Contra Costa County · census-designated place

Bethel Island

Bethel Island is a census-designated place in unincorporated Contra Costa County, in the San Francisco Bay Area. 5.25 sq mi of land. Zoning is set by the county, not a city government. Screen any APN in or near Bethel Island for zoning, FEMA flood, CAL FIRE / WUI wildfire hazard, soils, geology, and planning — every finding linked to the official source — then verify with Contra Costa County planning before you buy or entitle.

Updated 2026-08-29

Useful sources for searching Bethel Island: Official sources to verify buildability in Bethel Island ↓

About Bethel Island land diligence

Bethel Island is a census-designated place in unincorporated Contra Costa County, in the San Francisco Bay Area. 5.25 sq mi of land. Zoning is set by the county, not a city government.

Bethel Island is a census-designated place in unincorporated Contra Costa County—confirm zoning with the county. Most deals need both a fast multi-layer screen and a follow-up with local planners—especially where city limits, specific plans, hillside fire standards, or floodplain rules apply.

Search intents this page answers: zoning in Bethel Island, FEMA flood near Bethel Island, CAL FIRE hazard severity, APN lookup, and whether a vacant lot is buildable before you spend on surveys or design.

Community snapshot

Bethel Island is a census-designated place in unincorporated Contra Costa County, California.

Character: Census-designated / unincorporated community in San Francisco Bay Area.

Land area: roughly 5.251 square miles.

Climate: Bay Area Mediterranean — cooler near the bay, hotter inland Diablo valleys.

Growth outlook: Population and housing capacity for Bethel Island should be confirmed with Census ACS and Contra Costa County planning for unincorporated land; do not rely on outdated marketing copy.

Jurisdiction check: confirm whether the APN is inside Bethel Island limits or unincorporated Contra Costa County before relying on city zoning maps alone.

Housing & land patterns

Median home

$683k

Median income

$75k

Ownership

64%

Median year built

1973

vs California

-10%

Terrain

Bay · Inland valleys (Concord · Diablo Range foothills

Bethel Island is a census-designated / unincorporated community in San Francisco Bay Area with housing prices below the California ACS median, household incomes below the state average, a owner-heavy housing mix, and housing stock primarily built during the mid- to late-20th century.

Housing market

Median home value

$683k

$682,700

Somewhat lower than CA

Median rent

$1,606/mo

Median household income

$75k

$74,972

Lower than CA

Vacancy rate

16.9%

California$760k
Bethel Island$683k

-10% vs California ACS median

Housing characteristics
Owner-occupied64%
Renter-occupied36%
1973
19202025

Typical home age signal — not a forecast of new construction.

Affordability & housing mix

Home value ÷ income

9.1×

ACS proxy — median home value divided by median household income

Rent ÷ income

26%

Annual median gross rent as share of median household income

Rent burden 30%+

23%

Share of renter households paying 30% or more of income on gross rent

Derived ACS ratios for market context — not a proprietary cost-of-living index or lender qualification standard.

Single-family units74%
Multifamily units4%
Mobile homes22%

Units-in-structure mix from ACS — shares of total housing units, not new construction pipeline.

Lifestyle & investment

Families

  • Income levels vary — confirm school and commute fit locally
  • Neighborhood amenities and lot hazards still decide fit
  • Confirm attendance boundaries on the specific APN

Retirees

  • Housing stock centered around 1973 — maintenance needs vary
  • Walkability and healthcare access differ street to street
  • Review HOA rules, insurance, and parcel hazards before buying

Investors

  • Owner-heavy markets still need local rental comps
  • ACS median gross rent about $1,606/mo
  • Zoning, ADU rules, and insurance drive outcomes more than ACS averages

Builders

  • Hillside homesites often need geotech, retaining walls, and fire-setback diligence
  • Verify zoning, setbacks, and utility access early
  • Geotechnical and grading reviews are common on hillside lots
Terrain & geography

Contra Costa County runs from bayshore flats through urban valleys into the Diablo Range and Mount Diablo massif. Topography is a major price and buildability splitter between flat suburbs and hillside estates.

Elevation Near sea level along Suisun/San Francisco Bay to 3,849 ft at Mount Diablo

01BayBay and Delta shoreline flats and marsh edges
02Inland valleys (ConcordInland valleys (Concord, Walnut Creek, San Ramon corridors)
03Diablo Range foothillsDiablo Range foothills and Mount Diablo slopes
04East County plains transitioningEast County plains transitioning toward the Delta
Development checklist
  • Slope and grading feasibility
  • Flood exposure and drainage
  • Wildfire / WUI hazard
  • Liquefaction and geology where mapped
  • Zoning, setbacks, and overlays
  • Utility access (water, sewer/septic, power)
  • Geotechnical conditions on hillside or fill lots

Screen slope and elevation on the APN in Parcel View, then confirm grading, driveway grades, and pad feasibility with Contra Costa County planning and a licensed surveyor/engineer.

Key takeaways

  • Use ACS medians as market context for Bethel Island, then verify current listings locally.
  • Terrain shifts across several landscapes — from bay to east county plains transitioning.
  • Parcel-specific screening for zoning, flood, wildfire, soils, and slope matters more than any countywide average.

What Parcel View checks in Bethel Island

Parcel & APN

Boundary and assessor parcel number context so you can confirm you are looking at the right lot inside or near Bethel Island.

Zoning & land use

Reference zoning and general plan overlays from public GIS—verify final district with Contra Costa County planning.

FEMA flood

National Flood Hazard Layer zones across the parcel, including Special Flood Hazard Areas that affect insurance and building rules around Bethel Island.

Wildfire hazard

CAL FIRE Fire Hazard Severity Zones and WUI context for insurance and defensible-space diligence around Bethel Island.

Soils

USDA SSURGO map units for a first look at septic suitability, drainage, and grading constraints where mapped near Bethel Island.

Geology & slope

Mapped liquefaction, fault, landslide, and terrain screens where the state publishes them for Contra Costa County.

Verify locally

Parcel View is a first-pass public GIS screen. City or county planning makes official determinations for Bethel Island.

Living and buying land in Bethel Island

Bethel Island is a census-designated place in unincorporated Contra Costa County, California.

Character: Census-designated / unincorporated community in San Francisco Bay Area.

Land area: roughly 5.251 square miles.

Climate: Bay Area Mediterranean — cooler near the bay, hotter inland Diablo valleys.

Growth outlook: Population and housing capacity for Bethel Island should be confirmed with Census ACS and Contra Costa County planning for unincorporated land; do not rely on outdated marketing copy.

Jurisdiction check: confirm whether the APN is inside Bethel Island limits or unincorporated Contra Costa County before relying on city zoning maps alone.

Wildfire, flood, and insurance diligence in Bethel Island

Hazard diligence is parcel-specific in Bethel Island, but community patterns matter for underwriting and timeline.

Wildfire: community screening level is elevated — Hillside and Diablo Range edges often carry elevated wildfire screening notes..

Community wildfire screening note: elevated — Hillside and Diablo Range edges often carry elevated wildfire screening notes.

Flood: community screening level is variable — Flood risk varies by floodplain, alluvial fan, and local drainage. Screen FEMA layers on the APN and ask about drainage history..

Community flood screening note: variable — Flood risk varies by floodplain, alluvial fan, and local drainage. Screen FEMA layers on the APN and ask about drainage history.

Seismic: California is seismically active. Review Alquist-Priolo / fault maps and local geologic hazards for the APN..

Coastal influence may add Local Coastal Program, tsunami, or coastal setback questions on some lots.

Insurance diligence often focuses on: wildfire / wui underwriting; brush clearance and defensible space documentation; flood zone determination where fema indicates risk.

FAIR Plan / insurance context: Homeowners insurance can be constrained by wildfire, brush, and sometimes flood. FAIR Plan appears more often in higher wildfire zones — verify early in diligence.

Commute, transit, and utilities in Bethel Island

Commute screen: Commute times from Bethel Island depend on destination, highway access, and time of day. Map drive times for your destinations rather than relying on a single city average..

Walkability: Walkability is usually higher near downtown or village centers and lower on rural/edge lots. Visit the block and check sidewalks, grade, and services..

Bike network: Bike infrastructure varies by corridor. Check local bike plans and ride the actual route you would use.

Downtown / village center: Bethel Island is unincorporated / CDP — commercial and service centers may be nearby towns rather than a classic city downtown.

Visit the parcel at the hours you would actually commute — last-mile access varies street-by-street.

Sewer vs septic: Sewer vs septic is parcel-specific in Bethel Island. Confirm connection, capacity, and any septic permits with the local sanitation / environmental health desk..

Wells: Private wells appear more often on rural and edge lots. Confirm well yield, water quality, and any shared-system agreements during diligence.

Natural gas: Natural gas availability varies by street — confirm with the serving utility..

Electric/gas utility context is typically PG&E territory in this part of Contra Costa County — confirm the serving utility on the meter.

Bethel Island subareas and lot patterns

Bethel Island is often searched as a single community name on listings and county maps.

Even without a long published neighborhood list, lot-level zoning, hazards, utilities, and school boundaries still vary.

When comparing two lots in Bethel Island, weight WUI/fire, FEMA flood, septic vs sewer, slope/access, and easements carefully.

Lifestyle context for Bethel Island

Bethel Island dining and services cluster near commercial corridors and nearby centers; rural lots may be a drive from groceries and cafes.

Separate lifestyle preferences from lot-level buildability — a great street can still fail on fire insurance, flood zone, slope, or septic capacity.

Pets: Generally pet-friendly at the community level; always confirm HOA, rental, and local animal ordinances for the specific property.

How to screen a parcel in Bethel Island

Enter the address or APN on Screen and confirm jurisdiction (Contra Costa County planning (unincorporated) vs Contra Costa County).

Review zoning, FEMA flood, CAL FIRE / WUI, soils, geology, and slope/elevation overlays.

SB 9 screen: SB 9 applicability in unincorporated areas depends on county implementation — confirm with county planning..

HOAs: HOAs are common in planned developments and some condo/townhome tracts — request CC&Rs early if the listing mentions an association.

Short-term rentals: Short-term rental rules vary by city and county and often require permits. Verify with code enforcement / planning before assuming Airbnb/VRBO use.

General Plan focus often includes: Confirm land-use designations and Housing Element sites with Contra Costa County planning..

Land area
5.251 sq mi
Character
Census-designated / unincorporated community in San Francisco Bay Area
Median home value (ACS)
$682,700 (about 10% below the California statewide ACS median) · ACS 2020-2024
Median gross rent (ACS)
$1,606/mo · ACS 2020-2024
Median household income (ACS)
$74,972 · ACS 2020-2024
Homeownership (ACS)
64% owner-occupied
Housing stock age
About 1973
Market context
Median home $682,700 (about 10% below the California statewide ACS median); vacancy about 16.9% · ACS 2020-2024 context
County elevation range
Near sea level along Suisun/San Francisco Bay to 3,849 ft at Mount Diablo
Fire risk (community)
elevated — Hillside and Diablo Range edges often carry elevated wildfire screening notes.
Flood risk (community)
variable — Flood risk varies by floodplain, alluvial fan, and local drainage. Screen FEMA layers on the APN and ask about drainage history.
Sewer / septic
Public sewer vs septic varies by neighborhood and edge lots — confirm with local sanitation / environmental health.
ADU screening
California statewide ADU law is strong; confirm local ordinance standards, setbacks, and parcel hazards with planning before design.
Downtown
Walkability depends on nearby service centers; many CDP lots are auto-oriented.
Region
San Francisco Bay Area

Common Bethel Island buyer questions

Short screening answers for searches buyers actually type. These are community-level notes — confirm on the parcel and with Contra Costa County planning.

Is this area expensive?

Median owner-occupied home value is about $682,700 (about 10% below the California statewide ACS median); median gross rent about $1,606/mo. Neighborhoods vary — confirm current listings with a local agent.

Is it a buyer's market?

Median home $682,700 (about 10% below the California statewide ACS median); vacancy about 16.9% · ACS 2020-2024 context

Is it growing?

Population and housing capacity for Bethel Island should be confirmed with Census ACS and Contra Costa County planning for unincorporated land; do not rely on outdated marketing copy.

Is it family friendly?

High household incomes (about $74,972) suggest a relatively affluent community, but school quality, commute, parks, and parcel hazards still decide family fit. Confirm attendance boundaries and screen fire/flood on the APN.

Is it good for retirees?

Housing built around 1973 means maintenance needs vary. Walkability, healthcare access, HOA rules, and insurance costs should be reviewed before purchasing.

Is it good for investors?

Tenure mix is about 64% owner-occupied. Median gross rent about $1,606/mo. Rental demand may help, but zoning, ADU rules, STR ordinances, and insurance ultimately determine investment potential.

Are rentals in demand?

Median gross rent is about $1,606/mo. Confirm vacancy, comps, and any rent-stabilization or STR rules before underwriting.

Is there new construction?

Typical stock ages to around 1973; newer tracts and Housing Element sites still need local planning maps. Check current applications with Contra Costa County planning for unincorporated land.

Can I build an ADU?

California statewide ADU law is strong; confirm local ordinance standards, setbacks, and parcel hazards with planning before design.

Is it wildfire prone?

Community wildfire screening note: elevated — Hillside and Diablo Range edges often carry elevated wildfire screening notes.

Is flooding common?

Community flood screening note: variable — Flood risk varies by floodplain, alluvial fan, and local drainage. Screen FEMA layers on the APN and ask about drainage history.

Is there public sewer?

Sewer vs septic is parcel-specific in Bethel Island. Confirm connection, capacity, and any septic permits with the local sanitation / environmental health desk.

Are wells common?

Private wells appear more often on rural and edge lots. Confirm well yield, water quality, and any shared-system agreements during diligence.

Are HOAs common?

HOAs are common in planned developments and some condo/townhome tracts — request CC&Rs early if the listing mentions an association.

Are short-term rentals allowed?

Short-term rental rules vary by city and county and often require permits. Verify with code enforcement / planning before assuming Airbnb/VRBO use.

What is the average commute?

Commute times from Bethel Island depend on destination, highway access, and time of day. Map drive times for your destinations rather than relying on a single city average.

Is it walkable?

Walkability is usually higher near downtown or village centers and lower on rural/edge lots. Visit the block and check sidewalks, grade, and services.

Is it bike friendly?

Bike infrastructure varies by corridor. Check local bike plans and ride the actual route you would use.

Does it have a downtown?

Bethel Island is unincorporated / CDP — commercial and service centers may be nearby towns rather than a classic city downtown.

Is it pet friendly?

Generally pet-friendly at the community level; always confirm HOA, rental, and local animal ordinances for the specific property.

Screen a parcel in Bethel Island Contra Costa County guide

Profile confidence: medium · Updated 2026-08-05. Informational screening only.

Frequently asked questions about Bethel Island parcels

Is land in Bethel Island buildable?

Buildability is not a single map label. Screen zoning, flood, wildfire hazard, access, and soils for the specific APN near Bethel Island, then ask Contra Costa County planning whether your proposed use can be entitled and permitted.

How do I check zoning in Bethel Island?

Run a Parcel View screen for a first-pass zoning/general-plan reference, then confirm the controlling district with Contra Costa County planning. Overlays and specific plans can change what is allowed.

Does Bethel Island have FEMA flood risk?

Flood risk is parcel-specific. Parcel View intersects the FEMA National Flood Hazard Layer with the lot polygon. Always verify Special Flood Hazard Areas and base flood elevations on the FEMA Map Service Center before financing or building.

How do I screen a parcel in Bethel Island?

Enter the address or APN in Parcel View. Bethel Island is a census-designated place in unincorporated Contra Costa County—confirm zoning with the county.

Is Parcel View a substitute for Contra Costa County planning?

No. It is a first-pass public GIS screen with source links. City or county planning makes official determinations.

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