Advanced Radon Mitigation, LLC
(618) 910-2034✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
Radon in ZIP code 61603
Last updated
ZIP 61603 lies entirely in Peoria County, Illinois. EPA’s radon zone for this area: Zone 1, highest potential.
Zone 1 Peoria County, IL · 100% of the ZIP’s land area
Predicted average indoor screening level above 4 pCi/L.
What this means for homes in 61603
EPA built its zone map county by county in 1993, so every address in 61603 shares Peoria 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.
Next: read how to test your home, then check the number with the level calculator.
Radon professionals for 61603
These professionals are listed for Peoria County that 61603 falls in. Featured listings are paid placements and are labelled.
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.
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.
JW Summy Contracting
(309) 525-1744✓ Verified October 4, 2026 on the official state list dated October 4, 2026, double-checked against a second state list.
MidAmerica Basement Systems
(800) 541-8006✓ 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.
See all 80 on the Peoria County page →
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Nearby ZIP codes in Peoria 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 61603?
ZIP 61603 lies in Peoria County, which EPA places in Zone 1 (highest potential).
Should I test for radon in 61603?
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 61603?
This page lists 80 professionals for the county that 61603 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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