California · Off-grid & homestead potential
Contra Costa County scores 25/100 on the Bolthole Index, a weak county profile. The trade-offs: about 599,339 people within a 30-minute drive and elevated mid-century heat, water, rain, or wildfire exposure.
Found land here? Start a Property Hunt →County locator
Evidence strength: 99%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →
Scout Contra Costa County
Camp here before you commitBook a few nights nearby on Hipcamp →Already own land here?Earn money hosting campers — get $100 when you become a Hipcamp host →Some links are affiliate or referral links — we may earn a commission, at no cost to you.
Property hunt
Search live inventory elsewhere, then cost and vet each candidate here. No copied listings, account, or paid data feed.
Each button opens a current land search for Contra Costa County. Listing sites control their own results and filters.
Use rough quotes or placeholders. Blank fields count as $0.
Working estimate
A planning estimate, not a valuation or contractor quote. The USDA benchmark includes farm land and buildings; it is context, not a parcel comp.
Before an offer
Saved properties and checklist progress stay on this device. Bolthole Index does not receive them.
What it takes to build here — permits, zoning, and septic — scouted from Contra Costa County’s own official sources.
Contra Costa County requires a building permit whenever structural, plumbing, mechanical, or electrical work is performed; almost all projects in the unincorporated county require permits under the adopted California Building Standards Code.
Contra Costa County - Applying for a Building or Grading Permit ↗The Contra Costa County Department of Conservation & Development is the County Planning Agency and administers zoning/land use regulations for the unincorporated county.
Contra Costa County - Building & Planning ↗Contra Costa Environmental Health's Land Use Program issues construction permits for onsite wastewater treatment (septic) systems, including site/soil evaluation and design review.
Contra Costa Health - Land Use Program ↗Contra Costa County allows a property owner to obtain a building permit for their own project via the permit forms, reflecting the California B&P 7044 owner-builder exemption.
Contra Costa County - Permit List and Forms ↗Not published on an official source — confirm with the county.
Not published on an official source — confirm with the county.
Not published on an official source — confirm with the county.
Not published on an official source — confirm with the county.
Not published on an official source — confirm with the county.
Always confirm current rules with Contra Costa County Department of Conservation & Development (Building Inspection Division) before you buy or build. Scouted Jul 2026 from official county sources.
Whether a new home can legally get its own water here — the sub-state groundwater regime, from California’s water agency.
This basin is under active state management — new water use is scrutinized, though a domestic well is usually still allowed.
California requires no STATE permit for a domestic well — wells are permitted by the county — but under SGMA a Groundwater Sustainability Agency can meter or restrict new wells in medium/high-priority and critically overdrafted basins, and Executive Order N-7-22 requires counties in those basins to get GSA verification that a new well is consistent with the Groundwater Sustainability Plan before permitting.
Limit: 2 acre-feet/year de minimis under SGMA (Water Code §10721(e)) — largely exempt from GSA metering/fees
California DWR / State Water Board — SGMA de minimis & EO N-7-22 Action 9 FAQ ↗Medium-priority SGMA basin (DWR 2019 Basin Prioritization) requiring an adopted Groundwater Sustainability Plan; a new well is subject to GSA consistency review under Executive Order N-7-22. De minimis domestic wells (<2 af/yr) are generally exempt from GSA metering but still need a county permit.
California DWR — SGMA Basin Prioritization (2019) ↗Hybrid state (appropriation + riparian). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the California state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.
Contra Costa County scores 25/100 on the Bolthole Index, a weak county profile. Watch-outs: about 599,339 people within a 30-minute drive and elevated mid-century heat, water, rain, or wildfire exposure.
Contra Costa County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Contra Costa Health - Environmental Health Division (Land Use Program). Owner-builders may act as their own contractor to build their home. Rules change and cities within the county differ — always confirm with the county before you buy or build.
Land in Contra Costa County runs about $9,199 per acre, based on the latest county data.
Contra Costa County gets about 19.3" of rain a year, with severe drought in roughly 40.4% of years. On water rights, Contra Costa County lies in the East Contra Costa Subbasin — Medium Priority — Medium-priority SGMA basin (DWR 2019 Basin Prioritization) requiring an adopted Groundwater Sustainability Plan; a new well is subject to GSA consistency review under Executive Order N-7-22. De minimis domestic wells (<2 af/yr) are generally exempt from GSA metering but still need a county permit..
A representative private-land location has about 599,339 people within a 30-minute drive and 12,666,427 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.
Off-grid gear
Going off-grid in Contra Costa County means bringing your own water and power. The kit we’d start with:
These are affiliate links — we may earn a commission, at no cost to you.
