Radon Testing in Savoy, IL
Radon testing and mitigation in Savoy, IL, for newer subdivision homes, slab-on-grade construction, and passive radon stacks that were never tested.
Savoy is the town where we most often walk into a house that already has most of a radon system in it. Illinois has required passive radon-resistant features in new residential construction since 2013, so a large share of the homes built here in the last decade have gravel under the slab, a vapor barrier, and a capped PVC stack running from beneath the floor up through the house. What almost none of them have is a test result proving that setup is doing its job.
That is the whole Savoy conversation. Buyers see the pipe, assume the house is handled, and move in. The pipe is not a result. A passive stack relies on the natural stack effect of the building to pull soil gas up and out, and whether that is enough depends on the soil, the size of the slab, and how tightly the house was built. Some Savoy homes are genuinely fine on passive alone. Others are not, and only a test separates them.
The good news is that the expensive part is already done. When a newer Savoy home tests high, activating it usually means adding an inline fan to the existing stack in the attic and wiring it, not coring a finished floor and running new pipe through somebody's closet.
Serving all of Savoy, IL and the surrounding Champaign area.
Savoy sits immediately south of Champaign along US 45 and around the University of Illinois Willard Airport, and most of its housing went up in subdivisions built on former farm ground within the last few decades. That means slab-on-grade homes, newer basements, and a large number of houses built with passive radon piping already in the walls, which almost nobody has tested to find out whether the passive design was actually enough.
Passive stacks in newer Savoy subdivisions tested before anyone is sold a system
Fan activation on an existing radon stub, done without opening finished walls
Slab-on-grade homes handled with suction points placed off the plumbing layout
Fast turnaround for closings on the relocation timelines this area runs on
The Pipe Nobody Turned On
A passive system is a mitigation system missing its fan. In a Savoy home that usually looks like a white PVC pipe in a mechanical room or a closet, running up and out through the roof, with no manometer and no hum. Because it looks finished, it gets treated as finished, and years go by without anyone putting a monitor on the lowest level to see what the house is actually holding.
Testing settles it in a couple of days. If the number is low, you have documentation and you spend nothing. If it is at or above 4.0 pCi/L, activation is a short job on a house like this, because the suction point was placed correctly in clean aggregate during the pour and the pipe route already exists. Retesting after the fan goes in confirms it worked, which is the part people skip and should not.
- •A capped stack in the mechanical room is not a passing test
- •Activation on an existing stub avoids coring and interior pipe runs
- •Retest after the fan runs so you have a number, not an assumption
Slab-on-Grade Homes Are Not Exempt
A recurring assumption in the newer parts of Savoy is that a house with no basement has no radon problem. It is not true. Soil gas enters through the slab the same way it enters a basement floor, at the perimeter joint, at control joints, and around plumbing penetrations, and in a slab home the lowest lived-in level is where you sleep rather than where you store holiday decorations. The exposure is arguably more direct, not less.
Mitigating a slab home takes a slightly different approach. There is no basement to hide pipe in, so the suction point and the route matter aesthetically as well as technically, and we plan around the plumbing and the garage rather than defaulting to whatever wall is closest. Where the slab is large or was poured in sections, one suction point may not reach everything, which we test for rather than assume.
Frequently Asked Questions
My Savoy house was built radon-ready. Do I still need a test?
Yes, and it is the most common thing we tell people in this town. Radon-ready means the builder installed the passive components required by Illinois law for new residential construction. It does not mean the finished house was measured. Passive works in plenty of homes and falls short in others depending on soil and how tight the build is. A short-term test is cheap and it is the only thing that answers the question.
How much work is it to add a fan to my existing radon pipe?
Far less than a retrofit. The hard parts, breaking the slab and routing pipe up through the structure, were done during construction. Activation is splicing an inline radon fan into that stack, usually in the attic where it belongs, and running power to it. Most of these are a short single visit, followed by a retest to confirm the level actually dropped.
I have a slab, no basement. Where does the system even go?
Into the slab. We core a hole through the floor, usually in a garage, utility area, or closet, pull the material out beneath it to create a suction pit, and run pipe from there to a fan and out above the roofline. Placement is a design decision on a slab home because there is nowhere to hide the pipe, so we walk the route with you before anything gets cut.
We are closing on a Savoy house in two weeks. Is there time?
Usually, but it is tight and it depends on when testing starts. A valid short-term test needs a minimum 48-hour closed-house period, then you need room to negotiate and, if it comes to it, to install. We work backward from your closing date and tell you honestly whether the schedule holds instead of finding out on the last day.
Get a Fast, Free Estimate
Tell us what happened and where. We respond quickly, and emergencies get priority around the clock.