Commercial Real Estate in Graton: County Zoning, Sewer Capacity and the Laguna Floodplain

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

Graton is a small west county crossroads between Sebastopol and Forestville, with a short main street of restaurants, a tasting room or two, small shops and service buildings along Graton Road and Ross Road, set among apple orchards, vineyards and the low ground of the Laguna de Santa Rosa watershed. It is unincorporated, so the County of Sonoma and Permit Sonoma decide land use, and a small sewer district decides how much new business the town can absorb. Check parcel zoning in the County’s zoning database before relying on this page.

Who controls the parcel

Zoning and permits: Permit Sonoma, under County Chapter 26. Graton has no city government or city transfer tax.
Urban service area: The County’s urban service area layer maps a Graton urban service area of about 278 acres, the planned limit of town-scale services.
Sewer: The Graton Community Services District handles only wastewater collection and treatment for the unincorporated community. It took over the old plant from the County in 2003 and has since built a new one.
Water: Graton is not named on Permit Sonoma’s water and sewer referral list, so confirm the water provider or well for each parcel.

Graton zoning for commercial, industrial and mixed use

County Article 10 supplies the commercial districts; the zoning map decides which apply in Graton.

District	Intended uses	Notes
C1 Neighborhood Commercial	Shops, services and offices for a rural neighborhood	Restaurants permitted or by use permit; bars and B&Bs by use permit; mixed use allowed
CR Commercial Rural	Homes and commercial together in a rural community	New commercial gets discretionary review; tasting rooms P*; restaurants and hotels not listed
LC Limited Commercial	Everyday needs	Restaurants P/C; contractor storage yards by use permit
C3 General Commercial	Wholesale, warehousing, light and medium manufacturing	Vehicle sales permitted
M1, M3, MP (industrial)	Limited urban industrial, limited rural industrial, industrial park	Article 12; not reviewed here
DA, LIA (farmland around town)	Orchards, vineyards, small farms	Tasting rooms and ag processing by use permit; farm stands permitted

County commercial buildings top out at 35 feet under Table 10-2.

What business uses fit Graton

Graton’s commercial strip is mostly small restaurants, cafes, galleries and service shops in older one- and two-story buildings. Under the County tables:

Restaurants. A restaurant is permitted or conditional in C1 and LC, but not listed in CR.
Tasting rooms. CR allows them subject to discretionary criteria (P*). On farmland, Table 6-1 makes them conditional.
Farm retail. Farm stands, farm retail and farmstays are permitted on agricultural land.
Small producers. Small-scale agricultural processing is P*, and larger processing needs a use permit.
Mixed use. Housing over a shop is allowed in C1 and LC, subject to the County’s mixed-use standards.

See our guides to tasting room space and Sonoma County agricultural zoning.

Sewer capacity: the gating item

The district’s about page says residences in its area must connect, with few exceptions, and that new hookups are available only in limited numbers within capacity. That matters most for restaurants, breweries and food businesses, which use more sewer than retail.

The Regional Water Board’s 2018 discharge permit describes the plant:

Capacity: 0.14 million gallons per day in average dry weather, with tertiary treatment.
Seasonal discharge: Treated water may go to Atascadero Creek only from October 1 to May 14, limited to 1% of creek flow. Nothing goes to the river system from May 15 through September 30.
Transfers: The permit lists recycled water uses and transfers to the Forestville Water District plant.

Sonoma Water’s regionalization flyer names Graton among four small west county plants studied for combining or connecting to a larger plant. The study is complete and a Project Advancement Report is in progress. No project has been approved.

Flood rules and the Laguna

Some low ground near Graton lies in the Laguna de Santa Rosa watershed. For FEMA AE-zone parcels in the Laguna and its tributaries, County Section 26-58-030(d) imposes a "zero net fill" rule: no fill unless an engineering analysis shows no loss of flood storage. Under Chapter 7B, commercial buildings in the floodplain must be elevated or floodproofed 12 inches above base flood elevation, and work reaching 50% of value over three years triggers full compliance. Check whether a parcel is in the Laguna AE area before planning a building pad or parking lot.

Vacation rentals and lodging

The County bars vacation rentals in R1, R2 and R3, on Williamson Act land and in LIA. The County’s 2023 cap and exclusion staff report did not propose a Graton zone, but the countywide rules still apply. Hotels are not listed in CR or C1. A farmstay on agricultural land, or a B&B by use permit, is the more realistic lodging path. See our vacation rental rules.

Transfer tax, business tax and property tax

The County Recorder charges $0.55 per $500, less assumed loans. There is no city tax in Graton. Sewer charges from the district are collected on the property tax bill. A change of ownership generally triggers Proposition 13 reassessment. We did not verify County business tax rules.

Due diligence that matters in Graton

Start with our commercial due diligence checklist, then:

Ask the Graton CSD how many sewer connections the parcel holds and whether more are available for your use.
Identify the water source and its capacity.
Pull the base zone and suffixes; CR means discretionary review for new commercial uses.
Check FEMA mapping and the Laguna zero-net-fill rule before planning grading.
For tasting or food production, confirm the permit path and any health permits.
Review the age and condition of older storefront buildings, including ADA access.

Questions people ask

Who provides sewer in Graton?

The Graton Community Services District, which handles wastewater only.

Can I get a new sewer connection for a restaurant?

Possibly. The district says hookups are limited by capacity, so ask before you sign.

Is Graton part of Sebastopol?

No. It is unincorporated Sonoma County with its own urban service area of about 278 acres.

Can I open a tasting room in Graton?

In CR it is P*, subject to discretionary criteria; on farmland it needs a use permit.

Can I fill a low lot to build?

Not in the Laguna AE floodplain unless engineering shows no loss of flood storage.

Is there a city transfer tax?

No; only the County’s $0.55 per $500.

Does Diamond handle commercial property in Graton?

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

Sources & notes

Note: The 2018 water board order was set to expire July 31, 2023; we did not confirm its renewal terms. We did not confirm which districts are mapped on Graton parcels, the water provider, or whether specific parcels are in the Laguna AE zone. Street and business descriptions are general. See also our Sonoma County commercial guide and Sonoma County multifamily guide.

This page is general information, not legal or tax advice. Last reviewed October 2026 by Matthew Martinez.

Inquire about a listing or to schedule a meeting

Matthew Martinez

Your inquiry is processed through our iHomefinder service. Review the form’s contact choices before submitting. Privacy Policy · Terms of Use.