Radon Mitigation in Raymond, NH

The Quick Version: Worried about radon in Raymond? Test it. Raymond sits on New Hampshire granite, the same rock that drives radon across the state, and most of the town is on private wells. So the gas can show up in your air and your water. Rockingham County is EPA Radon Zone 2 (moderate, 2 to 4 pCi/L predicted), but it is one of the state’s higher-radon counties, and statewide over 35% of homes tested come back at or above the EPA action level of 4 pCi/L (American Lung Association, NH, 2025). The fix is a certified system that pulls the gas out from under your slab and vents it up over the roof. Most jobs land between $1,950 and $2,250, with a full range of $900 to $6,000. A radon test is $50, credited toward the job if you go ahead. Free inspection, quote in 24 hours.

Branden runs our radon work. The crew calls him B-Radon. He has been beating this gas back since 2015. If you own a home in Raymond, give us ten minutes.

What is radon, and why does Raymond care?

Radon is invisible and it has no smell. It comes up out of the ground as uranium in the soil and bedrock breaks down. You can’t see it or smell it. It finds its way in through cracks in the slab, gaps around pipes, sump pits, and dirt crawl-space floors, then it builds up in the lowest level you live in.

Now the Raymond part. We’re the Granite State for a reason, and that granite bedrock is a classic radon source. The USGS and NH DHHS both tie the state’s high radon to its granite geology, and the southeast corner of the state shows the highest share of homes with elevated levels (NH DHHS, Tracking Radon). Raymond sits right in that belt, on the granite under all of Rockingham County.

There’s a second way in that a lot of pages skip. Most of Raymond is on private bedrock wells, not town water, and radon dissolves into groundwater the same way it builds up in air. A USGS study found that more than half of New Hampshire’s groundwater has a 50% or higher chance of elevated radon (Secondwind, citing NH DHHS / USGS). So in a town like Raymond, it’s worth checking the air and, if you’re on a well, the water too.

Why radon is worth fixing

Radon is the second leading cause of lung cancer in the country, behind smoking. That’s the EPA’s finding, not ours, and it’s why New Hampshire tells every home to test no matter what zone it’s in. We’re not trying to scare you. We’re telling you because the fix is simple and it lasts. Test first. If your number comes back at or above 4 pCi/L, fix it.

Radon levels in Raymond, NH: the honest version

A lot of pages get the zone wrong, so here’s the straight version. Rockingham County, which includes Raymond, is EPA Radon Zone 2 (moderate), with a predicted average of 2 to 4 pCi/L (EPA Map of Radon Zones, New Hampshire). It’s not Zone 1. In New Hampshire only Carroll County is Zone 1. Anyone telling you Raymond is a “high-risk Zone 1” town is reading the map wrong.

But the zone doesn’t tell you everything. NH homes test high all the time, Zone 2 or not. Statewide, over 35% of homes tested come back at or above the 4 pCi/L action level (American Lung Association, NH, 2025), versus roughly 1 in 15 homes nationally. Rockingham is one of the highest-reading counties in the state, with communities where more than half of tested homes came back elevated (NH DHHS, Tracking Radon). So the rule here is simple. Test every home, zone or no zone. The only way to know your Raymond home’s number is to test it. A $50 test settles it.

Testing for radon

Testing is cheap and quick. We charge $50 for a radon test, and that $50 comes off the job if you decide to go ahead. A short-term test sits in your lowest lived-in level for a couple of days. A long-term test gives you a fuller picture. If the result lands at or above 4 pCi/L, you mitigate. If it comes back low, great. You’ve got your answer and you don’t need us yet.

If you’re on a private well in Raymond, which most of the town is, radon can show up in your water too. NH DES says to treat well water for radon when the air level in the home is over 4 pCi/L and the water tests at or above 2,000 pCi/L (Secondwind, citing NH DES). We’ll tell you if that’s worth looking into.

How radon mitigation works

The standard fix is sub-slab depressurization. We seal the obvious entry points, then run a vent pipe through the slab and add a quiet inline fan. The fan pulls the radon out from under the foundation and pushes it up and out over the roofline, where it scatters off into the air. A small monitor on the pipe shows the system is doing its job. Most homes are done in a day.

Raymond has its share of older homes, and homes from back then often sit on a dirt-floor or fieldstone crawl space. About 1 in 10 Raymond homes was built before 1940 (Census ACS 2024 5-year, table B25034). For those we install sub-membrane depressurization. That’s a sealed membrane over the crawl-space floor with the same suction running underneath. We do both.

This is a radon mitigation system. It’s not our Forever Dry System, which is the basement waterproofing product. Different problem, different fix. If you’ve got water and radon both, we sort out the order on the inspection.

Cost of radon mitigation in Raymond

Here are our real prices, the same ones we quote anyone in NH.

Service	Price
Radon mitigation system	$900 – $6,000 (most homes land $1,950 – $2,250)
Radon test	$50 (credited toward the job if you proceed)

What moves the price is the home, not the town. A walk-out basement with an easy run for the vent pipe sits at the low end. A multi-zone home, a finished basement, or a fieldstone crawl space that needs a sealed membrane runs higher. We give you the number after we see it, and the quote comes within 24 hours. No surprises on install day.

Radon work carries a 10-year warranty on the system and its parts. We don’t guarantee a specific radon level unless it’s in writing, because the gas is the ground’s, not ours. But we stand behind the system that controls it.

Raymond: local context

Everything here is specific to Raymond, with the source named inline.

• County and zone. Raymond is in Rockingham County, classified EPA Radon Zone 2 (moderate, 2 to 4 pCi/L predicted), not Zone 1 (EPA Map of Radon Zones, New Hampshire). In NH only Carroll County is Zone 1.
• Why test anyway. Statewide, over 35% of NH homes tested are at or above 4 pCi/L (American Lung Association, NH, 2025), versus roughly 1 in 15 nationally, and Rockingham is among the highest-radon counties, with towns where more than half of tested homes came back elevated (NH DHHS, Tracking Radon).
• The geology. NH’s granite bedrock is the source, and Raymond sits on it (USGS / NH DHHS, geology overview). Homes here pull radon up through slab cracks, sump pits, and dirt crawl-space floors.
• The well-water pathway. Most of Raymond is on private bedrock wells. A USGS study found more than half of NH groundwater has a 50% or higher chance of elevated radon, so radon in well water is a second way in for towns like Raymond (Secondwind, citing NH DHHS / USGS). NH DES says to treat well water when the air level is over 4 pCi/L and the water tests at or above 2,000 pCi/L.
• Housing stock. About 1 in 10 Raymond homes was built before 1940, and the median home dates to about 1983 (Census ACS 2024 5-year, Raymond town). Older homes more often sit on a fieldstone or dirt-floor crawl space that needs a sub-membrane system, not a simple slab fix. That’s common for homes of that age, not a measured count for any one street.
• Action level. EPA says to fix a home at 4 pCi/L or higher (EPA Map of Radon Zones, New Hampshire).
• Permits and office. Radon work that ties into your home goes through the Town of Raymond Building Department, 4 Epping Street, Raymond, NH 03077 (Town of Raymond).
• Credentials. We’re a state-certified radon mitigation contractor (cert RMS-113966), licensed and insured, serving southern NH. Branden, who runs our radon work, has been at it since 2015.

What a recent customer said

603 Basement Solutions has a great team to work with. All involved are professional and courteous. The Radon Mitigation quote I received was the final price. I understand unseen problems occur, but I was fortunate. They estimated my radon levels would drop to around 2 but my monitor is reading a 7 day average of .4, WELL below what I was promised and even expected. Highly recommend 603 Basement Solutions.

Jeff Eddy, ★★★★★ Google review

In Raymond, NH, 603 also handles basement waterproofing, basement finishing, crawl space encapsulation, foundation crack repair. Compare costs: helical piers, sill-beam replacement, lally columns.