Somebody told you your land has wetlands on it. Maybe it was the town. Maybe it was a neighbor who tried to build twenty years ago and gave up. Maybe you just walked the back corner in April and sank to your ankles.
And then somebody else — usually the same person — told you that means you can't build on it.
That second part is almost always wrong.
Here's what's actually true: wetlands don't make land unbuildable. They make land smaller. The question isn't whether you can build. The question is how much dry, workable ground is left after the state draws its lines, and whether that leftover piece is big enough for what you want to do. On a lot of the parcels we walk in Coventry, Scituate, Foster, Glocester, and Exeter, the answer is yes — sometimes twice over.
Let's go through how it actually works.
First: the rules changed, and your neighbor's advice is out of date
If anyone has told you about a "perimeter wetland" or a "riverbank wetland" on your property, they're using language Rhode Island retired.
Rhode Island rewrote its freshwater wetlands rules, fully effective July 1, 2022. The old terms — perimeter wetland and riverbank wetland — are gone. In their place are two new ones you need to know:
Jurisdictional Area. This is the outer boundary of what the state can regulate on your parcel. It reaches 200 feet out from a river, stream, or drinking water supply reservoir, and 100 feet out from every other kind of wetland.
Buffer Zone. This is the piece inside the jurisdictional area that's actually designated for protection — the land next to the wetland that's supposed to stay in its natural, vegetated condition.
Those two numbers do different jobs, and mixing them up is where most of the panic comes from. The jurisdictional area is where the state gets to look. The buffer zone is where the state says don't touch. They are not the same distance, and on most parcels the buffer zone is considerably smaller.
How wide is the buffer on your land? Somewhere between 25 and 200 feet
There's no single answer, and anyone who gives you one without seeing your parcel is guessing.
Rhode Island uses a tiered system. Buffer zones range from 25 feet to 200 feet, and the width depends on three things stacked together: which region of the state you're in, what type of wetland you have, and specifics about that particular resource.
The state is split into four regions: River Protection Region 1, River Protection Region 2, the Urban Region, and Drinking Water Supply Watershed overlays. River Protection Region 2 alone covers about 40% of Rhode Island's land area, while the Urban Region — the Providence metro plus parts of Woonsocket, North Kingstown, West Warwick, Newport, Middletown, and Westerly — covers roughly 8%.
Region matters a lot. A stream in River Protection Region 1 or 2 carries a 100-foot buffer zone. That same stream in the Urban Region carries 50 feet. Ponds in the Urban Region come in at 50 feet or 25 feet depending on which pond. Same water, different line, purely because of where the map says you are.
Wetland type matters too. The types the state considers most sensitive — bogs, fens, marshes, evergreen swamps, swamps with a rhododendron understory, and most vernal pools — get the highest protection at 100 feet. A plain red maple swamp is treated differently than a vernal pool, even if they look about the same to you in November.
And there's a wrinkle worth knowing before someone surprises you with it: an extra 25 feet gets added to the buffer zone when a different wetland type or subtype shows up within 50 feet inward of the wetland edge.
Translation: the buffer on your land is a specific number, and it takes a wetland scientist walking your property to produce it. Not a guess off a map. Not a number from the guy at the counter. Not this article.
What can you actually do inside a buffer zone?
The standard is avoidance. Projects are supposed to be designed to steer clear of altering the vegetated buffer inside the buffer zone.
But — and this is the part that gets lost — "avoid" is a design instruction, not a prohibition on the whole parcel. If altering some buffer genuinely can't be avoided, there's a variance path, and it requires you to show you avoided and minimized the impact as much as the project allowed.
There's also a Freshwater Wetlands General Permit that RIDEM issued effective October 31, 2022, covering a defined list of smaller projects and activities. And there's a formal process to have your wetland edges verified by the state, which is the step that turns "there's something wet back there" into a surveyed line you can build a plan around.
None of this is fast, and none of it is free. But "slow and expensive" is a completely different sentence than "impossible," and those two get confused constantly.
If your land is in Seekonk, Rehoboth, Swansea, Attleboro, North Attleborough, or Wrentham
Cross the state line and the whole framework changes.
Massachusetts runs on the Wetlands Protection Act, administered by your local conservation commission rather than a state office. The buffer zone there is 100 feet from a wetland resource area, and the Rivers Protection Act adds a 200-foot riverfront area along perennial rivers and streams — narrowed to 25 feet in certain densely developed urban areas.
The bigger difference is local. Over 100 Massachusetts communities have adopted their own wetlands bylaws on top of the state law, and those local rules are often stricter. Two identical parcels — one in Rehoboth, one in Seekonk — can face genuinely different requirements. In Massachusetts, you call the conservation commission before you do anything else.
What this means for what your land is worth
Here's the part nobody says out loud.
A parcel with wetlands is worth less than the same parcel without them. That's real, and we're not going to pretend otherwise.
But the discount most owners assume is dramatically bigger than the discount the market actually applies — and that gap is exactly where people lose money. Owners who believe their land is worthless sell it that way. They take the first mailer offer. They accept a number built on the buyer's assumption that the whole back half is dead ground, when in fact the buyer has already done the math and knows better.
Here's the math that actually matters: total acreage, minus wetland, minus buffer zone, equals your buildable area. Then compare that number against your town's minimum lot size and frontage requirements, and you'll know how many lots you have.
We've seen five-acre parcels where a full acre disappeared into wetland and buffer — and still yielded two conforming building lots, because the wetland sat in a corner instead of down the middle. Geometry decides this, not acreage. Where the wet part sits matters more than how much of it there is.
How to find out what you actually have
In order, cheapest first:
You don't need to do all four to find out whether it's worth pursuing. You need step one and step two to know whether steps three and four are worth paying for.
We'll do the first two for you, free
That's the whole offer. Tell us where your land is, and we'll pull the buffer region, check your town's zoning, look at where the wet ground appears to sit, and tell you straight what we think you've got.
Sometimes the answer is "you've got two lots here and you should not take that mailer offer." Sometimes it's "the wetland runs right through the middle, one house is the realistic ceiling, and here's what that's actually worth." Either way you get a real answer instead of a guess, and you're under no obligation to do anything with it.
We're two licensed Rhode Island realtors who work land — not houses with the roof left off. If your parcel is somewhere in Rhode Island or just across the line in Massachusetts, we've probably driven past it.
This article explains how Rhode Island and Massachusetts wetland rules generally work. It isn't a legal opinion or an engineering determination, and rules change. Confirm anything specific to your parcel with RIDEM, your town, or your local conservation commission before you make decisions based on it.