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 62912
Last updated
ZIP 62912 crosses 2 county lines. Most of its land (59.3%) is in Johnson County, Illinois. EPA’s radon zone for this area: Zone 2, moderate potential.
Zone 2 Johnson County, IL · 59.3% of the ZIP’s land area
Predicted average indoor screening level from 2 to 4 pCi/L.
Zone 2 Union County, IL · 40.7% of the ZIP’s land area
Predicted average indoor screening level from 2 to 4 pCi/L.
What this means for homes in 62912
EPA built its zone map county by county in 1993, so every address in each part of 62912 shares its county’s prediction. The zone is a starting point, not a measurement of your house. In a Zone 2 area many homes are fine and many are not; only a test tells you which yours is.
Because 62912 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 62912
These professionals are listed for the counties that 62912 falls in. Featured listings are paid placements and are labelled.
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.
MK Radon Specialists
(815) 666-8002✓ 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 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 Reduction Systems, Inc.
(630) 357-9474✓ 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 57 on the Johnson County page →
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Nearby ZIP codes in Johnson 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 62912?
ZIP 62912 spans 2 counties. The highest-potential zone among them is Zone 2 (moderate potential). Johnson County: Zone 2 (59.3% of the ZIP's land); Union County: Zone 2 (40.7% of the ZIP's land).
Should I test for radon in 62912?
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 62912?
This page lists 57 professionals for the counties that 62912 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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