San Mateo County, CA Noise Ordinances: Leaf Blower Rules (2026)
Key Facts
- County leaf-blower ban
- None in unincorporated areas
- City bans
- City-level only (e.g., City of San Mateo)
- Governing county rule
- Code 4.88.330 / 4.88.350
- State law
- CARB / AB 1346 phase-out of new gas SORE sales
- Enforcement
- Sheriff / Code Enforcement (650) 363-4825
Summary
Unincorporated San Mateo County has no dedicated gas-powered leaf blower ban or specific leaf-blower ordinance; the recent leaf-blower bans and electric-blower rebate programs are city-level (e.g., City of San Mateo, Atherton, Redwood City). In unincorporated areas, blowers are governed by the general Chapter 4.88 noise standards.
Existing law imposes various limitations on the emissions of air contaminants for the control of air pollution from vehicular and nonvehicular sources. Existing law assigns the responsibility for controlling vehicular sources of air pollution to the State Air Resources Board. This bill would require the state board, by July 1, 2022, consistent with federal law, to adopt cost-effective and technologically feasible regulations to prohibit engine exhaust and evaporative emissions from new small off-road engines, as defined by the state board. The bill would require the state board to identify and, to the extent feasible, make available funding for commercial rebates or similar incentive funding
Full Breakdown
Research of the County Code did not find any County leaf-blower ordinance applicable to unincorporated San Mateo County. The well-publicized leaf-blower regulations in San Mateo County are adopted by individual incorporated cities: the City of San Mateo adopted an ordinance prohibiting gas-powered leaf blowers (with a later effective date) and runs an electric-blower rebate, and cities such as Atherton and Redwood City offer rebates for electric leaf blowers. None of these city measures govern the unincorporated communities. In unincorporated areas, leaf-blower noise is instead subject to the County's general framework: the exterior noise standards in Section 4.88.330 and the General Noise Regulation in Section 4.88.350, which prohibit unreasonably loud noise that disturbs the peace. Statewide, California's small off-road engine restrictions (CARB regulations implementing AB 1346) phase out new sales of gas-powered equipment, but that is a state product-sales rule rather than a county use ordinance. Residents seeking a specific leaf-blower restriction should confirm current rules with County Planning.
Violations & Fines
Because there is no specific county leaf-blower ordinance, complaints are handled under Chapter 4.88's general noise provisions by the Sheriff and County Code Enforcement (650) 363-4825. Excessive blower noise can be cited as an unreasonable noise under 4.88.350.
Frequently Asked Questions
Are gas leaf blowers banned in unincorporated San Mateo County?
Does any state law affect leaf blowers?
Sources & Official References
Other rules in San Mateo County
How San Mateo County compares: Cities with the Strictest Leaf Blower Rules·California rules heatmap·Compare San Mateo County to another location·View the California noise ordinances overview
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