Radon Mitigation & Testing in Lockport
Platted in 1837 as headquarters of the I&M Canal, Lockport keeps one of the best-preserved limestone downtowns in canal country — surrounded by subdivisions young enough that the town's median home dates to 1998. Two housing stocks, two radon playbooks, one licensed fix.
The canal-town core: stone above, soil gas below
Lockport's historic district — the canal commissioners' town, with landmarks like the 1838 Gaylord Building — is built of the same dolomite limestone the canal crews cut from the Des Plaines valley. The town is even named for the canal's Lock No. 1, whose remains still sit in town — older than any foundation we'll ever route a pipe around. Those walls have stood for nearly two centuries; what they were never designed to stop is soil gas. Rubble-jointed limestone foundations, stone-walled cellars, and partial crawl spaces give radon more entry area than any modern foundation, and the fix often pairs a sub-slab suction point with a sealed crawl membrane. The same dolomite runs under the whole valley — see why this bedrock drives the area's radon numbers. Installers who work these houses route pipe to keep street-facing facades clean — the district earned its preservation, and a radon stack shouldn't cost it.
The other Lockport: subdivisions on a 1998 median
Most of today's Lockport isn't historic at all. The city's median home was built in 1998, and ownership runs deep — 84.6% owner-occupied with a median household income around $112,000 and median home values near $316,000. Those 1990s and 2000s two-stories share Shorewood's problem: modern tight construction, full basements, built before the June 2013 radon-resistant construction requirement. They're also the easy install — one suction point, one day, typically $1,200–$1,700 through the city's Building Department permit process.
Don't let the label pick for you
Will County's EPA "Zone 2" tag suggests moderate readings; the American Lung Association's analysis of Illinois Emergency Management Agency testing data shows more than 40% of tested homes statewide at or above the 4.0 pCi/L action level, and the statewide average of 5.1 clears the action level on its own. A canal-era cellar and a 2005 basement two miles apart can post nearly identical high numbers off the same glacial soil. An $8 county kit from the Will County Health Department answers the only question that matters: what does your house read?
We run the same two playbooks — old foundation, new subdivision — in the rest of Will County too: see how it plays out in Crest Hill, Plainfield, and Shorewood.
Stone cellar or new build — Lockport tests the same.
Call (815) 348-6800Frequently asked questions
My house is in Lockport's historic district — can a radon system go in without ruining the look?
Yes — it's routine for installers working these blocks. The pipe runs through a closet chase or an inconspicuous exterior wall rather than across a street-facing limestone facade, and the fan itself is no louder than a bathroom vent. Because rubble-jointed limestone foundations and stone cellars give radon more entry points than a modern poured slab, the job often pairs a sub-slab suction point with a sealed crawl membrane rather than a single simple hole — more scope, same one-day install, facade untouched.
Why would a stone cellar that's stood for nearly 200 years suddenly have a radon problem?
It's not sudden — the cellar was never sealed against soil gas in the first place, radon just wasn't measured until recently. Rubble-jointed limestone foundations and dirt-floor sections give radon far more surface area to enter through than a single poured slab does, which is why these historic-core homes often need more than one entry point addressed. The stone itself isn't the source — it's glacially deposited soil under the whole town — but it does make the fix a bit more involved than a standard suburban install.
I live in one of the newer subdivisions outside downtown Lockport — is my risk lower than the historic core?
No, and that surprises people. Radon comes from uranium traces in glacial soil that runs under the entire city, not from the age or material of a foundation, so a 2005 two-story two miles from downtown can post the same high number as a canal-era cellar. What differs is the fix: your newer home likely has one clean suction point and a full basement to route through, which actually makes it the simpler, cheaper install of the two.
Who handles radon system permits in Lockport?
The city's Building Department, which sits within Community & Economic Development, issues the permit whether the address is a limestone rowhouse downtown or a 1998-built two-story out toward the newer subdivisions. It's routine paperwork — the kind every Will County town requires for this work — and the licensed contractor we send folds it into the job timeline and the quote, so it's one call, not a separate errand for you.