Radon Testing in Great Falls: The Only Way to Know
You cannot see, smell, or taste radon. The only way to know what's in your home's air is to measure it. That's not a sales line — it's the EPA's and the U.S. Surgeon General's standing recommendation: test every home below the third floor. In Cascade County, where the health department reports 60 percent of collected samples above the 4.0 pCi/L action level, testing isn't a formality. It's a coin flip weighted against you, and the only way to call it is to flip it.
Short-Term vs. Long-Term Radon Testing
A short-term test runs 48 hours to a few days under closed-house conditions — windows and doors shut except normal entry and exit, starting at least 12 hours before the test. It's the standard for real-estate transactions and for a fast first answer. A long-term test runs 90 days or more and averages out the weather, the seasons, and your furnace cycles — the truest picture of what you actually breathe. A sensible pattern for a Great Falls homeowner: short-term first; if it's borderline, follow with a long-term test before deciding.
The Cheap Option First: Montana's Test Kit Programs
Here's the honest part most radon companies skip: you don't have to pay a professional to get a first number. Montana DEQ sells discounted radon test kits through its Radon Control Program — the program the Legislature created back in 1993 — and it discounts them further every January for National Radon Action Month. Closer to home, the Cascade City-County Health Department sells long-term test kits that track your average across three to twelve months. Either is a real answer for the price of a large pizza.
So when should you pay for professional radon testing instead?
- A real-estate deal is on the line. Buyers, sellers, and lenders need a defensible result from a calibrated device on a 48-hour turnaround — not a mailed-in packet with a two-week lab queue. More on radon and closings →
- You need the answer fast. Continuous radon monitors report hour-by-hour and produce a printed report the moment the test window closes.
- You just had a mitigation system installed. Post-mitigation verification is how you know the system actually worked — we include it with every install.
- The first result was confusing. A 3.8 next to a neighbor's 15 deserves a properly placed, properly documented retest before you spend or shrug.
Testing in a Real House, with a Real Family in It
Closed-house conditions don't mean you move out. Live normally — come and go through the doors, run the furnace as usual. Just don't air the place out, skip the window fans, and hold off on the whole-house ventilation until the test is done. In a Great Falls winter, closed-house conditions are simply called winter — the city logs about 7,700 heating degree days a year, and monthly average temperatures stay below 45°F from November through April. That's why heating season is the best time to get a realistic worst-case number.
What Happens if the Number Is High
Nothing dramatic — but don't file it away either. Radon risk is a function of concentration and time, and the fix is well understood: an active sub-slab depressurization system, installed in an afternoon, verified by a follow-up test. Bring us the result and we'll give you a firm written price and an honest read on whether your house needs a system at all. See what mitigation costs in Great Falls →