Yuba County

Yuba County Community Development and Services Agency (Planning Department and Building Department) issues ADU permits for unincorporated parcels including Linda, Olivehurst, Plumas Lake, Loma Rica, Brownsville, Camptonville, Dobbins, Challenge, and Strawberry Valley. Practical permitting frictions: levee-dependent floodplain occupying the bulk of the western county (Linda / Olivehurst, Plumas Lake, the Feather River bottom and Yuba River bottom); FEMA SFHA along the Feather River, Yuba River, Bear River, and Honcut Creek; SB 5 / SB 1278 200-year flood-protection findings applicable to new urban-level development; the Three Rivers Levee Improvement Authority (TRLIA) governing levee improvements along the Feather / Yuba / Bear Rivers; Beale Air Force Base AICUZ overlay covering a corridor surrounding the runway and approach paths in the central county; CAL FIRE State Responsibility Area in the Sierra foothills (Very High FHSZ across Loma Rica, Brownsville, Dobbins, Challenge, Camptonville); the 2017 Cascade Fire footprint affecting parts of the Sierra-foothill belt; the Tahoe National Forest in the easternmost county; the Yuba River Wild and Scenic corridor (the Middle Fork and South Fork Yuba are designated state Wild and Scenic Rivers); Williamson Act parcels covering substantial agricultural Yuba; the Yuba County Water Agency (managing the Yuba River hydropower / water-supply system, including Englebright Dam and New Bullards Bar Reservoir); rural well-water / septic on essentially all unincorporated lots outside the urban core; and SACOG / RHNA 6th-cycle housing allocations.

Process overview: Standard ministerial 60-day review per Sec. 65852.2(b) for compliant ADU applications on parcels outside special overlays. Within FEMA SFHA, ADUs must elevate finished floor to or above base flood elevation; basement and below-grade space is heavily restricted. SB 5 / SB 1278 200-year flood-protection findings apply to new urban-level development; the binding constraint is most acute on Linda / Olivehurst / Plumas Lake new urban subdivisions but ADU additions to existing dwellings are generally exempted. Within Beale AFB AICUZ, applications are routed for inter-jurisdictional consultation and may require noise-attenuation construction in AICUZ Zones II-III; Clear Zone (AICUZ I) and APZ I prohibit new residential construction. Within Very High FHSZ in the Sierra foothills (Loma Rica, Brownsville, Dobbins, Challenge, Camptonville), Chapter 7A ignition-resistant construction, PRC 4291 defensible space, and CAL FIRE driveway/turnaround review apply. AB 38 home-hardening provisions apply to post-fire rebuilds in declared disaster areas (2017 Cascade Fire). Within Yuba River Wild and Scenic corridor, riparian-zone construction faces additional review beyond county zoning. Septic-suitability evaluation by Yuba County Environmental Health is required on essentially all unincorporated parcels outside the urban core; high groundwater table in the floodplain creates septic limitations.

Impact fees: SB 13 fee waivers apply to ADUs under 750 sqft (no impact fees). For ADUs 750+ sqft, county impact fees are calculated proportionally to existing primary dwelling. CAL FIRE driveway/defensible-space inspection fees apply on SRA parcels in the Sierra foothills. Septic permits required (typically $1,500-$4,500 depending on system type). School-district fees per Education Code Sec. 17620 on ADUs over 500 sqft (Marysville JUSD, Plumas Lake ESD, Wheatland USD, Wheatland UHSD, Camptonville USD, Dobbins ESD, Loma Rica USD by sub-area). Levee-district / TRLIA assessments may apply on parcels within Reclamation District boundaries. Beale AFB AICUZ noise-attenuation construction adds ~5-15% to construction cost in Zones II-III.

The Yuba County Assessor maintains parcel-level assessment records for the entire county. ADU additions on unincorporated parcels are captured as improvements via shared permit data with Community Development. California Proposition 13 caps base-year valuation increases at 2 percent per year on the existing structure; new improvement value (the ADU) is added as a separate line item assessed at fair market value at completion. The county's parcel-lookup portal supports public access to assessment records and tax bills. Williamson Act / Land Conservation Act parcels covering substantial agricultural Yuba (the Wheatland / Bear River agricultural belt, the Loma Rica / Brownsville foothill ranching belt) carry agricultural use-value assessment under Sec. 423 of the Revenue and Taxation Code. Beale AFB and other federal lands are assessment-exempt; this is meaningful for total-county assessed valuation. Plumas Lake CFD / Mello-Roos overlays push effective tax rates to 1.5-1.7 percent in some Plumas Lake subdivisions.

Assessment policy: ADU improvement value is added on the next regular revaluation cycle following completion. Per Prop 13, the ADU's value is taxed at 1 percent of fair market value at completion (plus voter-approved local rates including levee-district assessments and Plumas Lake CFD / Mello-Roos overlays that can push effective rates to 1.5-1.7 percent). Conversion ADUs (within existing structure) typically generate smaller incremental assessments than detached new construction. Williamson Act parcels: ADU addition compatible with continuing agricultural use does not trigger non-renewal; non-compatible additions trigger 9-year non-renewal phase-out. Post-disaster Prop 50 / Prop 19 base-year-value transfer is available for parcels with structures destroyed in declared disasters (2017 Cascade Fire footprint).

Yuba County overlays of consequence: (1) levee-dependent FEMA SFHA along the Feather River, Yuba River, Bear River, and Honcut Creek; (2) SB 5 / SB 1278 200-year flood-protection requirements; (3) the Three Rivers Levee Improvement Authority (TRLIA) governance; (4) Beale Air Force Base AICUZ overlay; (5) CAL FIRE SRA Very High FHSZ in the Sierra foothills; (6) the 2017 Cascade Fire footprint; (7) the Yuba River Wild and Scenic corridor (Middle Fork / South Fork); (8) Tahoe National Forest in the easternmost county; (9) Williamson Act ag-preserves; and (10) SACOG / RHNA 6th-cycle housing allocations.

• FEMA SFHA - Feather River, Yuba River, Bear River, Honcut Creek
• SB 5 / SB 1278 200-Year Flood Protection Requirements
• Three Rivers Levee Improvement Authority (TRLIA)
• Beale Air Force Base Air Installation Compatible Use Zone (AICUZ)
• CAL FIRE State Responsibility Area / Yuba Sierra-foothill Very High FHSZ - 2017 Cascade Fire
• Post-2017 Cascade Fire / 2020 North Complex peripheral recovery zone
• Yuba River Wild and Scenic corridor (Middle Fork / South Fork)
• Tahoe National Forest in eastern Yuba County
• Williamson Act / Land Conservation Act agricultural preserves
• Maidu / Konkow / Nisenan ancestral territory tribal consultation