2026 Rankings

Highest Radon Risk ZIP Codes in Massachusetts — 2026

Last updated: June 4, 2026

269 ZIP codes ranked by Radon Zone #1: ZIP 02148 (Malden, MA) — 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 269 ZIP codes with data in Massachusetts, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All Massachusetts Rankings

Statistic Value
ZIP codes ranked 269
Lowest value Zone 1 (High)
Median value Zone 1 (High)
State Massachusetts

100 Lowest-Ranked ZIP Codes

Rank ZIP Code City State Radon Zone Safety Score
1 02148 Malden MA Zone 1 (High) 33/100
2 02155 Medford MA Zone 1 (High) 36/100
3 01074 South Barre MA Zone 1 (High) 40/100
4 01366 Petersham MA Zone 1 (High) 40/100
5 01431 Ashby MA Zone 1 (High) 40/100
6 01438 East Templeton MA Zone 1 (High) 40/100
7 01467 Still River MA Zone 1 (High) 40/100
8 01472 West Groton MA Zone 1 (High) 40/100
9 01508 Charlton City MA Zone 1 (High) 40/100
10 01509 Charlton Depot MA Zone 1 (High) 40/100
11 01523 Lancaster MA Zone 1 (High) 40/100
12 01525 Linwood MA Zone 1 (High) 40/100
13 01531 New Braintree MA Zone 1 (High) 40/100
14 01537 North Oxford MA Zone 1 (High) 40/100
15 01538 North Uxbridge MA Zone 1 (High) 40/100
16 01541 Princeton MA Zone 1 (High) 40/100
17 01586 West Millbury MA Zone 1 (High) 40/100
18 01718 Village Of Nagog Woods MA Zone 1 (High) 40/100
19 01731 Hanscom Afb MA Zone 1 (High) 40/100
20 01784 Woodville MA Zone 1 (High) 40/100
21 01862 North Billerica MA Zone 1 (High) 40/100
22 01865 Nutting Lake MA Zone 1 (High) 40/100
23 01885 West Boxford MA Zone 1 (High) 40/100
24 01937 Hathorne MA Zone 1 (High) 40/100
25 02156 West Medford MA Zone 1 (High) 40/100
26 02455 North Waltham MA Zone 1 (High) 40/100
27 02456 New Town MA Zone 1 (High) 40/100
28 02459 Newton Center MA Zone 1 (High) 40/100
29 02461 Newton Highlands MA Zone 1 (High) 40/100
30 02468 Waban MA Zone 1 (High) 40/100
31 02475 Arlington Heights MA Zone 1 (High) 40/100
32 02479 Waverley MA Zone 1 (High) 40/100
33 02495 Nonantum MA Zone 1 (High) 40/100
34 01821 Billerica MA Zone 1 (High) 43/100
35 02176 Melrose MA Zone 1 (High) 43/100
36 01866 Pinehurst MA Zone 1 (High) 45/100
37 01879 Tyngsboro MA Zone 1 (High) 45/100
38 01950 Newburyport MA Zone 1 (High) 45/100
39 01982 South Hamilton MA Zone 1 (High) 45/100
40 02460 Newtonville MA Zone 1 (High) 45/100
41 02465 West Newton MA Zone 1 (High) 45/100
42 02481 Wellesley Hills MA Zone 1 (High) 45/100
43 02153 Medford MA Zone 1 (High) 46/100
44 01810 Andover MA Zone 1 (High) 47/100
45 01921 Boxford MA Zone 1 (High) 49/100
46 01568 Upton MA Zone 1 (High) 50/100
47 01822 Billerica MA Zone 1 (High) 51/100
48 01938 Ipswich MA Zone 1 (High) 51/100
49 01952 Salisbury MA Zone 1 (High) 51/100
50 01951 Newbury MA Zone 1 (High) 52/100
51 01068 Oakham MA Zone 1 (High) 53/100
52 01474 West Townsend MA Zone 1 (High) 53/100
53 01518 Fiskdale MA Zone 1 (High) 53/100
54 01519 Grafton MA Zone 1 (High) 53/100
55 01522 Jefferson MA Zone 1 (High) 53/100
56 01527 Millbury MA Zone 1 (High) 53/100
57 01529 Millville MA Zone 1 (High) 53/100
58 01561 South Lancaster MA Zone 1 (High) 53/100
59 01745 Fayville MA Zone 1 (High) 53/100
60 01908 Nahant MA Zone 1 (High) 53/100
61 01965 Prides Crossing MA Zone 1 (High) 53/100
62 02135 Brighton MA Zone 1 (High) 53/100
63 02462 Newton Lower Falls MA Zone 1 (High) 53/100
64 02466 Auburndale MA Zone 1 (High) 53/100
65 01524 Leicester MA Zone 1 (High) 54/100
66 01611 Cherry Valley MA Zone 1 (High) 55/100
67 01841 Lawrence MA Zone 1 (High) 55/100
68 01845 North Andover MA Zone 1 (High) 55/100
69 01867 Reading MA Zone 1 (High) 55/100
70 01906 Saugus MA Zone 1 (High) 55/100
71 01907 Swampscott MA Zone 1 (High) 55/100
72 01930 Gloucester MA Zone 1 (High) 55/100
73 01945 Marblehead MA Zone 1 (High) 55/100
74 01960 Peabody MA Zone 1 (High) 55/100
75 01966 Rockport MA Zone 1 (High) 55/100
76 02474 Arlington MA Zone 1 (High) 55/100
77 01005 Barre MA Zone 1 (High) 56/100
78 01742 Concord MA Zone 1 (High) 56/100
79 01749 Hudson MA Zone 1 (High) 56/100
80 01812 Andover MA Zone 1 (High) 56/100
81 01899 Andover MA Zone 1 (High) 56/100
82 02238 Cambridge MA Zone 1 (High) 56/100
83 02239 Cambridge MA Zone 1 (High) 56/100
84 05501 Andover MA Zone 1 (High) 56/100
85 05544 Andover MA Zone 1 (High) 56/100
86 01757 Milford MA Zone 1 (High) 57/100
87 01760 Natick MA Zone 1 (High) 58/100
88 01801 Woburn MA Zone 1 (High) 58/100
89 01830 Haverhill MA Zone 1 (High) 58/100
90 01844 Methuen MA Zone 1 (High) 58/100
91 01851 Lowell MA Zone 1 (High) 58/100
92 01854 Lowell MA Zone 1 (High) 58/100
93 01863 North Chelmsford MA Zone 1 (High) 58/100
94 01876 Tewksbury MA Zone 1 (High) 58/100
95 01880 Wakefield MA Zone 1 (High) 58/100
96 01913 Amesbury MA Zone 1 (High) 58/100
97 01915 Beverly MA Zone 1 (High) 58/100
98 02138 Cambridge MA Zone 1 (High) 58/100
99 02139 Cambridge MA Zone 1 (High) 58/100
100 02140 Cambridge MA Zone 1 (High) 58/100

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: 2026-06-04.

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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