton County but does not have noise jurisdiction. Common Kennewick industrial-noise sources include food-processing operations, agricultural equipment along the Columbia River corridor, and rail-yard activity; rail operations themselves are largely preempted by the federal Interstate Commerce Commission Termination Act of 1995.
Industrial-noise violations of WAC 173-60-040 caps are enforceable by the Washington Department of Ecology with notice-and-correction procedures and civil penalties under RCW 70A.20. Repeat or willful violations may trigger formal administrative orders. Local public-disturbance enforcement by Kennewick Code Enforcement operates independently as a civil-infraction backstop. Rail-operations noise is federally preempted by the ICC Termination Act of 1995, and Kennewick cannot enforce against in-yard rail activity.
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