Lake County Land for Sale

By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.

Land for sale in Lake County includes small lots in lakeside communities around Clear Lake, rural residential acreage, and larger agricultural and rural lands parcels in the hills and valleys. On most parcels without sewer, the first question is whether the county will approve a septic system. You can’t apply for a septic permit on new development until Lake County Environmental Health has done a site evaluation. Zoning density, Fire Safe access and, on the shoreline, lakebed permits come next.

At a glance

Where to look in Lake County

Lake County’s land listings tend to sort by setting:

• Lakeshore communities. Lots in and around Lakeport real estate, Lucerne real estate, Clearlake Oaks real estate and Clearlake real estate are smaller, and some sit on or near the shoreline. Lakeport and Clearlake are incorporated cities with their own planning departments; the other communities are unincorporated. See our lakeshore, town and rural property comparison.
• Valleys and farm country. Around Kelseyville real estate, Upper Lake real estate and Lower Lake real estate you’ll find rural residential acreage and agricultural parcels. If you’re looking at grapes or orchards, start with Lake County vineyards.
• South County and the mountain areas. Middletown real estate, Hidden Valley Lake real estate and Cobb real estate include subdivision lots and rural parcels. In planned communities, ask who provides water and sewer and whether an association has its own building rules. In wooded areas, fire safe access and rebuild history matter; see Lake County wildfire, insurance and rebuild records.

For the county’s towns and housing types more broadly, see the Lake County where-to-live guide, and to compare carrying costs by setting, our homeownership budget by setting.

What to check before you buy

Septic site evaluation

Where there’s no sewer, Lake County requires a site evaluation before anyone can apply for a septic permit. An Environmental Health representative performs it, and the result depends on effective soil depth, lot size and depth to groundwater. Slope, streams, wells, cuts and easements can also limit a site, and the parcel needs room for both an initial and a replacement system. The report includes a site sketch, soil profile descriptions from test pits and a letter approving or denying the site, with the type and size of system and any special conditions. The guide also notes that naturally occurring asbestos may be present in parts of the county and gives precautions for digging test pits (Septic Site Evaluation Guide).

For a buyer, that means a vacant lot without an approval letter is unproven. Make the site evaluation a contingency, or ask the seller whether one has already been done. The county’s Land Development page links the On-Site Sewage Disposal rule book, minimum separation distances and a property inquiry form. Our Lake County water, sewer and septic service records guide covers what to request.

Wells and water service

The same Environmental Health program permits and inspects domestic, public and monitoring wells under Chapter 9 of the County Code and offers help with pump tests and well deepening (Lake County Land Development). Some lots are served by a water district or company instead. Ask which, get a will-serve letter if the lot is in a service area, and if you’ll need a well, budget for drilling with no promise of yield.

Zoning and density

The county Planning Division’s zoning guide describes the base districts. A and APZ (Agriculture and Agricultural Preserve) have a minimum lot size of typically 40 acres, and APZ land is under a Williamson Act contract, where land divisions are discouraged. RL (Rural Lands) allows one dwelling per 20 to 65 acres, RR (Rural Residential) one per 5 to 20 acres, and SR (Suburban Reserve) lots range from 40,000 square feet to 5 acres. A "B" combining district can set a different minimum lot size (A Guide to Zoning Districts). That guide dates from 2006, so confirm a parcel’s current zoning and standards with Planning and in the County Code before you rely on a density figure.

Williamson Act

The Department of Conservation says a Williamson Act contract is binding on all later purchasers and renews every year unless nonrenewed; cancelling a standard contract costs 12.5% of current fair market value (DOC Williamson Act FAQ). If a parcel is zoned APZ, read the recorded contract before you plan a house or a split. More in our Williamson Act guide.

Fire Safe roads, driveways and water

The State Minimum Fire Safe Regulations (14 CCR 1270 et seq.) apply to new residential, commercial and industrial buildings in the State Responsibility Area approved after January 1, 1991, and in Very High Fire Hazard Severity Zones approved after July 1, 2021. They also cover new parcels, use permits and new roads, and building permits on older parcels where access conditions were never set (14 CCR 1270.03). On a hillside lot, the road and driveway can drive your costs. See fire hazard severity zones in the North Bay.

Shoreline lots on Clear Lake

Waterfront land comes with a second set of permits. Under the Clear Lake Shoreline Ordinance (Chapter 23), piers, floats, boat lifts, docks and other work lakeward of the High Water Mark need a Lakebed Administrative Encroachment permit before a building permit. Structures lakeward of the Low Water Mark also need an encroachment lease with an annual payment. All structures must be set back 10 feet from adjacent property lines, the county may ask for a boundary determination map, and controlling aquatic plants needs its own permit (Shoreline Construction Requirements). If an existing dock is part of the appeal, ask the seller for its permit and lease. Our shoreline, dock and lakebed permits guide goes further.

Road access and shared roads

Many rural lots are reached by private roads. Under Civil Code 845, easement owners must keep a private right-of-way in repair and, absent a written agreement, share costs in proportion to use (text via california.public.law). Check the preliminary title report for recorded access, and see our guide to private road maintenance agreements in California.

How we approach a land purchase

1. Confirm whether the parcel is in Lakeport, Clearlake or the unincorporated county, and read the current zoning.
2. Ask for any existing septic site evaluation letter, well log or water will-serve letter.
3. Make septic evaluation, water and access review contingencies.
4. For shoreline lots, check lakebed permits and leases for existing structures.

Our guide to buying land in California walks through each step, and our buyer services page explains how we represent buyers.

Questions people ask

Do I need a septic site evaluation before I buy land in Lake County?

It’s not required to buy, but you can’t apply for a septic permit on new development without a site evaluation approval letter. Making it a contingency protects you.

Who does the septic site evaluation?

A representative of Lake County Environmental Health performs it after you apply, pay the fee and prepare the site.

How many homes can I build on Rural Lands (RL) land?

The county’s zoning guide describes RL density as one dwelling per 20 to 65 acres. Confirm the current figure for a specific parcel with Planning.

What is APZ zoning?

APZ is the Agricultural Preserve zone for land under a Williamson Act contract. The county’s guide says the minimum lot size is typically 40 acres and land divisions are discouraged.

Do I need a permit to drill a well?

Yes. Environmental Health permits and inspects domestic wells under Chapter 9 of the County Code.

Can I build a dock on a Clear Lake lot?

Possibly, with a Lakebed Administrative Encroachment permit first, and a lease if the structure goes past the Low Water Mark. Structures must be set back 10 feet from neighboring property lines.

Do Fire Safe regulations apply to my lot?

They apply to new construction in the State Responsibility Area, and in Very High Fire Hazard Severity Zones for approvals after July 1, 2021. Confirm the parcel’s status before you design a road or driveway.

Who maintains a private road?

Without a written agreement, Civil Code 845 has easement users share repair costs in proportion to use.

Sources & notes

1. County of Lake, Land Development (Environmental Health).
2. County of Lake, Septic Site Evaluation Guide.
3. County of Lake Planning Division, A Guide to Zoning Districts (dated 2006); current text in the Lake County Code.
4. County of Lake, Shoreline Construction Requirements.
5. California Code of Regulations, Title 14, § 1270.03.
6. California Department of Conservation, Williamson Act FAQ (2024).
7. California Civil Code § 845 (text via california.public.law).

Notes: Zoning density figures come from a 2006 county planning guide; we could not open the current ordinance article, so confirm them with the Planning Division. Lakeport and Clearlake set their own zoning. No prices or market figures.

General information, not legal, tax or lending advice. Updated November 2026. Primary sources are linked in this guide.

Related: Lake County real estate · Where to live in Lake County · Buying land in California · Private road maintenance agreements · Lake County shoreline permits