2026 Rankings

EPA Radon Zone 1 ZIP Codes in Illinois - 2026

Last updated: October 15, 2026

797 ZIP codes ranked by Radon Zone #1: ZIP 61523 (Chillicothe, IL) - Zone 1 (highest potential)
Lead Violations Lowest Score Safest Flood Risk Energy Cost Radon PFAS Reliability EJ Index Homebuyer Risk CO & Gas Safest Gas Remediation Burden Unresolved Violations (by Utility) Water Equity (by Utility)

Out of 797 ZIP codes with data in Illinois, these are mapped to counties in EPA Radon Zone 1. See also: National ZIP Codes in EPA Radon Zone 1 | All Illinois Rankings

Statistic Value
ZIP codes ranked 797
Lowest value Zone 1 (highest potential)
Median value Zone 1 (highest potential)
State Illinois

ZIP Codes in EPA Radon Zone 1

Rank ZIP Code City State Radon Zone Safety Score
1 61523 Chillicothe IL Zone 1 (highest potential) 39/100
2 60177 South Elgin IL Zone 1 (highest potential) 40/100
3 61604 Peoria IL Zone 1 (highest potential) 44/100
4 61536 Hanna City IL Zone 1 (highest potential) 45/100
5 61547 Mapleton IL Zone 1 (highest potential) 45/100
6 61607 Peoria IL Zone 1 (highest potential) 45/100
7 60119 Elburn IL Zone 1 (highest potential) 46/100
8 61073 Roscoe IL Zone 1 (highest potential) 47/100
9 61615 Peoria IL Zone 1 (highest potential) 47/100
10 61072 Rockton IL Zone 1 (highest potential) 48/100
11 61111 Loves Park IL Zone 1 (highest potential) 48/100
12 61103 Rockford IL Zone 1 (highest potential) 49/100
13 61115 Machesney Park IL Zone 1 (highest potential) 49/100
14 61244 East Moline IL Zone 1 (highest potential) 50/100
15 61265 Moline IL Zone 1 (highest potential) 50/100
16 61282 Silvis IL Zone 1 (highest potential) 50/100
17 61525 Dunlap IL Zone 1 (highest potential) 50/100
18 61526 Edelstein IL Zone 1 (highest potential) 50/100
19 61528 Edwards IL Zone 1 (highest potential) 50/100
20 61552 Mossville IL Zone 1 (highest potential) 50/100
21 61602 Peoria IL Zone 1 (highest potential) 50/100
22 61603 Peoria IL Zone 1 (highest potential) 50/100
23 61606 Peoria IL Zone 1 (highest potential) 50/100
24 61614 Peoria IL Zone 1 (highest potential) 50/100
25 61616 Peoria Heights IL Zone 1 (highest potential) 50/100
26 61625 Peoria IL Zone 1 (highest potential) 50/100
27 61704 Bloomington IL Zone 1 (highest potential) 50/100
28 61705 Bloomington IL Zone 1 (highest potential) 50/100
29 62712 Springfield IL Zone 1 (highest potential) 50/100
30 61264 Milan IL Zone 1 (highest potential) 52/100
31 60124 Elgin IL Zone 1 (highest potential) 53/100
32 62563 Rochester IL Zone 1 (highest potential) 53/100
33 60175 Saint Charles IL Zone 1 (highest potential) 54/100
34 60140 Hampshire IL Zone 1 (highest potential) 55/100
35 61240 Coal Valley IL Zone 1 (highest potential) 56/100
36 61701 Bloomington IL Zone 1 (highest potential) 57/100
37 60136 Gilberts IL Zone 1 (highest potential) 58/100
38 61752 Le Roy IL Zone 1 (highest potential) 58/100
39 62707 Springfield IL Zone 1 (highest potential) 58/100
40 60123 Elgin IL Zone 1 (highest potential) 59/100
41 60174 Saint Charles IL Zone 1 (highest potential) 59/100
42 61109 Rockford IL Zone 1 (highest potential) 59/100
43 61016 Cherry Valley IL Zone 1 (highest potential) 60/100
44 62521 Decatur IL Zone 1 (highest potential) 60/100
45 62549 Mt Zion IL Zone 1 (highest potential) 60/100
46 61102 Rockford IL Zone 1 (highest potential) 61/100
47 61108 Rockford IL Zone 1 (highest potential) 61/100
48 61112 Rockford IL Zone 1 (highest potential) 61/100
49 61802 Urbana IL Zone 1 (highest potential) 61/100
50 61925 Dalton City IL Zone 1 (highest potential) 61/100
51 61201 Rock Island IL Zone 1 (highest potential) 62/100
52 61822 Champaign IL Zone 1 (highest potential) 62/100
53 61874 Savoy IL Zone 1 (highest potential) 62/100
54 62704 Springfield IL Zone 1 (highest potential) 62/100
55 62711 Springfield IL Zone 1 (highest potential) 62/100
56 60510 Batavia IL Zone 1 (highest potential) 63/100
57 61036 Galena IL Zone 1 (highest potential) 63/100
58 61801 Urbana IL Zone 1 (highest potential) 63/100
59 60134 Geneva IL Zone 1 (highest potential) 64/100
60 60505 Aurora IL Zone 1 (highest potential) 64/100
61 61284 Taylor Ridge IL Zone 1 (highest potential) 64/100
62 61820 Champaign IL Zone 1 (highest potential) 64/100
63 62052 Jerseyville IL Zone 1 (highest potential) 64/100
64 62301 Quincy IL Zone 1 (highest potential) 64/100
65 62305 Quincy IL Zone 1 (highest potential) 64/100
66 62526 Decatur IL Zone 1 (highest potential) 64/100
67 60542 North Aurora IL Zone 1 (highest potential) 65/100
68 60554 Sugar Grove IL Zone 1 (highest potential) 65/100
69 61080 South Beloit IL Zone 1 (highest potential) 65/100
70 61853 Mahomet IL Zone 1 (highest potential) 65/100
71 61863 Pesotum IL Zone 1 (highest potential) 65/100
72 61866 Rantoul IL Zone 1 (highest potential) 65/100
73 61880 Tolono IL Zone 1 (highest potential) 65/100
74 62338 Fowler IL Zone 1 (highest potential) 65/100
75 62360 Payson IL Zone 1 (highest potential) 65/100
76 62522 Decatur IL Zone 1 (highest potential) 65/100
77 62561 Riverton IL Zone 1 (highest potential) 65/100
78 62615 Auburn IL Zone 1 (highest potential) 65/100
79 62684 Sherman IL Zone 1 (highest potential) 65/100
80 62703 Springfield IL Zone 1 (highest potential) 65/100
81 60110 Carpentersville IL Zone 1 (highest potential) 66/100
82 60506 Aurora IL Zone 1 (highest potential) 66/100
83 60538 Montgomery IL Zone 1 (highest potential) 66/100
84 61041 Hanover IL Zone 1 (highest potential) 66/100
85 61101 Rockford IL Zone 1 (highest potential) 66/100
86 61107 Rockford IL Zone 1 (highest potential) 66/100
87 61114 Rockford IL Zone 1 (highest potential) 66/100
88 61761 Normal IL Zone 1 (highest potential) 66/100
89 62022 Dow IL Zone 1 (highest potential) 66/100
90 62031 Fieldon IL Zone 1 (highest potential) 66/100
91 62037 Grafton IL Zone 1 (highest potential) 66/100
92 62320 Camp Point IL Zone 1 (highest potential) 66/100
93 62501 Argenta IL Zone 1 (highest potential) 66/100
94 62523 Decatur IL Zone 1 (highest potential) 66/100

Methodology

This ranking is limited to EPA county-level radon zone classification. Zone 1 is an EPA county-level radon-potential category; it does not measure a home or establish whether any building is above an action level. Within Zone 1, ZIP codes are sub-ranked by Home Safety Score to organize area context.

Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-10-15.

Frequently Asked Questions

What is EPA Radon Zone 1?

Zone 1 is an EPA county-level radon-potential category. It is not a measurement for a home and cannot determine whether a building is above an action level. A home test is required for that decision.

Should I test for radon?

The EPA recommends testing all homes regardless of radon zone. A DIY test kit costs $15-40. Professional testing costs $150-250. If levels exceed 4 pCi/L, mitigation systems ($800-2,500) can reduce radon by up to 99%.

Explore More Rankings

How this ranking is calculated, data sources, and limitations: Rankings Methodology →

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Disclaimer: Rankings are based on EPA, FEMA, and federal agency data. They reflect historical patterns and risk indicators, not necessarily current conditions. For the most current information, contact your local water utility or request a Consumer Confidence Report.

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