Radon, arsenic and other New Hampshire home checks

Should I test a New Hampshire home for radon?

Yes. NHDES says radon is commonly found in bedrock and in water from bedrock (drilled) wells in New Hampshire, and it recommends that homeowners always test the air in their home. Radon gas moves from bedrock through the soil and enters a home through cracks or other openings in the foundation.

The U.S. EPA strongly recommends treatment when indoor air radon is at or above 4 picocuries per liter (pCi/L). NHDES recommends nationally certified radon measurement providers.

Can radon be in well water too?

Yes. Homes on a drilled well can have radon in the water as well as the air. NHDES recommends at least two water tests before deciding on treatment. For a private well at or above 10,000 pCi/L, it recommends treating the water along with the air; between 2,000 and 10,000 pCi/L, water treatment may be advisable if the home's air is above 4 pCi/L.

How common is arsenic in NH well water?

NHDES says private wells in New Hampshire have about a 25% chance of naturally occurring arsenic above the state standard of 5 parts per billion. Arsenic has no color, taste or odor, so a lab test is the only way to know, and drinking water with arsenic over a lifetime is linked to a higher risk of cancer. NHDES recommends its Standard Analysis from an accredited lab, which includes arsenic.

If a test comes back high, treatment is available. NHDES says a point-of-use system at the kitchen tap is the most cost-effective and simplest solution for most wells, and whole-house systems are another option.

What should I check on a heating oil tank?

If the home heats with oil, look at the tank. NHDES's self-inspection checklist asks whether the tank and lines are free of leaks, whether the tank and supports are free of significant rust, whether there's a working sight gauge and vent whistle, and whether an outdoor tank is protected from ice and snow falling off the roof. NHDES advises having a trained professional fix any problems.

What if the home has a well or septic system?

A home with a private well or septic system has its own checks, including NHDES's well water test for home buyers and the septic approvals and pumping records. The well and septic guide covers them, including the required evaluation for waterfront septic systems.

How do test results affect closing?

Test results take time, and a high result can lead to a negotiation over treatment or a seller credit. Build testing into your inspection period and tell Tom early. Depending on the loan program and what the appraiser finds, a lender may ask for a water test or repairs before closing.

Ask your home inspector which tests they can arrange. Service Connect lists local home pros, including inspectors, as they join.