There’s a line in the Merrymeeting watershed plan that belongs on every purchase and sale agreement written in this town: require full evaluations, not brief assessments. Somebody around here got tired of the fifteen-minute kind.
Action items 61 through 63 of that plan are worth ten minutes of your time if you’re buying or selling here. They ask the town to inspect every conversion from seasonal to permanent occupancy, every sold property and every property transfer for correct septic size and design. They ask that cesspools be replaced. They ask that a system be fixed before a place changes hands rather than argued about afterward. And they put the cost on the property owner in plain words. None of that is state law today — it’s a recommendation, adopted or not as the town decides. But it tells you exactly what the people who study this water think an inspection here ought to be, and it is not somebody lifting a lid, looking pleased, and driving off.
There’s already a record accumulating, too. In 2018 the steering committee compiled septic information on 568 parcels within 250 feet of surface water on this side of the town line — age, distance to water, seasonal or year-round use. The plan recommends the town keep that going as a database through Code Enforcement, and then suggests voluntary dye testing, and then, and this is genuinely in the cost table with a dollar figure beside it, a canine scent detection team to work the shoreline systems. Make of that what you will. The direction only goes one way. The paper trail on septic systems in New Durham is getting longer, not shorter.
Separate from all of it, RSA 485-A:39 still applies and always has. Sell developed waterfront inside the protected shoreland and a septic site assessment is required at transfer. Known requirement, fixed cost, and it still turns into a fire drill roughly half the time because nobody thought about it until the closing date was on the calendar. Order it the week you list and it never becomes anyone’s problem.
Before you spend a dollar on anybody’s inspection, pull the state file. Septic designs approved since 2015 are on the NHDES website and you can have yours in about five minutes. Anything older, ask the town what’s in the property folder. Walking into an inspection already knowing the tank size and the design bedroom count changes the questions you know to ask — and if there’s no design anywhere at all, that itself is the finding.
We pump. An evaluation that never opens the tank is a stroll around the yard with a clipboard, and you can do that yourself for nothing. Empty, we can read the inlet baffle, the outlet tee, the concrete at the waterline, and whether what you own is one of the steel tanks that quietly rusted through sometime in the nineties. We locate and open the distribution box. We probe the field for saturation. And we run water from inside the house, so we’re watching the system do its job rather than looking at it asleep.
We size it against the house. This is the part the plan is really asking for and the part a cheap inspection skips entirely. A tank and field designed around a two-bedroom camp in 1971 is not a failing system — it may be in excellent shape — but it is the wrong system for the four-bedroom year-round house somebody framed onto it in 2004. Bedroom count, occupancy and the design on file, held up against each other. When they don’t line up we say so in writing, with the numbers, and we don’t soften it.
You get a document. Written report with photographs, normally inside two days, with the tank and field measured off permanent points on the lot so the next owner starts out holding a map instead of a rumor. Separation distances to the well and to the water get noted where anything looks tight. If there’s frontage we handle the 485-A:39 assessment on the same trip rather than making it a second mobilization and a second invoice. We’ll work with your agent or your attorney directly, and around showings.
And if the answer is bad, the report is worth more to you than good news would have been. A written finding with photographs and a design comparison is a negotiating instrument. “The inspector seemed a little concerned” is not. We’ll give you a realistic range for what the fix or the replacement runs on that specific lot — which on shorefront depends less on the system than on whether the ground has anywhere to put one — and we’ll tell you plainly when the next call needs to be to a septic designer instead of to us.
A full pump-and-inspect evaluation generally runs $400–$700 with the pumping included, so nobody pays twice for the same work. Shoreland site assessments under RSA 485-A:39 are quoted by the property and can normally be done on the same visit, which is worth asking about when you book — it saves a second trip down a driveway that’s often long. Send the address and the closing date and you’ll have a number back the same day.
For most properties, not as a matter of state law — and that’s exactly why buyers here should insist on one. The waterfront exception is real: RSA 485-A:39 requires a septic site assessment when developed property inside the protected shoreland changes hands. Away from the water it comes down to what the buyer negotiates for. The town’s own watershed plan recommends inspection at every sale and transfer, which is a fair signal of where local thinking sits even where nothing obliges anybody yet.
A shoreland site assessment under 485-A:39 is a specific statutory deliverable about the system’s siting and suitability on a waterfront lot. A full evaluation is the broader thing: pump the tank, read it empty, open the d-box, probe the field, load the system with water, and compare the whole works against the size of the house. They overlap and they are not interchangeable. On lake frontage you frequently want both, and doing them on one visit costs less than doing them on two.
We can, with a caveat that goes in the report rather than being left for you to discover. Frozen ground and snow cover limit what anybody can honestly say about a leach field, and a place that has been shut down since fall will present very well in March no matter what it actually is. So we spell out which specific findings the conditions constrained. A buyer is much better served by a report that names its own limits than by a clean one that quietly means we couldn’t see.
It’s something, and it isn’t evidence. Septic systems fail slowly and then all at once, and a system in the last two years of its life produces no symptoms whatsoever inside the house. It’s also worth remembering that the seller’s use may not resemble yours — a couple using a camp on summer weekends can be entirely honest about thirty untroubled years on a system that will not survive a family of five living there through a winter.
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