California
Buying Land in Lake County, California
Lake County -- built around Clear Lake, the oldest lake in North America -- is a rural North Coast Range county that has been through some of California's largest wildfires in the past decade, and that hosts a portion of The Geysers, the largest geothermal energy field in the world.
A county that has repeatedly burned -- and what that means for buying and building
Lake County's mountainous, chaparral- and oak-woodland-covered terrain has proven highly fire-prone over the past decade: the 2015 Valley Fire burned across a large area of the county, the 2016 Clayton Fire burned near Lower Lake, and the 2018 Mendocino Complex Fire (a combination of the River and Ranch fires) became, at the time, one of the largest wildfires in recorded California history, burning extensively across Lake, Mendocino, Colusa, and Glenn counties. These are well-documented, completed historical events, not an ongoing situation -- but their cumulative effect on the county's land-use and building environment is very much current.
A large share of Lake County's wildland-urban interface is mapped by CAL FIRE within Very High Fire Hazard Severity Zones, which trigger specific state and local building-code requirements (ignition-resistant construction materials, defensible-space clearance obligations) for new construction and can materially affect property insurance availability and cost. Before buying land here -- especially in forested or brush-covered terrain -- confirm the parcel's fire-hazard severity zone designation with CAL FIRE and Lake County Community Development, and ask directly about current insurance market conditions in that specific area, since availability has changed substantially across fire-affected parts of California in recent years.
The Geysers: the largest geothermal field in the world
The Geysers, a geothermal field straddling the Lake-Sonoma county line in the Mayacamas Mountains, is the largest geothermal energy field in the world by developed generating capacity, with commercial power production dating to the 1960s -- among the longest continuously operating renewable-energy resources in the country. A meaningful portion of the field's steam wells and infrastructure sit within Lake County.
If you're evaluating land in or near The Geysers for its geothermal-leasing potential, or buying near existing geothermal infrastructure, see the dedicated wind-solar-leasing page below for what a landowner should ask before signing any lease.
Clear Lake: an ancient lake with real, ongoing water-quality challenges
Clear Lake is widely regarded as the oldest natural freshwater lake located entirely within California, and among the oldest lakes in North America -- its basin has held water continuously for a very long geological timescale. It's also the largest natural freshwater lake located entirely within the state and a major recreational and economic asset for the county.
The lake has a long-documented history of nutrient loading (from a combination of natural watershed geology and historical land use) that fuels cyanobacteria, or blue-green algae, blooms during warmer months -- a genuine, recurring water-quality issue rather than an occasional anomaly. This can affect recreational use, property value, and water-supply considerations for lakefront and near-lake land. Ask the Lake County Water Resources Department about current lake conditions, any active water-quality advisories, and applicable shoreline development regulations before buying property near Clear Lake.
Who to Call Before Buying Land in Lake County
Fire hazard severity zone maps are maintained by CAL FIRE but enforced through Lake County's own building code -- confirm both the state hazard designation and the county's specific building requirements.
Planning & Zoning
Lake County Community Development Department
Zoning designations, fire hazard severity zone status, and building or subdivision feasibility for a specific parcel.
Other
CAL FIRE, Sonoma-Lake-Napa Unit
Confirming a parcel's Fire Hazard Severity Zone designation and defensible-space requirements.
Other
Lake County Water Resources Department
Clear Lake water-quality conditions and shoreline development regulations.
Septic / Onsite Wastewater
Lake County Environmental Health Division
Septic (OWTS) permitting and well permitting for a specific parcel.
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Get local guidanceTopics Specific to Lake County
Sources
- Lake County Community Development Department — County of Lake, CA (accessed 2026-09)
- Fire Hazard Severity Zones — CAL FIRE (accessed 2026-09)
- 2018 Mendocino Complex Fire — CAL FIRE (accessed 2026-09)
- The Geysers geothermal field — California Energy Commission (accessed 2026-09)
- Clear Lake water quality — County of Lake, CA (accessed 2026-09)
Last reviewed 2026-09