Sierra County, CA Noise Ordinances: Industrial Noise (2026)

Sierra County regulates industrial and resource-extraction noise through its zoning code and permit conditions rather than through a numeric industrial-noise ordinance. In the IN (Industrial) zoning district, Sierra County Code Section 15.12.150 expresses the intent to accommodate industrial uses but to keep out uses that 'may produce visible gases, particulates, steam heat, odor, dust or excessive noise,' guiding which uses are appropriate in the district. For surface mining, Sierra County Code Section 33.05.150 (Site development and operational requirements) provides that a 'noise and/or visual buffer or screen shall be provided along any road rights-of-way and along any property lines as required by conditions of approval,' tying noise control to the conditions placed on each mining permit. Similarly, the county's natural-resource-industry policy chapter (SCC 14.16) acknowledges that resource industries produce noises, odors, and dust as normal incidents of operation. None of these provisions sets a fixed industrial decibel limit; instead, they rely on zoning compatibility findings and case-by-case conditions of approval. Industrial operators in unincorporated Sierra County should expect noise to be addressed as a condition of their use permit or surface-mining permit, with the 'excessive noise' standard interpreted by the Planning Department, rather than measured against a code-wide dBA threshold.