If your St. Mary's County home has a private well and a septic system, buyers and lenders will want proof that both work. The sellers who close on time pull their records early, know what kind of septic system they have, and handle inspections before problems show up in the middle of a contract. A well and septic don't scare buyers. Surprises do.
Here's exactly what to gather, which inspections to expect, how the BAT septic rules work in St. Mary's County, and who to call for each piece. For the full selling process, see my step-by-step St. Mary's seller guide.
Where Do I Find My Septic and Well Records?
Start with the county. The St. Mary's County Health Department says you can search Health Department records on the county's GIS map by address or tax ID. If you can't find them there, email a records request form to the Environmental Health Division at smchd.env@maryland.gov or call 301-475-4321.
Look for these documents:
- The septic permit and the as-built drawing showing where the tank and drain field are
- The number of bedrooms the system was approved for
- Any repair or replacement permits
- Your well completion report, which shows the well's depth and when it was drilled
Why Does the Septic Bedroom Count Matter?
Because buyers, appraisers and lenders compare it to what the listing says. If your home is marketed as four bedrooms and the septic permit was approved for three, expect questions.
It's much better to find that out before you list. Then you can describe the home accurately and answer the question before a buyer's inspector raises it. If the numbers don't match, ask the Health Department what the permit allows.
Do I Need a Septic Inspection to Sell?
Many buyers and lenders ask for one. When it happens, Maryland requires a licensed inspector: since July 1, 2022, "any individual performing a property transfer inspection for an on-site sewage disposal system must be licensed," according to the Maryland Department of the Environment.
You don't have to get one before you list, but there's a good case for it. If something's wrong, you find out on your schedule instead of the buyer's, and you can fix it, price for it or disclose it.
Keep your pumping receipts too. A history of regular pumping shows the system has been cared for.
What Is a BAT Septic System, and Do I Need One to Sell?
A BAT (Best Available Technology) system removes extra nitrogen before wastewater reaches the ground. Whether one is required depends mostly on how close the property is to the water:
- Outside the Critical Area: since November 24, 2016, properties outside the 1,000-foot Critical Area are no longer required to install BAT, according to the St. Mary's County Health Department. BAT may still be required where soil won't support a conventional system.
- Inside the Critical Area: a new or replacement septic system must use BAT under Maryland regulation COMAR 26.04.02.07.
These are general rules. Whether a specific system needs BAT depends on the property, its soils and its location, so confirm with the St. Mary's County Health Department before you plan around it.
Selling a home doesn't by itself trigger a BAT upgrade. But waterfront buyers know a future replacement in the Critical Area means BAT, so they'll ask about the system's age and condition. My waterfront guide covers the Critical Area from the buyer's side.
If you already have a BAT unit, gather the service contract and maintenance records, and make sure its alarm and power are working before showings.
Can a Grant Help Pay for a BAT Upgrade?
Sometimes. The county's Bay Restoration Fund program can cover the cost of a BAT system, its installation, electrical hookup and two years of operation and maintenance. Failing systems in the Critical Area get top priority, applicants must meet income limits, and the grant must be approved before the BAT is installed.
Separately, the Maryland Department of the Environment says homes on septic pay a Bay Restoration Fee of $60 a year, which follows the owner of record. If your system is failing and you're planning to sell, ask about the grant early. Approval takes time.
Grant eligibility, funding and approval timing are set by the program, so confirm them with the Health Department before you build a repair plan around a grant. Paying the Bay Restoration Fee doesn't by itself make you eligible.
What If the Septic Inspection Finds a Problem?
You have choices, and none of them have to sink the sale. Most sellers do one of these:
- Repair it before settlement with a licensed contractor, and keep the paperwork for the buyer.
- Offer a credit or a price change so the buyer handles the work after they own the home.
- Replace the system through a permit with the Health Department. Inside the Critical Area, a replacement must be BAT under COMAR 26.04.02.07, so ask about the Bay Restoration Fund grant before you commit.
Which option works best depends on the repair, your timeline and your buyer's loan. Talk it through with your agent before you answer the buyer, because the choice affects your net and your settlement date.
What Will Buyers Ask About My Well and Septic?
Expect the same handful of questions, especially from buyers moving from areas with public water and sewer:
- How old is the septic system, and when was it last pumped?
- How many bedrooms is the system approved for?
- Is the home inside the Critical Area, and is the system BAT?
- How deep is the well, and when was the water last tested?
- Is there a water treatment system, and who services it?
Having written answers ready, with your records attached, turns these from worries into selling points. It also helps buyers shopping from another duty station, who often see your home on video first. My PCS selling guide covers selling to remote buyers.
Will the Buyer's Lender Test My Well Water?
Often, yes. Whether a water test is required depends on the buyer's loan and local rules, so plan on the question coming up.
For VA loans, VA Lenders Handbook, Pamphlet 26-7, Chapter 12, Topic 16 sets the rules once a test is required. The water must meet the local health authority's requirements, the sample must be collected by a disinterested third party, never the veteran or another interested party, and the test is valid for 90 days.
That's the VA's rule. Other loan types and lenders can set their own water-test requirements, so ask the buyer's lender what it needs and when.
That 90-day window matters on your timeline. A test done too early may need to be repeated before settlement. Testing on your own before you list still helps, because you can fix a problem before a buyer's test finds it. My VA-ready tips cover the rest of VA prep.
When Should I Schedule Each Step?
Order matters, because some results expire and some take weeks to fix. Here's a simple sequence that works for most St. Mary's sellers:
- Before listing: pull your Health Department and well records and confirm the approved bedroom count.
- Before listing or early in the contract: have the tank pumped and inspected by a licensed inspector, so there's time to fix anything found.
- Before listing: test your own well water if you haven't recently, so a problem like bacteria can be treated and retested.
- During the contract: expect the buyer's own inspections and any lender-required water test. For a VA loan, that test needs to stay inside its 90-day window through settlement.
- Before settlement: hand over service records for any BAT unit or water treatment system.
Your agent can line these dates up with your listing date and the buyer's contract deadlines so nothing lapses.
What Does Good Well and Septic Prep Look Like?
Example scenario: This is a made-up example, not a real client.
Picture a seller in Mechanicsville listing a 4-bedroom home on two acres. Before listing, she pulls her records and confirms the septic was permitted for four bedrooms. She has the tank pumped and inspected by a licensed inspector, and a private well test comes back clean.
When her VA buyer's lender requires a water test, a third party collects a new sample, as VA requires, and it passes. Settlement stays on schedule. Without that prep, a problem found in week four could have pushed closing back.
What Should Be on My Well and Septic Checklist?
Well and Septic Checklist for Sellers
St. Mary's County
- Septic permit, as-built drawing and approved bedroom count
- Pumping and repair receipts
- A recent septic inspection by a licensed inspector
- BAT service contract and maintenance records, if you have one
- Well completion report
- A recent water test, plus service records for any treatment system
Who Should Answer Each Part?
- St. Mary's County Health Department, Environmental Health: permits, records, bedroom count and BAT questions (301-475-4321).
- A licensed septic inspector: the property transfer inspection.
- A certified lab or the local health authority: water testing.
- The buyer's lender: whether their loan requires a water test.
- Your agent: timing inspections so results stay current through settlement, and how to describe the system in the listing.
What Mistakes Do Sellers Make With Wells and Septic?
- Listing more bedrooms than the septic permit allows without knowing it.
- Testing too early. On a VA loan, the test is valid for 90 days.
- Collecting the water sample yourself when a lender needs a third party to do it.
- Ignoring a BAT alarm. Buyers notice, and so do inspectors.
- Waiting on a grant you haven't applied for. Bay Restoration Fund approval comes before installation.
The bottom line: pull your records, test early enough to fix problems but late enough to stay current, and know whether you're in the Critical Area. To see where your home stands, start with a free home valuation, and read what it costs to sell in St. Mary's County for the rest of your numbers. You can also see how I help St. Mary's sellers.
Frequently Asked Questions
Many buyers and lenders ask for one, and Maryland requires the inspector to be licensed for property transfer inspections since July 1, 2022, per the Maryland Department of the Environment. Getting one before you list helps you avoid surprises. My seller guide covers when to schedule it.
Selling alone doesn't require one. Since November 24, 2016, homes outside the 1,000-foot Critical Area aren't required to install BAT, and inside the Critical Area a new or replacement system must use BAT. See the waterfront guide for more on the Critical Area.
Search the county GIS map by address or tax ID for Health Department records. If they're not there, email the Environmental Health Division at smchd.env@maryland.gov or call 301-475-4321.
VA Lenders Handbook, Pamphlet 26-7, Chapter 12, Topic 16 says the test is valid for 90 days from the date certified by the local health authority. Plan the timing with your agent so it stays current through settlement. My VA-ready tips cover other VA prep.
A disinterested third party, such as the local health authority, a commercial testing laboratory or a licensed sanitary engineer, according to VA Lenders Handbook, Pamphlet 26-7, Chapter 12, Topic 16. The veteran or any other interested party can't collect or transport the sample.
The Maryland Department of the Environment says it's $60 a year per user of a septic system or holding tank, and it follows the owner of record. Learn how it shows up at settlement in what it costs to sell.
Sources: St. Mary's County Health Department: environmental health records · Maryland Department of the Environment: onsite systems · St. Mary's County Health Department: 2016 BAT rule change · COMAR 26.04.02.07 (BAT in the Critical Area) · St. Mary's County Health Department: Bay Restoration Fund · MDE: Bay Restoration Fund FAQs · VA Lenders Handbook, Pamphlet 26-7, Chapter 12, Topic 16 on water testing (July 2017). Checked October 2026; rules and rates can change, so confirm anything that affects your decision.
This article is general real estate information, not legal, lending, tax, or insurance advice. Talk with the right licensed professional about your specific property.
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