Unincorporated Sacramento County, CA Real Estate & Homes for Sale

Where unincorporated Sacramento County is and who governs it

"Unincorporated" means outside the seven incorporated cities. Sacramento County Water Resources lists those cities as Citrus Heights, Elk Grove, Folsom, Galt, Isleton, Rancho Cordova and Sacramento, and it handles flood questions only for parcels outside them (county flood zone page). Everywhere else, the Sacramento County Board of Supervisors and county departments handle zoning, building permits and code enforcement.

County land use rules come in layers. The county’s Land Use Regulation Library holds:

• the Zoning Code and General Plan
• community plans for Antelope, Arden Arcade, Carmichael, Cordova, the Delta, Fair Oaks, Florin Vineyard, North Highlands, Rio Linda and Elverta, the Southeast Area, South Sacramento and Vineyard
• special planning areas, neighborhood preservation areas and specific plans

For example, the Fair Oaks Village NPA sets its own lot coverage and height limits, and the Mather Field SPA requires avigation easements for homes. To see which layers apply to a parcel, use the county’s General Map.

Water, sewer and utilities in unincorporated Sacramento County

Water is fragmented. The county’s Find My Water Company page says there are more than 20 water purveyors in the county. They include public districts (Fair Oaks, Carmichael, Rio Linda Elverta, Sacramento Suburban, Rancho Murieta CSD, the Sacramento County Water Agency) and investor-owned companies such as California American Water and Golden State Water. Its parcel lookup shows each address’s service districts.

Confirm the current collection and treatment agency with SacSewer and the actual account. Historical service reviews described non-contiguous urban and Delta service areas, but boundaries, consolidations and treatment routing can change. For an onsite system, obtain current EMD permits and capacity records rather than inferring service from a community name.

Septic and wells outside the sewer area fall under the county Environmental Management Department’s onsite wastewater program (LAMP):

Homes, lots and land use

County ADU standards apply in single-family, multifamily, commercial and mixed-use zones:

• Pathway and configuration: Current state and local rules distinguish conversions, JADUs, new detached units and existing/proposed multifamily buildings. Unit count, size, setbacks, parking and review periods depend on the qualifying pathway; a summary table is not a universal entitlement.
• Agricultural zones: the guide lists ADUs as not allowed under these standards in Agricultural-Residential (AR) and Agricultural (AG) zones, which covers many rural parcels. The County directs readers to Agricultural Accessory Dwellings (§3.9.3.C) and Farmworker Housing (§3.5.2.C); some AR parcels in urban census tracts may have SB 9 options.

Farmland may also be under a Williamson Act contract. The Assessor’s FAQ explains that a contract binds later owners, and that restricted land is valued on an income basis while homesites stay under Proposition 13.

Hazards and insurance to check

• Flood: For any unincorporated parcel, the county offers an online map, an inquiry form (where you can ask whether an elevation certificate is on file), a public counter at 827 7th Street, Room 102, and the Flood Zone Hotline at (916) 874-7517. FEMA’s official maps are at the Flood Map Service Center. The county holds a Class 2 rating in FEMA’s Community Rating System, which discounts most NFIP policies in unincorporated areas by 40% for policies issued or renewed on or after October 1, 2026.
• Wildfire: Use the OSFM Fire Hazard Severity Zone maps. State Responsibility Area maps took effect April 1, 2024, and local-area maps were released to jurisdictions in early 2025. Rural districts such as Herald include substantial SRA land, according to LAFCo.
• Ground failure: EQ Zapp shows mapped liquefaction, landslide and fault zones.

Local rules buyers and owners should know

The county’s short-term rental rules:

• Permits: a permit, a business license and 12% Transient Occupancy Tax registration, applied for through one online application.
• Residency: the operator must live on-site at least six months a year.
• Stay limits: rentals are limited to 29 total days per rental party per calendar year, with one rental party at a time and two adults per bedroom.
• ADUs and JADUs: an ADU may qualify only if it was constructed before January 1, 2020 and satisfies the applicable program requirements; JADUs and guest houses never qualify.
• Delta exception: a short-term rental can be the primary use of a property only in qualifying zones of the Locke and Courtland SPAs and the Walnut Grove NPA.

For tax bills and assessments, see our Sacramento County property tax guide. Community pages: Fair Oaks, Rio Linda, Antelope, Wilton and Herald real estate. Also see where to live in Sacramento County.

Unincorporated Sacramento County real estate: questions people ask

How do I know if a Sacramento-area address is unincorporated?

A mailing city doesn’t settle it. Look up the parcel on the county’s General Map. If it’s outside Citrus Heights, Elk Grove, Folsom, Galt, Isleton, Rancho Cordova and Sacramento, the county handles zoning, building permits and unincorporated flood zone questions.

Who provides water to an unincorporated home?

It could be one of more than 20 purveyors, including public water districts, the Sacramento County Water Agency or private companies, or a private well. Use the county’s Find My Water Company lookup, then ask the seller for bills or well records.

Can I run a short-term rental in unincorporated Sacramento County?

Only with a county permit, a business license and TOT registration, and only if you live on the property at least six months a year. Rentals are limited to 29 total days per rental party per calendar year. ADUs constructed on or after January 1, 2020, and all JADUs, can’t be used.

Does the county’s flood insurance discount apply to me?

The county’s Class 2 CRS rating gives a 40% discount on most NFIP policies in unincorporated areas issued or renewed on or after October 1, 2026. If you live in a city, ask that city about its own flood programs. An insurance agent can confirm how a discount applies to a specific policy.

Sources for this section

1. Sacramento County Water Resources, flood zone information — https://waterresources.saccounty.gov/us/en/stormready/flood-zone-information.html
2. Sacramento County Land Use Regulation Library (community plan index) — https://landuse.saccounty.gov/cp/vineyard/
3. Sacramento County, Fair Oaks Village NPA — https://landuse.saccounty.gov/npa/537-020/
4. Sacramento County, Mather Field SPA — https://landuse.saccounty.gov/spa/603-010/
5. Sacramento County Water Resources, Find My Water Company — https://waterresources.saccounty.gov/us/en/water-agency/find-my-water-company.html
6. Current official source / program records: https://www.sacsewer.com/
7. Current official source / program records: https://emd.saccounty.gov/content/dam/emd/docs/archive2/LAMP%20COMBINED%20DOC%20v.2%20-%2011.29.17%20revision.pdf
8. Sacramento County ADU/JADU development standards — https://landuse.saccounty.gov/szc/userguide_apdxa/
9. Sacramento County Assessor, Williamson Act FAQs — https://assessor.saccounty.gov/content/assessor/us/en/topics-a-to-z/williamson-land-conservation-act/faqs.html
10. Sacramento County, Class 2 CRS rating — https://www.saccounty.gov/us/en/articles/2025-articles/sacramento-county-maintains-important-fema-rating.html
11. FEMA Flood Map Service Center — https://msc.fema.gov/portal/home
12. CAL FIRE/OSFM, Fire Hazard Severity Zones — https://osfm.fire.ca.gov/what-we-do/community-wildfire-preparedness-and-mitigation/fire-hazard-severity-zones
13. Current official source / program records: https://www.heraldfire.com/
14. California Geological Survey, EQ Zapp — https://www.conservation.ca.gov/cgs/geohazards/eq-zapp
15. Current official source / program records: https://planning.saccounty.gov/us/en/planning-environmental-review/applicants/strp.html?ID=1547