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Sonoma County, CA Rental Property Rules: Just Cause Eviction (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Just cause eviction rules in Sonoma County, CA, sometimes called tenant protection or "for cause" eviction ordinances, list the specific legal reasons a landlord can end a tenancy.

Key Facts

Local Ordinance
Ord. 6496. Residential Tenancy Protections
Effective Date
September 17, 2024
Scope
Unincorporated Sonoma County only
Just-Cause Trigger
Day one (vs. AB 1482's 12 mo.)
Nonpayment Floor
Past-due rent > 30 days; max 2x per year
No-Fault Relocation
Greater of actual rent or HUD Fair Market Rent
Notice Duty
All landlords. English + Spanish info within 3 days

Summary

On September 17, 2024, the Sonoma County Board of Supervisors adopted Ordinance No. 6496, the Residential Tenancy Protections Ordinance, which applies to rental units in unincorporated Sonoma County. The ordinance augments the statewide California Tenant Protection Act (AB 1482, Cal. Civ. Code § 1946.2) by extending just-cause protections from day one of any covered tenancy, expanding coverage to income-restricted housing, narrowing the rent-nonpayment trigger, and increasing no-fault relocation payments.

City-specific rules exist: Petaluma has its own just cause eviction rules that differ from Sonoma County's county-level regulations. If you live in Petaluma, check the city-specific page instead.

(2) If an owner issues a notice to terminate a tenancy for no-fault just cause, the owner shall notify the tenant in the written termination notice of the tenant’s right to relocation assistance or rent waiver pursuant to this section. If the owner elects to waive the rent for the final month of the tenancy as provided in subparagraph (B) of paragraph (1), the notice shall state the amount of rent waived and that no rent is due for the final month of the tenancy.

Full Breakdown

Ord. 6496 builds on AB 1482 rather than replacing it. Key local enhancements: (1) Just-cause protections apply from day one of any covered tenancy (state law normally requires 12 months of occupancy or 24 months for some adult co-tenants). (2) Coverage is extended to tenants in income-restricted (deed-restricted affordable) properties, which AB 1482 generally exempts. (3) An eviction for nonpayment of rent may only be initiated where the past-due rent exceeds 30 days of rent, and this trigger may be invoked no more than twice per calendar year.

(4) Relocation payments for no-fault evictions must be the greater of actual rent or Fair Market Rent (HUD FMR), exceeding AB 1482's one-month-of-rent floor. (5) ALL landlords in unincorporated Sonoma County, whether covered by just cause or not, must provide tenants with prescribed termination information in English and Spanish within 3 days of giving notice. (6) The Board of Supervisors may invoke additional countywide eviction protections during a declared state of emergency.

Violations & Fines

Under Cal. Civ. Code § 1946.2(g), failure to comply with just-cause requirements renders a termination notice void and creates an affirmative defense in any unlawful detainer. Ord. 6496's added local notice and relocation duties carry the same defensive consequence, plus exposure to civil liability for actual damages and, where bad faith is shown, treble damages and attorney's fees. Enforcement is administered by the County Administrator's Office; tenants may also pursue private claims.

Frequently Asked Questions

Does Sonoma County require just cause for eviction from day one of a tenancy?
Yes: in the unincorporated area. Ord. 6496 (adopted Sept. 17, 2024) extends California's just-cause framework so that protections apply from day one of any covered tenancy, eliminating AB 1482's 12-month threshold. State law still applies inside incorporated cities.
How much rent must a tenant be behind before a Sonoma County landlord can evict for nonpayment?
The past-due rent must exceed 30 days of rent before a nonpayment eviction can be initiated under Ord. 6496, and a landlord may not invoke that trigger more than twice in the same calendar year. This is stricter than AB 1482, which has no calendar-year limit.
What relocation assistance does Sonoma County require for a no-fault eviction?
Ord. 6496 requires the greater of the tenant's actual rent or the HUD Fair Market Rent for the unit's size and region. That's typically higher than AB 1482's one-month-of-rent baseline (Cal. Civ. Code § 1946.2(d)), especially for tenants in long-held, below-market units.

Sources & Official References

Other rules in Sonoma County

All Sonoma County rules

California rules heatmap·Compare Sonoma County to another location·View the California rental property rules overview

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Just Cause Eviction in Cities Across Sonoma County