Babb's Service Company
(309) 829-9455✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radon in Douglas County, Illinois
Last updated
Zone 1 Highest potential. Predicted average indoor screening level above 4 pCi/L.
Douglas County is one of 56 Illinois counties (out of 102) that EPA places in Zone 1. 13 ZIP codes reach into the county, 3 of them entirely. We list 57 radon professionals for Douglas County, each checked against the state’s official list.
What the zone means for a Douglas County home
Zone 1 means EPA predicted an average indoor screening level above 4 pCi/L for Douglas County as a whole, the level at which EPA says to fix a home. High readings are common here, so a test is especially worthwhile, and new homes in Douglas County are good candidates for radon-resistant construction.
A short-term test kit costs little and takes two to seven days. If your result is 4 pCi/L or higher, EPA recommends a follow-up test and, if it is confirmed, a mitigation system, which typically uses a pipe and fan to pull soil gas from under the foundation and vent it above the roof. Check a result with the level calculator and plan your next step with the follow-up planner.
Radon professionals for Douglas County
Illinois listings show the counties each licensee told IEMA they serve. Listings are free. Featured listings are paid placements and are labelled.
Central Illinois Radon Mitigation
(217) 520-6630✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
David Smith Radon Remedies, Inc.
(309) 777-3910✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Doug Stuedemann Radon Mitigation
(815) 474-3940✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
DuPage Radon Contractors
(630) 836-1918✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Iconradon
(309) 445-4183✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Illinois Valley Radon Mitigation, LLC
(815) 313-5892✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Inspect It Chicago
(630) 890-8634✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
MidAmerica Basement Systems
(563) 381-1700✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Midwest Radon Services, Inc.
(708) 680-6080✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radon Defenders
(269) 446-0558✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radon Gone LLC
(847) 668-5313✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radon Mitigation Corporation
(217) 841-7311✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radon Professional Services
(708) 935-3206✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radon Remedy
(262) 577-5515✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radon Services
(217) 483-5198✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radon Solutions, LLC
(563) 386-8686✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radon Specialist
(217) 259-1504✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Swat Environmental
(262) 293-9180✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
SWAT Environmental
(262) 754-2211✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
SWAT Environmental
(920) 740-3041✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
SWAT Environmental
(414) 731-6215✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
SWAT Environmental
(844) 331-6440✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
A to Z Radon Inspectors
(708) 785-8855✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
AAS Radon Testing
(224) 440-2455✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Arc-1 Radon Detection
(618) 606-5542✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Brickkicker Inc
(800) 821-1820✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Callaway & Associates, Inc
(217) 599-1209✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Carmen Mihaileanu
(312) 804-3618✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Carnow Conibear
(312) 782-4486✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Checkpoint Inspections LLC
(708) 567-3512✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Chicago Radon Testing, Inc.
(312) 925-9996✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Consulting Solutions Inc.
(847) 690-0905✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Dhanendra Sharma
(224) 432-7967✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Discover LLC
(866) 750-3456✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Eagle Eye Home and Property Inspections LLC
(847) 531-0530✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Ecosense
(408) 634-2955✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Extra Mile Inspection
(847) 561-8232✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Gallagher Bassett Services, Inc, WCD Group Division
(773) 750-6419✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Gill Group
(800) 428-3320✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Hassan Adams
(872) 203-3445✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Home Raters, Inc.
(847) 433-3450✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
HouseMaster
(618) 977-7434✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
ILLIANA Home Inspection, LLC
(217) 853-3467✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Libra Inspections LLC
(217) 402-8393✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Optimal Home Inspections, LLC
(773) 710-5891✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Platinum Radon Detectives
(847) 708-1368✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Pristine Inspections & Testing, Inc.
(217) 352-3743✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Property Guidance Inspection LLC
(773) 469-3390✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Quality Assurance Radon Testing, Inc.
(630) 973-9840✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radalink, Inc.
(770) 457-1944✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radon Diagnostics, Inc.
(847) 312-6538✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radon Tec
(312) 246-2756✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Stacy Gee
(217) 273-0267✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Stro's Radon LLC
(815) 751-5273✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Tri-County Radon Measurement
(708) 429-0436✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
WIN Home Inspection
(618) 534-3526✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
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ZIP codes in Douglas County
Open a ZIP to see every county it touches. Where a ZIP crosses a county line, the percentage is the share of its land area inside Douglas County.
61852 (21%)61872 (10%)61910 (67%)61911 (41%)61913 (48%)61917 (6%)6191961930 (76%)6194161942 (91%)61943 (34%)6195361956 (77%)
Illinois radon program
EPA lists IL Emergency Management Agency Radon Program (phone 217-782-4977) as the state contact. State programs can tell you about local test results, discounted kits, disclosure rules for home sales and credentialed professionals. Website: iema.illinois.gov/nrs/radon.html.
Back to all Illinois counties.
Frequently asked questions
What is the EPA radon zone for Douglas County, Illinois?
EPA's Map of Radon Zones puts Douglas County in Zone 1 (highest potential): Predicted average indoor screening level above 4 pCi/L.
Do I need to test for radon in Douglas County if the zone is low?
Yes. EPA says the zone map should not be used to decide whether a single home needs testing. Homes with high radon are found in every zone, and neighboring homes can test very differently. Testing is cheap and the only way to know your level.
How do I find a certified radon professional in Douglas County?
We list 57 state-licensed radon professionals for Douglas County on this page, each checked against the state's official list. You can also ask for free quotes with the form on this page.
How many ZIP codes are in Douglas County?
13 ZIP codes have at least part of their land area in Douglas County, based on the U.S. Census Bureau's 2020 ZIP Code Tabulation Area to county relationship file.
Free checklist · PDF
Radon Test Checklist
A one-page, step-by-step checklist for running a home radon test right the first time, and what to do with the number.
- Short-term vs. long-term test: which to use
- Closed-house conditions and where to place the kit
- What 2, 4 and 8 pCi/L mean and when to fix
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