Buying a Home With a Shared Well in Montgomery County, MD

You found the right house in Potomac, North Potomac, or one of the outer pockets of Montgomery County where the lots get bigger and the public water main stops. Then the disclosure or the listing mentions something you weren't expecting: the home doesn't have its own well — it shares one with the neighbor.

That's not a reason to walk away. Plenty of great homes on the rural edges of the county run on a shared water supply. But it does change what you need to check before you're locked into the deal, and it adds one document to your due diligence that can quietly make or break your financing.

Here's how to think it through.

What buying a home with a shared well actually means

A shared well is exactly what it sounds like: one well supplies water to two or more properties. It might sit on your future lot, on the neighbor's, or on a small parcel between you. Water lines run from that single well across property lines to each house.

This is different from a home on its own private well and septic system, where everything is on your land and under your control. With a shared well, you're entering into an ongoing relationship with a neighbor over a resource you both depend on every single day.

That relationship works fine when three things are true: the well is healthy and produces enough water for everyone, there's a clear legal agreement spelling out who pays for what, and both owners actually follow it. When one of those pieces is missing, a shared well goes from a non-issue to a headache — and you want to know which situation you're walking into before closing, not after.

The shared well agreement is the document that matters most

If you take one thing away from this, make it this: buying a home with a shared well is really about the shared well agreement, not the well itself. The agreement is the recorded legal document that governs the arrangement, and it's the single most important thing to get your hands on early.

A proper shared well agreement should be recorded in the county land records and "run with the land" — meaning it binds you and every future owner, not just the people who signed it. A good one spells out:

• Ownership — who owns the well, the pump, the pressure tank, and the water lines to each home
• Access easement — the legal right to reach the well for testing, repair, and replacement, even when it sits on the other owner's land
• Cost sharing — how routine costs (electricity, testing, disinfection) and big-ticket repairs (a new pump or, someday, a new well) are split, usually equally per household
• Maintenance and decisions — who handles repairs, how you agree on major expenses, and what happens if someone won't pay

Ask the seller for a copy of the recorded agreement up front. If they can produce it, read it carefully and make sure the terms are ones you can live with for years. If there is no recorded agreement — just a "handshake" understanding between neighbors — treat that as a real problem to solve during the contract period, not a technicality to smooth over at the settlement table.

The reason this matters so much comes down to your loan. Most conventional lenders want to see a deeded right of access and a binding, recorded maintenance agreement before they'll finance a home on a shared well. Government-backed loans are stricter still: FHA generally requires that a shared well serve no more than four homes, that a recorded agreement exists among all the owners, and that the appraiser attach it to the report. VA loans similarly require a permanent access easement and a formal sharing agreement, plus proof the well can supply safe water to every connected home. In the $700,000-to-$2 million range that's common out here, you're most likely using conventional or jumbo financing — but the underlying rule is the same across the board: no compliant, recorded agreement can mean no loan.

What to check during your inspection period

The standard home inspection covers the house. It does not, on its own, tell you whether a shared well is healthy, legal, and adequate. Treat the well as its own line item, and use your inspection contingency to investigate it while you still have room to negotiate or walk.

Here's your checklist when buying a home with a shared well:

1. Get the recorded agreement. Confirm it exists, is recorded in Montgomery County land records, runs with the land, and covers ownership, access, and cost sharing in terms you accept.
2. Test the water. Order a potability test — bacteria and nitrate at minimum. Maryland's environmental agencies recommend annual testing, and your lender or the sale itself may require a passing result. Water quality is shared too, so a problem at the well is a problem for both homes.
3. Check the yield. Ask whether the well produces enough water for everyone at once. FHA's benchmark is at least three gallons per minute to each property over a four-hour period — a useful yardstick even on a conventional loan. A well that runs dry when two households shower at 7 a.m. is a lifestyle issue, not just a paperwork one.
4. Assess the equipment. Find out the age and condition of the well, pump, and pressure tank, and when they were last serviced. Ask for any records of past shared repairs and how those costs were handled.
5. Look at how it's held. Confirm the well's location and the easement on a survey, so you know exactly whose land it sits on and where the lines run.

Montgomery County's Department of Environmental Protection oversees private and shared well testing and permitting, and the Department of Permitting Services handles well permits — good resources when you want to confirm a well's history or requirements. A new potable well needs a Certificate of Potability before it's put into service, so if the well is newer, ask to see that paperwork.

You should also read the Maryland seller disclosure closely for anything about the well's condition, past dry spells, water-quality issues, or disputes with the neighbor over cost. A shared well is a latent condition a seller is expected to disclose — silence on the form doesn't mean silence on the history, so ask direct questions.

If any of this turns up a gap — a missing agreement, a marginal water test, an aging pump the two households never funded a reserve for — that's exactly what your contingency period is for. You can ask the seller to record a proper agreement before closing, or negotiate a credit or repair the same way you would after any inspection finding. This is the point where having someone who has walked buyers through rural-MoCo well deals earns its keep, because the fix usually needs to happen on a deadline.

The bottom line

A shared well isn't a dealbreaker — it's a due-diligence item with a paper trail. Get the recorded agreement, test the water, confirm the well produces enough for both homes, and make sure your lender's requirements are met before your contingencies expire. Do those four things and you'll know precisely what you're buying.

If you're weighing an offer on a home with a shared well in Potomac, North Potomac, or anywhere in Montgomery County, I'm happy to walk you through the agreement and the checklist before you're under contract. Reach out anytime — it's a lot easier to sort this out on the front end than to unwind it later.