Most of Tamworth is built on the biggest stratified drift aquifer in New Hampshire. Sand and gravel, thirty or forty feet of it in places. Nearly everybody outside the village is on a private well drilled into it. So a failing leach field here isn’t a puddle in the yard. It’s a water quality problem, and it belongs to whoever’s downhill.
The master plan put it about as plainly as a town document can: the same glacial sand that makes Tamworth easy to build on makes the aquifer easy to contaminate, most of the built environment sits right on top of it, and most residents rely on private wells nobody monitors. That’s the whole repair story in three sentences. In a clay town a broken field shows up as a soggy lawn. In Tamworth it shows up as a nitrate number on a well test, sometimes yours, sometimes the neighbor’s.
The other thing we run into is what got built without anyone looking. The select board was talking about it in the spring of 2025 — lots in current use with a second and third little cottage on them for rentals, campsites going in where there weren’t any. No zoning, no building code, so no one at the town office was in a position to ask what those extra beds were draining into. The state still requires an approved design for any new or replacement system; that rule doesn’t care what the town does or doesn’t have. But a lot of those cottages are on the tank the original house came with, and the field was sized for one kitchen.
Then the old stuff. Tamworth has houses on lots of record from before 1969 with no limits on building at all, and summer places in the Chocorua basin assembled from two or three buildings dragged together a hundred years ago. When one of those systems fails, the first job is figuring out what’s actually in the ground. Sometimes it’s a tank and a field. Sometimes it’s a tank, a dry well, a second tank nobody mentioned, and a pipe that goes toward the Swift River.
Get the well tested when you get the septic looked at. In Tamworth the two are the same conversation, and the well result tells us more about the field than the field does.
We start by pumping the tank and looking, because a good third of “my field failed” calls are a collapsed baffle, a crushed pipe between house and tank, or a distribution box that’s tipped and sending everything down one lateral. Those are real repairs with real prices and they don’t need a state permit. We’ll tell you if that’s what you’ve got.
If the field itself is done, that’s a new design and a NHDES construction approval, and in Tamworth it usually goes fast because the soil is what every designer wants — deep, sandy, well-drained. Where it gets interesting is the setback to wells. Yours and the neighbors’. On a half-acre lot in Chocorua village with three wells within a stone’s throw, finding seventy-five feet from every one of them is the design problem, and it can push the field somewhere you didn’t expect. On a steep lot up 113A it’s the slope. The subdivision rules bump lot sizes on 15–25% grades for a reason; a field on a pitch like that needs to be built to hold.
What we won’t do is patch a field that’s leaching into the aquifer because a patch is cheaper. We’ll give you both numbers and our honest recommendation. Might cost us the job. That’s fine.
Small repairs — a baffle, a section of pipe, a distribution box — are quoted on site once the tank is open, and most fall well under the price of a new system. Full leach field replacement is a design-and-permit job and depends on the lot, the well setbacks and what we find when we dig. You’ll get the written number before a shovel goes in.
Yes. Septic design and construction approval is a state rule, run by NHDES, and it applies in every town whether or not the town has zoning. Tamworth’s lack of a building code changes nothing about it. A licensed designer draws it, the state approves it, then it gets built and inspected.
Because your leach field is the last stop before the groundwater, and in Tamworth that groundwater is the well. Sand and gravel move water fast and filter it poorly. A field that’s been overloaded or is too close to a well puts what’s in the tank into what’s in the glass. That’s why the setbacks are what they are.
Only if the system was designed for the extra bedrooms. Most weren’t. If the field is starting to fail, the honest fix is a system sized for everything that drains into it. We’ll look at what’s there and tell you whether the existing tank can carry it or not.
Sometimes, if the existing field is sound and there’s room that meets the setbacks. That’s a designed expansion with state approval, not an afternoon with a backhoe. On a small village lot it’s often not possible and a replacement is the only real option. We’ll be straight about which it is.
We open the tank, run a camera and a locator, and follow the pipes. Old summer places built from moved buildings can have more than one tank and more than one outlet. Finding all of it is the first hour of any repair and it’s worth every minute.
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