Commercial Real Estate in Potter Valley: Main Street, Farm Uses and Eel River Water

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

Potter Valley is a farming valley north of Highway 20 in inland Mendocino County, reached by Potter Valley Road, with a short Main Street of shops, a school, a post office and a clinic. Commercial property here is mostly small Main Street buildings, farm businesses, wineries and processing sheds, and agricultural land with barns and shops. The valley is unincorporated, so Mendocino County decides land use, and with no public drinking water or sewer system, every commercial plan starts with the well and septic.

Who controls the parcel

Mendocino County Planning and Building Services applies the Inland Zoning Code, Division I of Title 20, which was replaced in full on September 10, 2024, per the state notice of determination. Valley-specific policy is in the Potter Valley section of General Plan Chapter 6, coded CP-PV.

Mendocino LAFCo’s Potter Valley Irrigation District review, adopted April 7, 2025 by Resolution 2024-25-11, describes the service picture:

Potter Valley Irrigation District (PVID), formed April 1, 1924, covers about 6,966 acres, of which about 4,602 are irrigated, and serves about 275 agricultural accounts. It supplies raw irrigation water only.
No drinking water provider. The review says no drinking water service exists in the region; residents and businesses use private wells, and it counts about 292 domestic wells within the district’s sections.
No sewer. Properties use onsite septic systems.
Potter Valley Community Services District serves as the umbrella agency for the Potter Valley Volunteer Fire Department.

The same review reports a population of 537 for the Potter Valley census designated place and notes that most land is zoned Agricultural with a 40-acre minimum (AG 40).

Potter Valley zoning for commercial, industrial and mixed use

The review lists General Plan designations in the valley of Agricultural, Rangeland, Suburban Residential, Remote Residential, Rural Community and Public Facilities. These County districts carry business uses. Confirm the zoning of a specific parcel with a County Letter of Zoning.

District	Intended uses	Notes for Potter Valley
A-G Agricultural (Ch. 20.052)	Crops, animals and processing of products raised on site	40-acre minimum; winery packing and processing permitted; farm sales and cottage industry by administrative permit; limited lodging by use permit
R-L Rangeland (Ch. 20.060)	Grazing and range uses on the valley edges	Resource use first
R-C Rural Community (Ch. 20.084)	Mixed homes, shops and limited industry in a town core	Without water or sewer district service, 40,000 sq ft minimum lot
C-1 Limited Commercial (Ch. 20.088)	Local retail and services	Commercial lots outside any water or sewer district need 40,000 sq ft
C-2 General Commercial (Ch. 20.092)	Full-service commercial core; lodging permitted	Same 40,000 sq ft fallback; 50 ft height
I-1 Limited Industrial (Ch. 20.096)	Light industry	Consistent with the plan’s goal of light industry at the town edge

The A-G chapter is the one most Potter Valley buyers will read. Its purpose is to keep land for crops and animals while allowing processing of products raised on the premises and some farm-related commerce. Setbacks are 50 feet on all sides and height is 50 feet. In the town districts, C-1, C-2 and R-C drop the commercial minimum lot size only with water and sewer district service, which Potter Valley does not have for domestic use. PVID is an irrigation district, so ask Planning how it treats a PVID parcel under these rules.

Main Street and farm businesses

The General Plan’s Potter Valley policies favor a compact center:

Keep it on Main Street. CP-PV-1 and CP-PV-2 concentrate mixed-use, commercial and public uses in the core and encourage infill. Action CP-PV-5.1 calls for a revitalization strategy including commercial expansion and consolidation on Main Street.
Light industry at the edge. CP-PV-6 accommodates commercial, light industrial and resource uses to meet local needs, and Action CP-PV-7.1 pursues light industrial and manufacturing employers at the edge of the town center.
Agriculture. CP-PV-7 supports expanding and diversifying orchards, grazing and vineyards. Under A-G, winery packing and processing is permitted outright, agricultural sales need an administrative permit, and general packing and processing for others needs one as well.
Gateways. Action CP-PV-7.2 considers a signboard on Highway 20 at Potter Valley Road, and Action CP-PV-7.3 adds gateway landscaping at Main Street and Eel River Road.
Access. CP-PV-8 calls for upgrading Potter Valley Road from Highway 20, which matters for trucking.

The plan describes the valley floor as mostly agricultural, with 5- to 10-acre ranchettes and a quick transition to forest and grazing land in the uplands.

Eel River water and the Potter Valley Project

PVID’s raw water comes from the Eel River through PG&E’s Potter Valley Project: water passes Cape Horn Dam and Van Arsdale reservoir and moves through a diversion tunnel to the powerhouse, with Scott Dam impounding Lake Pillsbury upstream. The LAFCo review says PVID’s four water rights allow up to 22,670 acre-feet a year at no more than 100 cubic feet per second.

The review also reports that the project’s federal license expired April 14, 2022 and that PG&E has since run it on year-to-year licenses, with PG&E’s schedule calling for a surrender application and decommissioning plan by January 29, 2025. It says several parties signed a memorandum of understanding in early February 2025 to advance a water diversion agreement. We have not verified the current status. For any farm, vineyard or processing business that depends on PVID water, get the latest from PVID and the regulators before you price the water.

Transfer tax, business tax and property tax

No city transfer tax applies. Fidelity National Financial’s transfer tax guide (rev. January 2026) lists Mendocino County at $1.10 per $1,000, customarily paid by the seller. The County Recorder collects it without posting a rate. Lodging operators remit transient occupancy tax and a Business Improvement District assessment through the Treasurer-Tax Collector. A change of ownership generally triggers Proposition 13 reassessment, though land under a Williamson Act contract is valued differently; ask the Assessor.

Due diligence that matters in Potter Valley

Test the well for yield and quality; there is no public drinking water system.
Confirm septic capacity for the business use with County Environmental Health.
If the business depends on irrigation water, confirm PVID service and the current Potter Valley Project status.
Order a County Letter of Zoning and check for an agricultural preserve contract.
Check access and truck routing on Potter Valley Road.
Work through our commercial due diligence checklist.

Questions people ask

Who provides water in Potter Valley?

PVID provides raw irrigation water only. LAFCo says there is no drinking water service, so properties use private wells.

Is there sewer service?

No. Properties use onsite septic systems.

Can I open a winery on agricultural land?

Winery packing and processing is permitted outright in A-G. Tasting rooms and events are not listed in that chapter, so ask Planning.

What is the minimum lot size in A-G?

Forty acres, with one home per legal parcel as the base density.

Where does the County want new shops?

On Main Street. The General Plan concentrates commercial and mixed uses in the core and light industry at its edge.

What happens to PVID’s water if the Potter Valley Project changes?

That is unsettled. LAFCo’s 2025 review describes the license expiration and a pending surrender process; check current status with PVID.

Does Diamond handle commercial property in Potter Valley?

Contact Matthew Martinez to discuss buying, selling or leasing commercial property in Potter Valley.

Sources & notes

Potter Valley Project status is as described in LAFCo’s April 2025 review. This page is general information, not legal or tax advice. Last reviewed October 2026 by Matthew Martinez.

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