"Does this land come with anything I should know about?" is a question buyers ask about wells, septic systems, and easements. It is almost never a question they ask about tax status, and on a lot of Lancaster County acreage, that is the question that costs the most.
Lancaster County has an unusual amount of land enrolled in Pennsylvania's Act 319 program, known statewide as Clean and Green. It is a preferential tax assessment that lets qualifying farmland, forest land, and open space get taxed on what it produces rather than what it could sell for. That distinction is exactly why so much acreage around the county carries it, and exactly why a buyer who does not check for it can end up holding a bill that has nothing to do with the price they paid.
Why the Covenant Shows Up So Often Here
Land in Lancaster County is expensive by Pennsylvania standards. The statewide average for farmland ran around $9,560 an acre in 2025, while parcels in Lancaster and Chester counties routinely trade well north of $20,000 an acre. When land is worth that much on the open market, the gap between a fair-market-value tax bill and a use-value tax bill is enormous, and Clean and Green exists specifically to close that gap for landowners who keep the ground in agricultural use, agricultural reserve, or forest reserve.
To qualify, a parcel generally needs to be at least 10 contiguous acres, or smaller if it generates at least $2,000 a year in gross income from an agricultural commodity for three years running. Once enrolled, Lancaster County's own assessment office describes the typical result as roughly a 50 percent reduction in the property's assessed value. On a farmette or former dairy parcel selling in the mid-six figures, that is not a rounding error. It is often the difference between a tax bill a buyer can absorb and one that changes the math on the purchase entirely.
The Bill That Shows Up When Plans Change
The tradeoff for that tax break is a seven-year lookback. If the land's use changes to something inconsistent with the covenant, the owner at the time of the breach owes rollback taxes: the difference between what was paid under Clean and Green and what would have been owed at fair market value, for up to the seven most recent tax years, plus 6 percent interest for each of those years.
The triggers are more common than most buyers assume. Building a second residence on the property beyond the limited split-off allowance, starting a commercial venture on more than two acres of enrolled land, or converting a working pasture into something that no longer meets the agricultural, reserve, or forest categories can all break the covenant. The program does carve out some flexibility. An owner can split off up to two acres a year for a residence, capped at the lesser of 10 acres or 10 percent of the original enrollment, and rollback taxes on that scenario apply only to the acreage split off, not the whole tract. A landowner can also run a small commercial enterprise on up to two enrolled acres without disturbing the rest of the parcel, so long as it does not interfere with production on the remainder. But step outside those specific allowances and the rollback applies to the entire original tract, not just the piece that changed.
One breakdown of Act 319 offers a simple version of the math: if land was taxed at $1,000 a year under Clean and Green but would have owed $5,000 a year at market value, the owner could face the $4,000 annual difference for up to seven years, plus interest on each year's shortfall. On a parcel that has been enrolled for two decades, that difference compounds into a real number fast.
| Enrolled use | Typical rollback trigger | What owes |
|---|---|---|
| Personal residence expansion within split-off limits | No breach if under 2 acres/year, 10-acre cumulative cap | Rollback on split-off acreage only |
| Second residence beyond split-off allowance | Breaches the covenant | Rollback on the entire original tract |
| Small home business on 2 acres or less | Allowed as a "rural enterprise" carve-out | Rollback on those 2 acres only |
| Commercial venture beyond 2 acres, or full conversion to non-ag use | Breaches the covenant | Rollback on the entire original tract |
Whose Name Ends Up on the Bill
Here is the part that catches buyers off guard: the covenant does not stay with the seller. When enrolled land changes hands, the county typically continues the existing Clean and Green status and has the new owner file a fresh application in their own name. If the new owner does not want to stay enrolled, or if their plans for the property later break the covenant, the rollback liability belongs to whoever holds title when the breach happens, not necessarily whoever benefited from the tax savings for the previous 20 years.
That liability is also not something the county assessor's office assigns or negotiates. It is a matter for the agreement of sale. A buyer and seller can agree the seller covers rollback taxes triggered by the sale itself, or that the buyer assumes the covenant going forward, but if nobody puts that in writing, the default is simply that the taxes follow the land and land into the lap of whoever owns it when the use changes.
A County Redrawing the Line Right Now
There is a second layer to this that makes timing matter more than usual this fall. Lancaster County is in the middle of its first countywide property reassessment since 2018, with a new base year taking effect in 2027. Reassessment notices started arriving in mid-June 2026, and the special appeal window tied to that reassessment closed on August 3, 2026. For most property owners, the next chance to appeal an assessment will not come until 2028.
The reassessment also introduces a new wrinkle specific to properties with real acreage. For the first time, Lancaster County's property records are separating a parcel's land into a "primary homesite" portion and a "residual" portion, rather than treating the whole lot as a single value. The county has not published a detailed public explanation of exactly how that line gets drawn on a given parcel, but the new category itself tells you assessors are now valuing the house-and-yard footprint differently from the surrounding ground on the same record, which is worth understanding on any property where a meaningful share of the price is in the land rather than the structure.
The complication compounds because the actual dollar impact will not be known for months regardless of how that split lands. County and municipal millage rates for 2027 will not be set until the end of December 2026, and school district millage rates will not be finalized until June 2027. A buyer signing an agreement of sale on acreage this fall is committing to a purchase price today without knowing what either portion of that record, homesite or residual, will actually cost them once the reassessment is fully in effect.
What to Ask Before You Write the Offer
None of this should scare a buyer away from a property with real acreage. It should change what gets asked before an offer goes in.
- Is the parcel currently enrolled in Clean and Green, and has it been enrolled continuously or was it recently added?
- Has any portion ever been split off or separated, and if so, when and how much?
- Does your intended use of the land, whether that is a second dwelling for a family member, boarding horses commercially, or running a business from the property, fit inside what the covenant allows without triggering a breach?
- Has the agreement of sale addressed who is responsible for rollback taxes if enrollment status changes after closing?
- Has this parcel's 2027 reassessment record already reflected a primary homesite and residual acreage split, and if so, is it clear how the county drew that line on this specific property?
A title company or real estate attorney familiar with Act 319 transfers can usually answer the enrollment and split-off history questions directly from county records before you are under contract, which is the point where this information actually changes your negotiating position.
A Few Questions Worth Asking Before You Close
Does every acreage listing in Lancaster County carry this covenant? No. Only parcels actively enrolled in Clean and Green are subject to rollback exposure. The county's property assessment records will show enrollment status, and it is worth confirming directly rather than assuming based on how the land looks.
Can the rollback tax liability be split or assigned at closing? Yes. It is a negotiated term of the agreement of sale, not something the assessment office decides. Buyers and sellers routinely address it explicitly when a change in use is anticipated.
Will the 2027 reassessment automatically raise taxes on enrolled land? Not automatically. Pennsylvania law requires taxing bodies to stay revenue-neutral in a reassessment year, so millage rates get adjusted downward as assessed values rise countywide. What changes for any individual parcel, including how the new primary homesite and residual acreage categories affect it, will not be clear until the county finalizes those classifications and the 2027 millage rates are set.
This is general information about how a Pennsylvania tax program works, not tax or legal advice for your specific parcel. For anything transaction-specific, a real estate attorney or the Lancaster County Property Assessment Office is the right next call.
If you are looking at acreage in Lancaster County and want a second set of eyes on what a specific listing's covenant history and reassessment status actually mean for your offer, Jared Gettel works these details into every conversation before a client writes a number down. Let's Connect.
