"Arsenic is a common groundwater contaminant in New Hampshire that occurs at unhealthy levels in well water in many areas of the state." That single sentence, word for word, is what New Hampshire requires a home seller to hand a buyer before closing. The buyer reads it, signs it, and the state's job is done. No lab. No sample. No result. Just a signature acknowledging that the risk exists somewhere in New Hampshire.
If you are buying an existing home on a private well in Salem, that signature is the entire state-mandated water check. But if you are buying new construction, or a home where the well was recently drilled or repaired, a second and much stricter rule kicks in, one written by the Town of Salem rather than the State of New Hampshire, and it asks for a lab result instead of a signature.
What the State Actually Requires You to Sign
New Hampshire's notification law, RSA 477:4-a, was updated effective January 1, 2025, to add poly- and perfluoroalkyl substances, better known as PFAS, alongside the existing warnings about radon, arsenic, and lead paint. The law requires the seller or seller's agent to hand the buyer a written notice before the purchase contract is signed, and the buyer acknowledges receipt with a signature. That's the full extent of the obligation. A separate statute, RSA 477:4-d, requires the seller to disclose the type and location of the water supply and the date of the most recent test, if one exists, but neither statute forces anyone to actually open a sample bottle.
For a resale where the well has sat untouched for years, this is genuinely the whole requirement at the state level. A buyer can waive further testing, close on schedule, and never see a lab report. Plenty do, because nothing in state law stops them.
The Ordinance Almost No One Reads Before They Break Ground
Salem's own health code tells a different story for a specific slice of transactions. The town's rule is direct: well test results and requirements must be met before the town will issue a Certificate of Occupancy on any building served by a well. The test in question is run under EPA Method 524.2, costs about $120, requires a special sampling bottle from the Water Resource Management Lab or the town's Health Department, and takes roughly two weeks to come back. No result, no occupancy permit. That is a pass or fail check with a building's move-in date attached to it, and it applies regardless of what the state's paperwork-only rule says.
This is the layer that a generic "New Hampshire well testing" guide skips entirely, because it's true for the state and false for this one town. Buyers of new construction, or buyers whose purchase involves permitting for a modified or newly drilled well, are the ones who run into it. Buyers closing on a decade-old resale with an unchanged well are not.
Two Tests, Two Different Jobs
Here is where the friction actually shows up in a contract, and it isn't the requirement itself. It's what the requirement covers.
| Requirement | Triggered By | What It Actually Tests | Typical Cost |
|---|---|---|---|
| State notification (RSA 477:4-a) | Every New Hampshire home sale | Nothing. A signed acknowledgment that arsenic, radon, lead, and PFAS can occur in NH well water | No lab cost, a signature only |
| Salem Certificate of Occupancy test | New construction, or any well requiring town permitting | Volatile organic compounds, via EPA Method 524.2 | Around $120 |
| NHDES Standard Analysis (optional, not mandated anywhere) | Recommended for any well purchase, not required by state or Salem code | Arsenic, bacteria, nitrate, radon, uranium, and common minerals; PFAS added on request | Roughly $85 to a few hundred dollars, depending on the lab and panel size |
Passing Salem's Certificate of Occupancy test tells you the water is clear of the specific organic compounds that method screens for. It says nothing about arsenic or radon, which are the two contaminants New Hampshire's own Department of Environmental Services flags as the state's most widespread naturally occurring well problems. A brand-new home in Salem can clear its town-mandated VOC test, receive its occupancy permit, and still be sitting on a well that has never been checked for either one.
Why the Bedrock Under Salem Makes This More Than a Formality
Nearly half of New Hampshire's residents draw their household water from a private well rather than a public system, according to the state's comparison of public water service and private wells. Statewide, about 30 percent of bedrock wells exceed the enforceable arsenic limit of 5 parts per billion, and roughly half have radon at levels the state considers concerning. Rockingham County, where Salem sits, is part of the granite terrain where this occurs most often.
Salem itself is not a town where every household is exposed to that risk in the same way. The town's own municipal supply draws from Canobie Lake between May and October, switches to Arlington Pond through the colder months, and since June 2020 has drawn additional volume from the Southern New Hampshire Regional Water Line, sourced from Manchester Water Works via Lake Massabesic, a system that also supplies Windham, Hampstead, Atkinson, and Plaistow. Homes on that municipal line are covered by regular, published water quality testing. Homes on private wells, whether in newer subdivisions beyond the municipal service area or on lots where a well predates any town water extension, are the ones for whom the arsenic and radon numbers above are personally relevant, and where neither the state's signature nor Salem's VOC test actually checks for either.
Where This Shows Up on a Closing Timeline
For a resale buyer, the state's notification requirement adds paperwork but no delay. You sign the acknowledgment, and the closing proceeds on whatever schedule the rest of the contract sets.
For a new-construction buyer, the timeline works differently. The builder cannot obtain a Certificate of Occupancy until Salem's VOC test clears, which means a failed or delayed result can push a move-in date by the two weeks the test takes, or longer if a retest is needed. That is a real scheduling risk worth asking about before you sign a purchase agreement on a home that hasn't been built yet.
For anyone buying or selling a home already on a private well, whether the house is new or fifty years old, the smart move is treating Salem's requirement as a floor, not a ceiling. A full NHDES Standard Analysis, ordered during the inspection period and paired with a PFAS add-on given the 2025 disclosure update, answers the questions the town's test was never designed to ask.
Before You Write the Offer
A few concrete steps make this simple rather than stressful:
- If you're buying new construction, ask the builder for the Certificate of Occupancy test results directly, and confirm whether VOCs were the only parameter checked.
- If you're buying a resale on a well, ask the seller for the date and result of the most recent test under RSA 477:4-d, and don't assume "no known problems" means "recently tested."
- Order a full NHDES Standard Analysis with a PFAS panel during your inspection period regardless of what the town requires, since arsenic and radon are the two risks neither the state signature nor Salem's local test actually screens for.
- If you're on the selling side and your home draws from a private well, our Salem homeownership costs guide and our pre-listing upgrade checklist both cover how well and septic maintenance fold into your carrying costs and your listing prep.
A Few Common Questions
Does Salem's Certificate of Occupancy test cover arsenic or PFAS? No. The town's test runs under EPA Method 524.2 and checks for volatile organic compounds only. Arsenic, radon, and PFAS require separate testing that neither the state's notification law nor Salem's occupancy requirement mandates.
If I'm buying a resale, do I need to worry about the town's C.O. test at all? Only if the well itself is being modified or newly permitted as part of your purchase. A standard resale with an existing, unmodified well is governed by the state's disclosure requirement, not Salem's occupancy rule.
Is a passing Salem VOC test enough for my lender? Check with your lender directly. Many lenders financing a well-served home, particularly through FHA or VA loans, require their own water test as a mortgage condition, and that requirement is separate from and often broader than Salem's local VOC check.
Buying or selling a home on a private well in Salem involves more layers than a quick search usually turns up, and getting the sequence right protects your timeline as much as your water quality. If you're weighing a new-construction purchase, a resale on a well, or listing a home that needs this conversation before it hits the market, reach out to DiPietro Group to schedule a free buyer or seller consultation, and we'll walk through exactly what applies to your specific property before you sign anything.
