Pump a Thornton tank every two to three years, sooner if it was installed in the 1980s and nobody has looked at the baffles since. That is most of them. The town’s population roughly quadrupled between 1970 and 2000, and nearly every house built in that run went in with its own tank and field. They are all getting old together.
Look at the census numbers in a row and you can see the septic problem coming. 594 people in 1970. 952 in 1980. 1,505 in 1990. 1,843 in 2000. Then another 35 percent in the ten years after that, to 2,490, and 2,708 by 2020. A town that had barely changed since the Civil War — it had 967 people in 1860 — tripled in thirty years and then kept going.
None of that growth came with a sewer pipe. The chalets up Route 175, the houses on the side roads off US 3, the A-frames somebody put up on a weekend in 1979 because Waterville Valley had just gotten big: drilled well, septic tank, leach field, every time. Which means Thornton has a great many systems that were installed within a few years of each other by a few different crews, and they have been aging in lockstep ever since.
A concrete tank from 1985 can be perfectly fine. A steel one from the same year usually is not, and there are still steel tanks in this valley. The outlet tee on a forty-year-old tank has had forty years of gas eating at it. The lid has had forty years for somebody to lose track of where it is. And a lot of these houses have changed hands two or three times, so the person who knew is long gone.
Once we find your lid, take a picture with something fixed in the frame — the corner of the house, the well cap, a big rock. The next owner will thank you, and so will whoever pumps it in three years.
The interval. NHDES says every two to three years for a typical household and we agree. A couple living in a three-bedroom on Route 175 all year sits at the three-year end. A ski house that is full every weekend from December through March and rented out in foliage season is a two-year tank, maybe less. A place you use six weekends a summer can go longer, and we will say so.
Finding the thing. On the newer builds there is usually a design on file and we can go almost straight to the lid. On the 1970s and early 80s houses there often is not. We probe from where the pipe leaves the foundation and dig by hand. If it is buried two feet down and you are paying for that digging every visit, a riser to grade is worth quoting.
Emptying it, not skimming it. Liquid, scum, and the sludge off the floor. The sludge is the part that ends up in your leach field if it stays, and it is the part a fast job leaves behind.
Looking while it is open. With the tank empty we can see the inlet and the outlet, whether the baffles or tees are still attached, whether the walls are sound, and whether the liquid was sitting higher than the outlet when we arrived — which tells you the field is slow. On an older tank that look is honestly worth as much as the pumping.
A standard 1,000–1,250 gallon tank runs $300–$500 to pump. Size, how far the truck has to park from the lid, and how much digging the lid takes are what move the number. If we open it up and find something that changes the job — a rotted tee, a steel tank, a second compartment nobody mentioned — we stop and tell you before we go any further.
Not that we have ever pumped around. The houses along Route 175, US 3 and the side roads run on private septic and drilled wells, and the condominium developments run their own shared systems. Even the town’s own Thornton Station Meeting Hall went out to bid for a septic tank and leach field built to a state-approved plan.
Not necessarily. A concrete tank that age can have plenty of life left. What wears out first is usually the outlet tee or baffle, and with a steel tank the whole bottom edge. The only way to know is to pump it and look at it empty, which takes about ten minutes once the lid is off.
Count the people, not the weekends. A ski house with eight or ten people in it most weekends from December through March, plus a few summer visits, can put as much through a tank as a small year-round family. Two to three years is still the right range. Rentals push it toward two.
For newer houses there is usually an approved design that shows the tank and field. For houses from the 1970s and early 80s there often is not, or it does not match what was actually built. If you have a drawing, have it out when we come. If not, we will find the lid the slow way and you can mark it for next time.
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