Industrial noise in Pasco is capped by PMC 9.130.040, adopting WAC 173-60-040: an industrial (Class C) source may send up to 70 dBA into other industrial property, 65 dBA into commercial, and 60 dBA into residential, with a 10 dBA nighttime reduction for residential receivers.
Industrial noise in Pasco is governed by the maximum permissible environmental noise levels in PMC 9.130.040, which adopts Washington State's standard, WAC 173-60-040. Under the EDNA system, industrial zones are Class C, commercial zones are Class B, and residential zones are Class A. A Class C (industrial) noise source may send up to 70 dBA into another Class C (industrial) property, up to 65 dBA into Class B (commercial) property, and up to 60 dBA into Class A (residential) property. Between 10:00 p.m. and 7:00 a.m., these limits are reduced by 10 dBA for receiving property within residential (Class A) EDNAs, so an industrial operation must hold noise crossing into a neighboring residential property to roughly 50 dBA at night. Brief exceedances are permitted: +5 dBA for up to 15 minutes, +10 dBA for up to 5 minutes, or +15 dBA for up to 1.5 minutes per hour. The state framework Pasco adopts also provides exemptions for certain utility and stationary equipment (for example, electrical substations and existing equipment used to convey water, wastewater and natural gas). Because Pasco incorporates WAC 173-60 by reference, these industrial limits are enforceable through the city's own code with the figures set at the state level.
Industrial noise exceeding the WAC 173-60-040 limits adopted in PMC 9.130.040 is a violation; daytime industrial-to-residential noise is capped at 60 dBA, dropping ~10 dBA at night.
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