In unincorporated Sonoma County, recreational vehicles and boats are treated under the Sonoma County Zoning Code (Chapter 26) and Chapter 18 (Motor Vehicles and Traffic). Personal RVs, trailers, and boats may be stored on a private residential parcel as a customary accessory use, but they cannot be occupied as a dwelling on residential land except under narrow exceptions in Sec. 26-88-066 (use of an RV by an ill, convalescent, or otherwise disabled friend or relative needing care from the property occupant) or on parcels with a KR/RV Combining District designation governed by Article 42 of Chapter 26. On-street parking in unincorporated areas is subject to the California Vehicle Code 72-hour rule (CVC Sec. 22651(k)) and Sonoma County's parallel parking limitations - an RV, trailer, or boat left on a public right-of-way for more than 72 hours without being moved is subject to citation and removal. Commercial RV storage yards, marinas, and dry-stack boat storage are land uses that require their own zoning approval (typically a use permit) and are not permitted as-of-right on residential lots. Park-model and travel-trailer occupancy as full-time housing is restricted to permitted mobile home parks, RV parks with the KR/RV combining designation, or properties operating under an approved temporary-use permit (often issued during post-fire rebuilding under Permit Sonoma's Rebuild program established after the 2017 Tubbs, 2019 Kincade, and 2020 Glass fires).
Sonoma County does not adopt a single 'RV parking ordinance' for residential lots; instead, RV and boat storage is regulated through several overlapping provisions. Chapter 26 (Zoning) treats storage of personal recreational vehicles, travel trailers, fifth-wheels, motor homes, and boats as a customary accessory use to a single-family dwelling, allowed in any residential, agricultural, or rural zoning district (R1, R2, R3, AR, RR, LIA, LEA, DA, RRD) as long as the vehicles are owned by the resident, are not used for permanent habitation, and do not generate commercial activity. Sec. 26-88-066 (Temporary Use of Recreational Vehicles) is the principal exception that allows temporary occupancy of an RV on residential property when the occupant is an ill, convalescent, or otherwise disabled friend or relative of the property's permanent resident needing care from the occupant - this provision was retained when the County rewrote Article 88 in the 2020-2024 zoning update. The KR/RV (Keeping of Recreational Vehicles) Combining District in Article 42 of Chapter 26 allows commercial RV parks and longer-term RV occupancy on parcels specifically zoned for that use; such parcels are mapped and require a use permit through Permit Sonoma. Sec. 26-86-010 (Required Parking) sets off-street parking minimums for new residences and accessory structures but does not require dedicated RV pads; if a homeowner wants to install a paved RV pad in the side or rear yard, no zoning permit is typically required so long as the pad does not exceed lot-coverage limits, the RV is not connected to permanent utilities for occupancy, and any drainage changes are below the building-permit threshold in Chapter 7 (Building Regulations). Front-yard storage of RVs and boats is constrained by Article 88's accessory-structure setback rules, which prohibit placement of structures (interpreted to include long-term-parked RVs and boats on trailers when they form a functional outbuilding) within the required front-yard setback - typically 20 to 30 feet from the front property line depending on zone. The 72-hour on-street parking limit comes from California Vehicle Code Sec. 22651(k) and is enforced by the Sonoma County Sheriff's Office and California Highway Patrol on county roads; vehicles repeatedly moved a few feet to evade the limit are still subject to citation under CVC Sec. 22651(l). Post-fire, Permit Sonoma's Rebuild program (operated out of the Resiliency Permit Center at 2550 Ventura Avenue, Santa Rosa) issues temporary-use permits authorizing residents to occupy an RV or travel trailer on their parcel for up to 24 months while rebuilding the destroyed primary dwelling, with extensions available; permitted Rebuild RVs must demonstrate adequate water and sewer/septic connections and meet defensible space and Chapter 7A fire-safety requirements applicable to the parcel. Coastal Zone parcels (CC suffix) are subject to Chapter 26C (Local Coastal Program) which adds Coastal Commission considerations for any RV park or extended-stay RV occupancy near the Pacific shoreline or Russian River mouth.
Occupying an RV, travel trailer, or fifth-wheel as a dwelling on a residential parcel outside the Sec. 26-88-066 caregiver exception, the KR/RV combining district, or a Rebuild temporary-use permit is a zoning violation enforceable by Permit Sonoma Code Enforcement under Chapter 1 (General Provisions) and Chapter 26 (Zoning). Administrative citations under Sec. 1-7 start at $100 for a first offense, $200 for a second, and $500 per day for each continuing day, plus abatement costs and lien recordation; persistent or egregious violations can be charged as misdemeanors. Leaving an RV, boat, or trailer parked on a public county road for more than 72 hours without being moved violates California Vehicle Code Sec. 22651(k) and is subject to citation and tow by the Sheriff or CHP. Operating a commercial RV park, dry-stack boat storage facility, or RV storage yard without an approved use permit on non-KR/RV-zoned land is a separate zoning violation and may also trigger Business License, Health Department, and stormwater permit enforcement. RV occupancy without an approved septic or sewer connection can also violate Sonoma County Code Chapter 24 (Onsite Wastewater Treatment Systems) and California Health and Safety Code Sec. 17920.3 (substandard housing). Coastal Zone violations may trigger additional enforcement by the California Coastal Commission with penalties up to $15,000 per violation per day under Public Resources Code Sec. 30821.
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