San Joaquin County caps stationary-source noise at a receiving property at 50 dB Leq during the day and 45 dB Leq at night, with maximum levels of 70 and 65 dB, under Development Title Table 9-1025.9. A data center's chillers and backup generators must meet these limits.
San Joaquin County has no noise rule written for data centers, so a facility's chillers, cooling fans, and diesel backup generators are held to the countywide stationary-source standards in the Development Title, Section 9-1025.9 and Table 9-1025.9, Part II. The hourly equivalent level (Leq) may not exceed 50 dB daytime (7 a.m. to 10 p.m.) or 45 dB nighttime (10 p.m. to 7 a.m.), and the maximum level (Lmax) may not exceed 70 dB day or 65 dB night, applied at the receiving property line where no outdoor activity area is defined. Each standard drops 5 dB for tonal or impulsive noise.
Cooling or generator noise exceeding 50 dB Leq by day or 45 dB by night at a receiving property violates Section 9-1025.9; the county can require mitigation, and unmitigated impacts can condition or block approval under CEQA.
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