274 parcels platted between 1959 and 1998 at a median 2.135 acres, most of them in sewer service category S-6, where private septic is the permanent wastewater method.
Great Falls Estates is in Potomac, Maryland, in Montgomery County — not in Great Falls, Virginia. The two names surface in the same searches constantly, and they are different counties, different school systems, different zoning codes and different closing costs. What actually defines the Maryland subdivision is its wastewater status. Most of its parcels are in sewer service category S-6, and on a lot with no established sewage disposal area that single classification governs the calendar, the buildable envelope and the cost of a rebuild.
The Maryland riverfront at this point is the Chesapeake and Ohio Canal National Historical Park, whose Great Falls Tavern Visitor Center stands at 11710 MacArthur Boulevard, around mile 14.3 of the towpath. Great Falls Park — the National Park Service site most people picture — is on the Virginia bank in Fairfax County, administered as part of the George Washington Memorial Parkway. Great Falls Estates takes its name from the Maryland side of that geography and sits in ZIP 20854 with a Potomac mailing address. A listing that says only “Great Falls” is worth checking against the county record before you compare it to anything.
The subdivision was recorded in pieces: 84 plats between 1959 and 1998, by Great Falls Farms Corporation and by W.C. & A.N. Miller. It holds 274 parcels zoned RE-2, with a median lot of 2.135 acres and a largest parcel of 12.17 acres. Because the plats span forty years, lot geometry and street pattern are not consistent from one section to the next the way they are in a subdivision recorded in a single filing, and the oversized parcels sit alongside ones at or just above the two-acre minimum. Read the plat for the specific lot rather than assuming the subdivision's median describes it.
In a sample of 269 parcels, 218 fall in sewer service category S-6: no community sewer service planned within the county plan's ten-year scope or beyond, so development uses private systems. A house here depends on a septic system, and new or replacement construction depends on establishing a sewage disposal area with room for both the initial drainfield and a reserve. The gating step is the water table test, which the Department of Permitting Services allows only during a declared wet season, typically February 1 to April 15. As of August 2026 the DPS soils testing page states the 2026 season is closed and applications are no longer accepted, because water table levels were insufficient. That can push a study a full year. DPS Well and Septic is at 240-777-0311; a category change is a formal proceeding through the Department of Environmental Protection, not a request, so do not underwrite on a future connection.
Eighty-two houses here were built in the 1960s and 110 in the 1970s, with a median year built of 1974. Where an original house has reached the end of its useful life, the land supports replacement, and teardown activity is ongoing. Two ceilings shape what replaces it: the RE-2 lot coverage cap of 25 percent under the standard method as of August 2026, and the land committed to the initial and reserve drainfields, which comes out of the buildable envelope before the zoning math starts. Chapter 22A forest conservation review attaches to plan approvals without regard to tract size. Confirm all three with Montgomery Planning and the Department of Permitting Services before designing.
Great Falls Estates is served by Potomac Elementary School, Herbert Hoover Middle School and Winston Churchill High School. No homeowners association is mapped over the subdivision, so there is no architectural review committee, no mandatory assessment and no resale package — which also means no covenant is enforcing consistency on a rebuilt house next door. MCPS boundaries are revised periodically; confirm the current assignment for a specific address with the school system. As of August 2026.
Great Falls Estates sits within Potomac — that guide covers the zoning, permitting and site constraints that apply across the wider area.
Artur can confirm what applies to a specific address here — lot, zoning, association documents and school assignment — before you write an offer.
