Question 1

Why is radon so high in Rochester compared to other parts of Minnesota?

Accepted Answer

Two big reasons. The first is the rock under your basement. A layer of soft limestone runs close to the surface across Olmsted County, and it is full of small cracks. Radon gas moves up through those cracks and into the soil under your slab. The second reason is the Minnesota winter. When your furnace runs, warm air rises and escapes out the top of the house. That pulls air, including radon, up through the basement floor. Both effects work together for six months of the year, which is why local testing puts about half of Olmsted County homes above the EPA action level.

Question 2

My test came back above the EPA action level. Is that a real problem?

Accepted Answer

The EPA recommends taking action when a long-term result lands above 4 pCi/L. The World Health Organization sets its line a little lower. A result above either of those is worth a conversation, and it is normal territory for a Rochester home rather than an emergency. The right next step depends on your home, the foundation, and the rest of the picture. Give us a call and we can walk through what your result means for your situation.

Question 3

My new house already has a radon pipe in it. Do I still need to do anything?

Accepted Answer

Most likely, yes. Minnesota has required a basic radon prep in every new home since 2009. That means a pipe that runs from below the basement floor up through the roof, plus a sealed plastic layer under the slab. On its own, that prep is rarely enough to bring a Minnesota home under the action level. A lot of those homes still test above 4 pCi/L once people move in. The right next step is a conversation about your specific home. It is the most common starting point we hear from Byron, Pine Island, Bamber Valley, and the newer parts of Rochester.

Question 4

Should I test in winter or in summer?

Accepted Answer

Winter is the more honest test. The house is sealed up, the furnace is running, and indoor radon is at its highest. Both the Minnesota Department of Health and Olmsted County Public Health recommend testing in the cold months for that reason. For a real estate sale, the rules are the same year-round. Windows and outside doors stay closed except for normal use for at least 12 hours before the test starts and during the test.

Question 5

My realtor says I need a radon test before closing. How does that work?

Accepted Answer

Real estate timelines are something we hear about often. Call us and tell us where you are in the process, and we can talk through what your situation looks like and how the conversation might fit your closing calendar. Minnesota law requires sellers to share any radon results and any past mitigation in writing before the purchase agreement is signed. We are familiar with what those rules ask for.

Question 6

Will the system make my basement cold or noisy?

Accepted Answer

A radon system is built to run quietly in the background. From inside the basement you will hear it less than you hear your refrigerator. When the fan sits outside the house, you usually hear nothing at all from inside. The electrical draw is small, similar to a light bulb running all day.

Question 7

Do I need to test again after the system goes in?

Accepted Answer

Yes. The Minnesota Department of Health and the EPA both recommend a follow-up test after install. After that, periodic testing keeps an eye on how the system is doing. A gauge on the wall confirms the fan is running, but it does not replace an actual air measurement.

Question 8

The previous owner already had a system put in. Why is my house still over 4 pCi/L?

Accepted Answer

A few things can cause this. The fan may have aged out and quietly stopped doing its job. The system may not be a great fit for the foundation. Or there may be a path under the home that needs more attention than the original install gave it. A diagnostic visit is the right starting point. We check the existing setup, look at what is going on under the slab, and talk through what the picture actually is. From there we can have a real conversation about next steps.

Question 9

My basement has a sump pit. Does that make this harder?

Accepted Answer

Usually it makes the picture easier rather than harder. The sump pit can be worked into the plan in a way that lets the pump keep doing its job. The exact approach depends on what your basement looks like in person.

Question 10

What about my crawl space?

Accepted Answer

A crawl space is its own kind of conversation. The foundation behaves differently than a full basement does, and the right approach depends on what your crawl space is actually doing. We work crawl-space homes in the older rural areas around Stewartville, Oronoco, and Chatfield and we are happy to talk through yours. A common side benefit is that the crawl space tends to dry out as part of the work. That is not the main goal, but it is a nice piece of the result.

Question 11

Will the system also help with basement moisture?

Accepted Answer

Often, yes, as a side benefit. Pulling air from under the slab tends to pull out humid soil air with it, which lowers basement moisture. We are honest about this though. The system is built for radon, not for waterproofing. If you have standing water or active leaks, that is a separate fix.

Question 12

My neighbor tested low. Are we just unlucky?

Accepted Answer

Radon levels can vary a lot from one house to the next, even between neighbors with similar floor plans. It depends on slab condition, foundation type, how the home was sealed, and what the rock under the house is doing. Your neighbor's number tells you almost nothing about yours.

Question 13

Is the system safe to leave running all year?

Accepted Answer

Yes. These systems are designed to run continuously. The power use is small, the vent is sealed, and the system needs to run year-round to keep radon under the action level. The only routine task is a quick glance at the gauge once in a while.

Radon Questions for Rochester Homeowners

Whether to test, when to test, and what your radon level actually means.