Cross Mountain Noise from Specific Sources: Generator Noise Rules (2026)

Winter Storm Uri in February 2021 and recurring summer ERCOT conservation calls have driven widespread home standby generator installation across Bexar County. In unincorporated areas, a generator install requires an electrical permit through Bexar County Public Works and must meet the National Electrical Code and NFPA 37 clearances from combustibles (5 feet from structure for many models). There is no noise setback, no dBA limit, and no hours-of-operation rule at the county level. Portable generators used during outages are not permitted and not restricted by dBA. TX Penal Code 42.01 applies only to unreasonable sustained operation, and courts generally regard emergency-power generator use during outages as reasonable. Inside the City of San Antonio, Chapter 21 fixed-source dBA limits apply to standby generators during normal operation and weekly exercise cycles; residents often program generator self-test to mid-morning hours (10 AM to noon) to avoid complaints. CPS Energy customers in suburban areas of Helotes, Leon Valley, and Live Oak report generator noise most often during weekly tests; enclosure kits and sound blankets drop most units from 70+ dBA to 55 to 65 dBA at 23 feet. Commercial standby generators at strip centers and apartment complexes may be subject to TCEQ 30 TAC 101.4 if test cycles disturb nearby homes.