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.
Radon in ZIP code 61943
Last updated
ZIP 61943 crosses 3 county lines. Most of its land (57.9%) is in Coles County, Illinois. EPA’s radon zone for this area: Zone 1, highest potential.
Zone 1 Coles County, IL · 57.9% of the ZIP’s land area
Predicted average indoor screening level above 4 pCi/L.
Zone 1 Douglas County, IL · 34.2% of the ZIP’s land area
Predicted average indoor screening level above 4 pCi/L.
Zone 1 Edgar County, IL · 7.9% of the ZIP’s land area
Predicted average indoor screening level above 4 pCi/L.
What this means for homes in 61943
EPA built its zone map county by county in 1993, so every address in each part of 61943 shares its county’s prediction. The zone is a starting point, not a measurement of your house. Zone 1 areas like this one have a high share of homes above 4 pCi/L, so testing is a priority.
Because 61943 crosses county lines, your county depends on your street. Your property tax bill or county assessor site shows which county you are in. Next: read how to test your home, then check the number with the level calculator.
Radon professionals for 61943
These professionals are listed for the counties that 61943 falls in. Featured listings are paid placements and are labelled.
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.
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.
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.
See all 61 on the Coles County page →
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Nearby ZIP codes in Coles County
Illinois radon help
IL Emergency Management Agency Radon Program (217-782-4977) can help with test kits, local data and credentialed professionals: iema.illinois.gov/nrs/radon.html.
Frequently asked questions
What is the radon zone for ZIP code 61943?
ZIP 61943 spans 3 counties. The highest-potential zone among them is Zone 1 (highest potential). Coles County: Zone 1 (57.9% of the ZIP's land); Douglas County: Zone 1 (34.2% of the ZIP's land); Edgar County: Zone 1 (7.9% of the ZIP's land).
Should I test for radon in 61943?
Yes. EPA recommends testing every home regardless of zone, because radon varies from house to house. Fix the home if a confirmed result is 4 pCi/L or higher, and consider fixing between 2 and 4 pCi/L.
Are there certified radon professionals near 61943?
This page lists 61 professionals for the counties that 61943 falls in, each checked against the state's official certification or licence list.
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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