Waterfront Homes in St. Mary's County: What Buyers Need to Know

Buyer's Guide · Waterfront · St. Mary's County

St. Mary's County is bordered by water on three sides, with the Potomac, the Patuxent, the Chesapeake, and dozens of creeks. Living on the water here is the dream for a lot of my buyers, and it can be everything you hope. It's also a purchase with more moving parts than a regular house. This guide covers what I check before anyone writes an offer on the water.

Types of Waterfront

• Open water: big views and breezes on the Potomac, the Patuxent, or the bay, with more exposure to wind, waves, and storms.
• Creek and cove: calmer water and often better protection for a boat, sometimes with shallower depths.
• Water view vs. water access: a view doesn't always come with a place to launch or tie up a boat.
• Community water access: some neighborhoods share a pier, ramp, or beach. Read the rules and fees.

The Pier

• Condition: pilings, decking, and any boat lift. Hire someone who inspects marine structures, not just a home inspector.
• Permits: ask the seller for the permits behind the pier, lift, and any bulkhead. Work in tidal waters generally needs state and federal approval through the joint Maryland Department of the Environment and Army Corps of Engineers application, plus county review.
• Plans to add or extend a pier: don't assume it's possible. Ask before you count on it.

Water Depth at Low Tide

A pier is only as good as the water at the end of it. Visit at low tide, ask the seller what boat they kept there, and if you have a specific boat in mind, check the depth before you commit. Some creeks are perfect for kayaks and too shallow for anything with a deep draft.

The Critical Area

All land within 1,000 feet of tidal water or tidal wetlands is in Maryland's Critical Area. The first 100 feet from the water (or more, on steep slopes or near wetlands) is a protected Buffer:

• Trees in the Buffer can only be removed if they're dead, dying, diseased, or hazardous, so a "view clearing" plan may not fly.
• Construction, clearing, and grading are generally prohibited in the Buffer.
• Plans for a new deck, addition, shed, or pool should be checked with the county before you count on them.

The Shoreline

Look at the bank, the marsh, and any existing bulkhead or stone. Erosion is a real long-term cost, and Maryland's Living Shoreline Protection Act makes natural, living shorelines the default, with bulkheads and revetments allowed only in certain cases. Read my guide to shorelines and erosion before you buy.

Septic and Well

Many waterfront homes here run on septic and a private well. If a septic system in the Critical Area ever needs replacing, Maryland requires a nitrogen-removing BAT system, which costs more than a standard one. Get a septic inspection and a well water test during your inspection period, and price a tired system into your offer.

Flood Zones and Insurance

Check the FEMA flood zone for any waterfront home and get a flood insurance quote early. If the home is in a high-risk flood zone and you're using a federally backed mortgage, your lender will require flood insurance. On some waterfront homes, insurance moves your monthly payment more than the interest rate does. Ask the seller for any elevation certificate, and ask your homeowners insurance agent about wind coverage too.

Survey and Boundaries

Make sure the pier, the shoreline, the house, and your property lines all match on a current survey. Erosion can change where the water's edge actually is, and you want to know exactly what you're buying.

Your Inspection Team

• A home inspector for the house.
• A marine contractor for the pier, lift, and bulkhead.
• A septic inspector and a well water test.
• A flood insurance quote and, if needed, a surveyor.

Resale and Value

Waterfront homes vary a lot in value based on depth, exposure, views, shoreline condition, and what can be built. Two homes on the same creek can be worth very different amounts. When I help you price an offer, I look at all of it, not just square footage. Thinking about selling a waterfront home instead? Start with a free valuation.

Where to Look

Waterfront shows up all over the county, from Piney Point, St. Inigoes and Ridge to the creeks around Leonardtown and Hollywood. Tell me what kind of water you want, whether that's deep water for a boat, a quiet creek, or a big view, and I'll narrow it down. Compare areas in the best areas to live in St. Mary's County.

Questions to Ask the Seller

• How deep is the water at the end of the pier at low tide, and what boat did you keep here?
• When were the pier, lift, and bulkhead built or repaired, and were they permitted?
• Has the shoreline changed while you've owned the home? Any erosion work?
• When was the septic last pumped and inspected? Any well water tests?
• Has the home ever flooded? Do you have an elevation certificate?
• What do you pay for homeowners and flood insurance?

The True Cost of Waterfront Ownership

Waterfront homes come with costs that inland homes don't: flood insurance in high-risk zones, pier and lift maintenance, shoreline work over time, and sometimes a more expensive septic system. None of that is a reason not to buy. It's a reason to budget for it up front, so the water stays a joy instead of a surprise.

Frequently Asked Questions

Sources: MDE/USACE tidal wetlands application booklet · Maryland DNR Critical Area FAQ · COMAR 26.04.02.07 (BAT septic) · Maryland's Living Shoreline Protection Act. Checked October 2026; rules and rates change, so confirm anything that affects your decision.