Potomac Homes for Sale

Potomac is an unincorporated community and census-designated place in Montgomery County, Maryland, between I-270 and the Potomac River northwest of Washington. Most of what determines what you can do with a property here never appears on a listing sheet. A zoning letter fixes minimum lot area and how much of the lot may sit under structure. A sewer service category decides whether the parcel can ever leave septic. Soil and water table testing can only be done inside a narrow season, and that season was closed for all of 2026. Two layers of environmental review can reshape a building envelope after you already own it. What follows describes those mechanisms and names the office that will confirm each one for a specific parcel. Everything here was checked in August 2026, and the items that move — fees, hours, zoning standards, annual designations — are dated so a stale claim can be found and re-checked rather than trusted indefinitely.

The 2002 Potomac Subregion Master Plan still sets the terms

Land use across Potomac runs on the Potomac Subregion Master Plan, approved and adopted in 2002. The subregion covers roughly 66 square miles, bounded by I-270 and I-495 on the east, the Potomac River on the south, Seneca Creek on the west, and Darnestown Road and the City of Rockville on the north. Its organizing idea is protection of environmentally sensitive land alongside limited development, which is why most of what constrains a Potomac project is environmental review rather than density. Montgomery Planning published a performance review in 2024, the Potomac Subregion Master Plan Reality Check. The finding that matters to a buyer is that the plan's limits on extending sewer service into low-density areas have held in practice: the review cites six denials or deferrals of water and sewer category change requests in Glen Hills in March 2023 alone. A plan this old is a live constraint rather than history. As of August 2026 it remains the document a Potomac development application is measured against. Montgomery Planning's information counter (301-495-4610, 9 a.m. to 3:30 p.m. weekdays as of August 2026) will confirm what applies to a specific parcel.

Potomac Village has no town government, and some lanes nearby are designated rustic roads

Potomac is unincorporated. There is no town council and no town zoning; land use runs directly through Montgomery County. What people call Potomac Village is the commercial node where Falls Road (MD 189) meets River Road (MD 190) — neighborhood-scale retail rather than a regional center. The 2002 plan did not program it for significant expansion, so price the village as it stands rather than on anticipated infill. Retail tenancy turns over, so confirm any specific business is trading before you rely on it. One fixed point: Potomac Library, a Montgomery County Public Libraries branch, is at 10101 Glenolden Drive, and as of August 2026 it opens Monday through Thursday 10 a.m. to 8 p.m. and Friday and Saturday 10 a.m. to 6 p.m., closed Sunday. The lanes around the village are not all ordinary county roads. Montgomery County's Rustic Roads Program sits in the county code at Chapter 49 and designates particular roads as rustic or exceptional rustic. The list comes from the Rustic Roads Functional Master Plan, adopted in 1996; the County Council approved a comprehensive update on July 25, 2023, which brought the program to 112 roads, adding 16 and removing 3. Designation shapes how a road may be widened, maintained and improved, which matters if a new driveway, entrance or frontage improvement is in your plans. Segments in the Potomac area are on the list, including parts of Glen Road and Query Mill Road as of August 2026. Confirm a specific road's current classification with Montgomery Planning rather than working from an old map.

RE-2, RE-1 and R-200: what the zone letter actually controls

Much of Potomac's residential land carries one of three detached-house zones — RE-2, RE-1 or R-200 — under Chapter 59, the zoning ordinance the County Council adopted in 2014 and which took effect on October 30, 2014. The zone letter fixes minimum lot area, minimum lot width, front, side and rear setbacks, maximum building height, and maximum lot coverage. The minimum lot areas are the headline difference: two acres (87,120 square feet) in RE-2, 40,000 square feet in RE-1, and 20,000 square feet in R-200. On a teardown and rebuild the binding number is usually lot coverage rather than lot area. Under the standard method, and as of August 2026, coverage is capped at 25 percent in RE-2, 15 percent in RE-1, and 25 percent in R-200. That ordering is counterintuitive and worth pausing on: an RE-1 lot has twice the minimum land of an R-200 lot but a lower coverage percentage, so the two zones permit similar absolute footprints on their minimum lots. Height also differs. RE-2 and RE-1 cap a principal building at 50 feet. In R-200 the standard-method cap runs from 35 feet to 50 feet depending on lot size, and is lower when measured to mean roof height than when measured to the roof peak. RE-1 setbacks under the standard method are 50 feet from the street, 17 feet to a side lot line with 35 feet for both sides combined, and 35 feet at the rear. Take the figures for your specific zone off the current Division 4.4 tables in Chapter 59, or confirm them with Montgomery Planning, before designing to any of them.

The sewer service category, not the zoning, decides whether a lot can ever connect

Montgomery County's Comprehensive Water Supply and Sewerage Systems Plan assigns every parcel a water (W-) and a sewer (S-) category, and that assignment, not the zone, governs whether public service is available. S-1 covers areas served by community systems either existing or under construction. S-3 covers areas given immediate priority, with service generally provided within two years. S-4 covers areas programmed for the three- through six-year period. S-5 covers the seven- through ten-year period. S-6 means no planned community service within the plan's ten-year scope or beyond, and development must use private systems. The county does not use category 2, and it does not always assign the water and sewer categories in tandem — a parcel can sit in one category for water and a different one for sewer. Changing a category is a proceeding, not a request. The owner files with the Department of Environmental Protection, and DEP's review with the other agencies runs on a quarterly cycle. As of August 2026 DEP says a request on the administrative track typically reaches a public hearing four to seven months after the application, and one going through the County Council process typically reaches a Council hearing five to ten months after the application. In the Glen Hills area the question was settled deliberately. Following the Glen Hills Area Sanitary Study, the County Council adopted Resolution 18-423 in March 2016, keeping on-site septic as the primary wastewater method there; the Maryland Department of the Environment concurred in June 2016. That policy allows a single sewer connection for a qualifying existing property and bars using such a connection to support subdivision into more than one lot. Confirm a parcel's current categories and the current procedure with the Department of Environmental Protection.

Wells, septic testing, and what makes a Potomac lot buildable

Where public sewer is unavailable, a lot is buildable only once satisfactory water table and percolation or sand mound testing has established a sewage disposal area — an area large enough for both the initial drainfield and a reserve field. Well and septic permits and soils testing are handled by the Department of Permitting Services, not by DEP; its Well and Septic Section acts on behalf of the Maryland Department of the Environment and can be reached at 240-777-0311. Two features of the process govern deal timing. First, the water table test runs only during a declared wet season, typically February 1 through April 15, when groundwater sits at its seasonal high. This is the constraint to plan around, and 2026 is a hard example. As of August 2026 the DPS soils testing page states that applications for the 2026 wet season are no longer being accepted, and that the season remains closed because water table levels were insufficient. DPS says it may open a season beyond the traditional April 15 date if sustained precipitation raises water table levels, so check the page rather than assuming next February. Percolation and sand mound testing may be done at any time of year once sufficient water table testing is complete, except in restrictive soil types, where those tests must also fall in the wet season. Second, the sewage disposal area is real land taken out of the buildable envelope, and on a constrained lot it, rather than the zoning, decides where a house can sit or whether one fits at all. On the water side, a well permit must be obtained before drilling for any purpose, including potable water, irrigation and agriculture, monitoring and testing, geothermal systems and dewatering; a state drilling permit is also required. Flow testing is required after drilling and before a building permit issues, and Certificate of Potability sampling is required before a use-and-occupancy permit issues for a new house served by a potable well. Maryland's Real Property Article section 10-702 disclosure form asks the seller about water and sewer systems, including the source of household water and any treatment system. Get the direction of that statute right. A purchaser who does not receive the disclosure or disclaimer on or before entering the contract has an unconditional right, on written notice, to rescind and recover the deposit, exercisable at any time before receiving the statement or within five days after receiving it. A purchaser who does receive it on or before entering the contract has no section 10-702 right to rescind based on what it says. The statute sets out the specific ways that rescission right terminates. It ends if not exercised before the purchaser makes written application to a mortgage lender, where the lender disclosed in writing at or before application that applying ends the right. It also ends five days after a written disclosure from a lender that has received the application, where that disclosure says the right ends at the close of those five days. The form records only what the seller knows and is not a substitute for a well yield test, a water quality test or a septic inspection. This describes the mechanism rather than giving legal advice; confirm the current statutory terms, and whether section 10-702 applies to your transaction, with counsel.

Forest conservation and the floodplain district reshape the building envelope

Chapter 22A, the county's forest conservation law, applies along two different tracks, and the 40,000-square-foot figure attaches to only one of them. A person required to obtain approval of a development plan, a preliminary plan of subdivision or a site plan is covered without regard to tract size. The 40,000-square-foot threshold applies to a person required to obtain a special exception or conditional use approval, or a sediment control permit, who is not already caught by the plan-approval track — which a substantial Potomac rebuild often is. The law also reaches any cutting, clearing or other land-disturbing activity that would directly threaten the viability of a champion tree, wherever it stands. Exemptions exist, but the criteria are narrow and worth reading in full rather than assuming. Where the law applies, a forest stand delineation precedes plan approval, and the retention and planting obligations that follow can move a footprint. Separately, the county's Floodplain District is drawn more broadly than the FEMA maps many buyers check: it takes in the area subject to inundation in a 100-year storm from a drainage area of 30 acres or more, plus a 25-foot buffer. Work in it may require a Floodplain District Permit. Where no acceptable delineation exists, a floodplain delineation study is required first, and the Department of Permitting Services says its review typically takes four to six weeks per cycle. Budget for more than one cycle. M-NCPPC's Environmental Guidelines, approved in 2021, layer stream buffer, wetland and steep-slope constraints on top. Confirm current thresholds and review times with the Department of Permitting Services and Montgomery Planning; as of August 2026.

Potomac is on the 2026 list of 15% MPDU planning areas

Montgomery County's Moderately Priced Dwelling Unit program requires that at least 12.5% of the units in a new development of 20 or more units be moderately priced, under Chapters 25A and 59 of the county code. Bill 38-17, passed in 2018, raised that to 15% in high-income Planning Areas. Those are areas where at least 45% of the acreage in the area's census tracts carries a median household income at or above 150% of the countywide median, measured on the most recent five-year American Community Survey. The Planning Board makes the designation annually in January on new income data, so the list moves. Potomac is on the 2026 list, alongside Bethesda/Chevy Chase, Darnestown, Dickerson, Lower Seneca, North Bethesda, Olney and Travilah. The movement is real: Dickerson was added for 2026, and Kemp Mill/Four Corners and Poolesville came off. Check which year's list applies to a pending application rather than assuming last year's. Projects of 11 to 19 units do not owe MPDUs but owe a payment to the county's Housing Initiative Fund. As of August 2026 that payment is 0.5% of the purchase price of each unit; confirm the current formula with the Department of Housing and Community Affairs. The practical reach inside Potomac is narrow, because the two-acre RE-2 minimum makes 20-unit projects uncommon. The incentives run the other way: bonus density and additional height scale with the MPDU share provided. Re-check the current year's designation and the current incentive schedule with Montgomery Planning.

Protected land on two edges: the C&O Canal at Great Falls and the Agricultural Reserve

Potomac's southern edge is the Chesapeake and Ohio Canal National Historical Park. The Great Falls Tavern Visitor Center sits at 11710 MacArthur Boulevard, at about mile 14.3 of the towpath, in a building raised between 1828 and 1831 as a lockkeeper's house and travelers' lodging. The Great Falls Tavern area is the only part of the C&O Canal park where an entrance fee is charged. As of August 2026 it is $20 per private vehicle, $15 per motorcycle, or $10 per person on foot or bicycle age 16 and over, each valid seven days; children under 16 do not need a pass. An annual park pass is $35, valid one year from the month of purchase. The entrance station takes credit and debit only and does not accept cash. Only Section A of the Billy Goat Trail is reached from this area; Section B is reached from the Anglers parking area and Section C from Carderock. Pets are not permitted on Section A or on the boardwalk out to the Great Falls overlook at Olmsted Island; they are allowed on leash elsewhere in the park, including Sections B and C. Verify fees and access with the park before a visit. One common confusion is worth clearing: Great Falls Park is a separate National Park Service site on the Virginia bank in Fairfax County near McLean, administered as part of the George Washington Memorial Parkway — not the Maryland side. To the north and northwest, the Agricultural Reserve, created in 1980 and covering roughly 93,000 acres, caps density in the AR zone at one house per 25 acres. The prior baseline was one per five acres, and that five-acre rate is what owners were issued transferable development rights against, to sell into designated receiving areas.