If you are buying in Thornton, odds are you are buying a ski house, and odds are you plan to rent it some of the time. The inspection that matters is the one that compares how the system was designed to be used with how you are actually going to use it. Those two are often not the same.
Thornton’s pitch to buyers is location. The listings say it over and over: about twenty minutes to Loon, about twenty to Waterville Valley, under two hours from Boston. Route 49 runs up the Mad River through the corner of town and is the only road into Waterville Valley in winter. Exit 29 and exit 30 put you on I-93. So people buy here from away, often without ever having lived on a septic system, and often planning to put the place on a rental site to cover the mortgage.
Census estimates put more than a third of the town’s housing as vacant at any given time, which in a place like this mostly means second homes. A house that sat empty Monday to Friday for fifteen years and then gets rented every weekend to twelve people is going to work its system much harder than it ever has. Some condo communities set their own rules — at one on Upper Mad River Road the minimum short-term stay is seven days — but the tank does not care how long the stay is. It cares how many people are flushing.
The other number buyers miss is the bedroom count. A septic design in New Hampshire is approved for a number of bedrooms. A new build on Upper Mad River Road recently came to market advertising a six-bedroom system, which tells you the builder knew exactly how buyers here think. A 1980s chalet with a three-bedroom design and a finished basement with two more beds in it is a different story.
Ask the seller for the approved septic design before you make an offer, not after. If there is not one on file, you want to know that while you can still negotiate.
The design on file, if there is one. How many bedrooms the system was approved for, when, and how big the tank is supposed to be. We compare that to the listing and to what is actually in the house.
The tank, pumped and opened. We do not inspect a full tank. We pump it and look at the walls, the inlet and outlet, the baffles or tees, and the level the liquid was at before we started — a tank sitting above its outlet is telling you the field is struggling.
The field. We walk it, probe it and look for wet spots, odor, or grass that is greener than everything around it. On a house that has been mostly empty, a field can look healthy for years and only show trouble once somebody actually uses it.
How you plan to use it. Tell us if you are going to rent. We will tell you plainly whether the system looks sized for that. That answer is worth more to you before the closing than after it.
River frontage. If the house is on the Pemi, ask whether it falls inside the state’s protected shoreland. If it does, the seller owes a site assessment under RSA 485-A:39 before the transfer, and we can usually do it on the same trip.
A full pump-and-inspect evaluation generally runs $400–$700 with the pumping included, so you are not paying twice. Shoreland site assessments under RSA 485-A:39 are quoted by the property. Send the address and the closing date and you will have a number back the same day.
Yes, and you should tell us up front. A system that worked fine for one family two weekends a month may not keep up with a full house every weekend. We look at the approved bedroom count, the tank size and the field’s condition and tell you whether we think it will hold up under the use you have in mind.
Not always. The septic design is approved for a specific number of bedrooms, and a finished basement or a converted attic does not change the approval. If the design on file says three and the listing says four, that is a question for the seller and your lawyer before closing.
Mixed. A lightly used system usually has less sludge in the tank. But a field that has been resting can hide a problem that only shows up once you start using it hard. That is why we pump and look at the tank empty and probe the field, rather than just running water for twenty minutes.
It applies to developed property in the protected shoreland, and whether a particular lot on the river is inside it is a parcel question. Check the NHDES shoreland map or ask the listing agent early. If it applies, the assessment has to be done before the sale closes, so it is not something to leave to the last week.
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