2026 Rankings

Highest Radon Risk ZIP Codes in Pennsylvania — 2026

Last updated: August 14, 2026

1,596 ZIP codes ranked by Radon Zone #1: ZIP 15108 (Coraopolis, PA) - Zone 1 (High)
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 1,596 ZIP codes with data in Pennsylvania, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All Pennsylvania Rankings

Statistic Value
ZIP codes ranked 1,596
Lowest value Zone 1 (High)
Median value Zone 1 (High)
State Pennsylvania

100 Lowest-Ranked ZIP Codes

Rank ZIP Code City State Radon Zone Safety Score
1 15108 Coraopolis PA Zone 1 (High) 27/100
2 15009 Beaver PA Zone 1 (High) 33/100
3 15059 Midland PA Zone 1 (High) 33/100
4 15061 Monaca PA Zone 1 (High) 33/100
5 15650 Latrobe PA Zone 1 (High) 33/100
6 16823 Bellefonte PA Zone 1 (High) 33/100
7 17013 Carlisle PA Zone 1 (High) 33/100
8 17015 Carlisle PA Zone 1 (High) 33/100
9 17340 Littlestown PA Zone 1 (High) 33/100
10 17702 Williamsport PA Zone 1 (High) 33/100
11 17754 Montoursville PA Zone 1 (High) 33/100
12 18041 East Greenville PA Zone 1 (High) 33/100
13 18049 Emmaus PA Zone 1 (High) 33/100
14 18062 Macungie PA Zone 1 (High) 33/100
15 18070 Palm PA Zone 1 (High) 33/100
16 18076 Red Hill PA Zone 1 (High) 33/100
17 18902 Doylestown PA Zone 1 (High) 33/100
18 18914 Chalfont PA Zone 1 (High) 33/100
19 18938 New Hope PA Zone 1 (High) 33/100
20 18940 Newtown PA Zone 1 (High) 33/100
21 18944 Perkasie PA Zone 1 (High) 33/100
22 18951 Quakertown PA Zone 1 (High) 33/100
23 18954 Richboro PA Zone 1 (High) 33/100
24 18960 Sellersville PA Zone 1 (High) 33/100
25 18966 Southampton PA Zone 1 (High) 33/100
26 18974 Warminster PA Zone 1 (High) 33/100
27 19002 Ambler PA Zone 1 (High) 33/100
28 19025 Dresher PA Zone 1 (High) 33/100
29 19034 Fort Washington PA Zone 1 (High) 33/100
30 19040 Hatboro PA Zone 1 (High) 33/100
31 19044 Horsham PA Zone 1 (High) 33/100
32 19053 Feasterville Trevose PA Zone 1 (High) 33/100
33 19067 Morrisville PA Zone 1 (High) 33/100
34 19090 Willow Grove PA Zone 1 (High) 33/100
35 19317 Chadds Ford PA Zone 1 (High) 33/100
36 19335 Downingtown PA Zone 1 (High) 33/100
37 19344 Honey Brook PA Zone 1 (High) 33/100
38 19348 Kennett Square PA Zone 1 (High) 33/100
39 19380 West Chester PA Zone 1 (High) 33/100
40 19382 West Chester PA Zone 1 (High) 33/100
41 19383 West Chester PA Zone 1 (High) 33/100
42 19403 Norristown PA Zone 1 (High) 33/100
43 19422 Blue Bell PA Zone 1 (High) 33/100
44 19426 Collegeville PA Zone 1 (High) 33/100
45 19454 North Wales PA Zone 1 (High) 33/100
46 19460 Phoenixville PA Zone 1 (High) 33/100
47 17325 Gettysburg PA Zone 1 (High) 34/100
48 17363 Stewartstown PA Zone 1 (High) 34/100
49 15071 Oakdale PA Zone 1 (High) 35/100
50 17545 Manheim PA Zone 1 (High) 35/100
51 18925 Furlong PA Zone 1 (High) 35/100
52 19462 Plymouth Meeting PA Zone 1 (High) 35/100
53 19605 Reading PA Zone 1 (High) 35/100
54 18901 Doylestown PA Zone 1 (High) 36/100
55 18977 Washington Crossing PA Zone 1 (High) 36/100
56 19031 Flourtown PA Zone 1 (High) 36/100
57 17042 Lebanon PA Zone 1 (High) 37/100
58 17543 Lititz PA Zone 1 (High) 37/100
59 19518 Douglassville PA Zone 1 (High) 37/100
60 17315 Dover PA Zone 1 (High) 38/100
61 17361 Shrewsbury PA Zone 1 (High) 38/100
62 18976 Warrington PA Zone 1 (High) 38/100
63 19440 Hatfield PA Zone 1 (High) 38/100
64 15052 Industry PA Zone 1 (High) 39/100
65 15627 Derry PA Zone 1 (High) 39/100
66 17522 Ephrata PA Zone 1 (High) 39/100
67 18912 Buckingham PA Zone 1 (High) 39/100
68 19342 Glen Mills PA Zone 1 (High) 39/100
69 19390 West Grove PA Zone 1 (High) 39/100
70 19401 Norristown PA Zone 1 (High) 39/100
71 19405 Bridgeport PA Zone 1 (High) 39/100
72 19406 King Of Prussia PA Zone 1 (High) 39/100
73 19428 Conshohocken PA Zone 1 (High) 39/100
74 19505 Bechtelsville PA Zone 1 (High) 39/100
75 19604 Reading PA Zone 1 (High) 39/100
76 15010 Beaver Falls PA Zone 1 (High) 40/100
77 15101 Allison Park PA Zone 1 (High) 40/100
78 19001 Abington PA Zone 1 (High) 40/100
79 19003 Ardmore PA Zone 1 (High) 40/100
80 19008 Broomall PA Zone 1 (High) 40/100
81 19013 Chester PA Zone 1 (High) 40/100
82 19014 Aston PA Zone 1 (High) 40/100
83 19015 Brookhaven PA Zone 1 (High) 40/100
84 19017 Chester Heights PA Zone 1 (High) 40/100
85 19022 Crum Lynne PA Zone 1 (High) 40/100
86 19026 Drexel Hill PA Zone 1 (High) 40/100
87 19035 Gladwyne PA Zone 1 (High) 40/100
88 19038 Glenside PA Zone 1 (High) 40/100
89 19041 Haverford PA Zone 1 (High) 40/100
90 19046 Jenkintown PA Zone 1 (High) 40/100
91 19047 Langhorne PA Zone 1 (High) 40/100
92 19052 Lenni PA Zone 1 (High) 40/100
93 19063 Media PA Zone 1 (High) 40/100
94 19064 Springfield PA Zone 1 (High) 40/100
95 19073 Newtown Square PA Zone 1 (High) 40/100
96 19075 Oreland PA Zone 1 (High) 40/100
97 19081 Swarthmore PA Zone 1 (High) 40/100
98 19083 Havertown PA Zone 1 (High) 40/100
99 19085 Villanova PA Zone 1 (High) 40/100
100 19086 Wallingford PA Zone 1 (High) 40/100

Methodology

Radon rankings are based on EPA county-level radon zone classifications. Zone 1 (highest risk) has predicted average indoor radon levels above 4 pCi/L — the EPA action level. Zone 2 is moderate (2-4 pCi/L) and Zone 3 is low (below 2 pCi/L). Within Zone 1, ZIP codes are sub-ranked by Home Safety Score to prioritize areas with compounding risk factors.

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: 2026-08-14.

Frequently Asked Questions

What is EPA Radon Zone 1?

Zone 1 is the EPA highest-risk classification, meaning the county has predicted average indoor radon levels above 4 pCi/L — the level at which the EPA recommends mitigation. Radon causes about 21,000 lung cancer deaths per year in the U.S.

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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