Home and property - Front Range
Radon and expansive soils are normal home questions in Broomfield
Like much of the Front Range, Broomfield sits on ground where radon gas and swelling clay soils are common things to test for when buying or building a home.
Published June 10, 2026 - Last verified June 10, 2026
Two things come up again and again for Front Range homes, and Broomfield is squarely in that belt: radon gas and expansive soils. Neither should scare you off. Both are just normal things to check.
Radon is a natural gas that seeps up from the ground and can build up inside a house. The Colorado Geological Survey notes that radon is found across the state and that about half of Colorado homes show levels worth addressing. You cannot see or smell it, so the only way to know is a test. If a level is high, systems exist to vent it, and that is routine work here.
Expansive soils are the other one. Much of the Front Range, including the piedmont where Broomfield sits, has clay-rich soil and bedrock that swell when wet and shrink when dry. Over time that movement can crack foundations, flatwork, and driveways if a home was not built and drained for it. Good grading, downspouts that carry water away, and steady soil moisture all help.
Neither issue is unique to Broomfield, and neither is a reason to panic. They are simply part of owning a home on this ground. For plain-language explanations of both, the Colorado Geological Survey is the place to start, and a radon test plus a soils-aware inspection covers most of the worry.