Scroll listings for rice ground, walnut orchards, or grazing land in Colusa County long enough and a pattern shows up. Two parcels sit close in size and soil class, yet one is priced meaningfully below the other. The only visible difference in the listing copy is a single line: enrolled in a Williamson Act contract, taxes will remain low.
That line reads like a bonus. It isn't. The lower price and the lower tax bill exist for the same reason, and that reason comes with a clock attached. A buyer should consider how long the contract has been in effect and Colusa County's authority to shorten it further almost every August.
The Discount Is The Restriction, Not A Bonus
The Williamson Act, formally the California Land Conservation Act of 1965, lets a landowner sign a contract with the county agreeing to keep the land in agriculture or open space. In exchange, the county assessor values the property based on what it can earn as farmland rather than what it could sell for if someone wanted to subdivide or develop it. The California Department of Conservation, which oversees the statewide program, estimates the tax savings run from 20 to 75 percent depending on the parcel.
That's a real number, but it isn't a gift. It's the price of accepting that the land can't legally become five-acre ranchettes, a storage yard, or a subdivision without first getting out of the contract. The lower assessed value and the development restriction are the same transaction viewed from two sides. A buyer who only sees the tax bill and skips the restriction is pricing half the deal.
How Colusa County Contract Terms Have Changed Since 2019
One detail buyers should understand before entering a contract. Colusa County adopted a state provision, Government Code Section 51244, known as AB 1265, that allows the county to shorten contract terms, affecting the tax benefit. On August 27, 2019, the Board of Supervisors voted to reduce standard 10-year Williamson Act contracts to nine years and 20-year Farmland Security Zone contracts to 18 years, cutting the tax savings available to contract holders by roughly 10 percent.
That wasn't a one-time adjustment. The county's own site notes the Board holds a public hearing every year to decide whether to keep implementing the provision, and Colusa County News reported it did so again following a hearing on August 16, 2022. Colusa County says landowners get 90 days after each decision to file a notice of non-renewal if they want to preserve their current contract length, and, if they do not, the shorter term applies.
So the enrollment a buyer sees recorded against a parcel today isn't a fixed benefit frozen at signing. The county has applied a term reduction and can review annually whether to continue it. A buyer should verify the parcel's recorded contract and current tax treatment rather than relying on the listing.
Acreage Alone Does Not Show Enrollment Status
There's a second local detail that changes how two nearby parcels compare. Colusa County sets a minimum lot size for new Williamson Act enrollment. One ranch listing in the Williams area, just over 2,575 acres, includes a zoning disclosure.
A buyer comparing nearby parcels should check whether each one is enrolled. Acreage alone won't tell you which situation you're in. The recorded contract, or its absence, will.
How A Williamson Act Contract Can End
Plans change. A buyer who takes on a Williamson Act parcel expecting to eventually build something the contract doesn't allow should understand the available exit paths.
Nonrenewal is the standard path. The landowner files a notice. The remaining term, now nine years for a standard contract in Colusa County or 18 for a Farmland Security Zone parcel, simply runs out.
Cancellation has a fee. Colusa County says state law sets a cancellation fee of 12.5 percent of the property's unrestricted fair market value.
Anyone buying enrolled land with development in mind should look closely at the recorded contract and its remaining term before making plans.
Williamson Act Activity Appeared on the Board's 2025 Agenda
Williamson Act activity in Colusa County isn't a dusty statute nobody touches. County Board of Supervisors agendas from 2025 show it in active use. One item involved rescinding an older contract, number 99-26, and re-entering the parcel into a new contract, WA25-08, specifically to allow a tentative parcel map to be recorded. Another involved rescinding and re-entering a separate contract, number 25-01, tied to a family enrollment under the Kalfsbeek name.
The Act also shapes bigger proposals. The Janus Solar and Battery Storage Project, which would connect to the electrical grid through PG&E's existing Cortina Substation, required a formal review of its compatibility with the county's Williamson Act program before the project could move forward. If a solar developer has to clear that review, a buyer planning something as modest as a second residence or a small ag-tourism venture on enrolled ground should expect the same question to come up.
Before You Write An Offer
- Confirm enrollment status directly with the Colusa County Assessor's Office rather than relying on the listing description alone.
- Request the recorded contract and its legal description, not just a summary, to check what the documents say.
- Ask whether a notice of non-renewal has already been filed on the parcel.
- If the parcel's eligibility is relevant, verify whether it's actually enrolled or simply eligible, since eligibility and enrollment are not the same thing.
- If your plans involve anything beyond straight farming, request a written compatible-use determination before you remove contingencies.
A Few Questions Ranch Buyers Ask Before Escrow
What should I review before closing on land with a Williamson Act contract? Review the recorded contract to understand the parcel's tax treatment and restrictions.
Can I cancel a contract quickly if my plans change after closing? Cancellation carries a 12.5 percent fee on unrestricted fair market value, so don't count on it as your exit plan.
Does acreage alone tell me whether a parcel has a contract? No. Confirm enrollment status directly rather than assuming from size.
Land carrying a Williamson Act contract can be one of the better values in Colusa County agricultural real estate, but only for a buyer who understands exactly what they're taking on and for how long. Amber W. Torres has spent more than a decade closing exactly this kind of transaction across Colusa County's ranch, orchard, and row-crop ground. If you're evaluating a Williamson Act parcel, on either side of the deal, reach out for a straight conversation about what the contract actually means for your timeline and your numbers.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
