2026 Rankings

Highest Radon Risk ZIP Codes in New Jersey — 2026

Last updated: August 14, 2026

246 ZIP codes ranked by Radon Zone #1: ZIP 07005 (Boonton, NJ) - 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 246 ZIP codes with data in New Jersey, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All New Jersey Rankings

Statistic Value
ZIP codes ranked 246
Lowest value Zone 1 (High)
Median value Zone 1 (High)
State New Jersey

100 Lowest-Ranked ZIP Codes

Rank ZIP Code City State Radon Zone Safety Score
1 07005 Boonton NJ Zone 1 (High) 33/100
2 07734 Keansburg NJ Zone 1 (High) 33/100
3 07748 Middletown NJ Zone 1 (High) 33/100
4 07801 Dover NJ Zone 1 (High) 33/100
5 07828 Budd Lake NJ Zone 1 (High) 33/100
6 07834 Denville NJ Zone 1 (High) 33/100
7 07836 Flanders NJ Zone 1 (High) 33/100
8 07840 Hackettstown NJ Zone 1 (High) 33/100
9 07853 Long Valley NJ Zone 1 (High) 33/100
10 07866 Rockaway NJ Zone 1 (High) 33/100
11 07885 Wharton NJ Zone 1 (High) 33/100
12 08501 Allentown NJ Zone 1 (High) 33/100
13 08560 Titusville NJ Zone 1 (High) 33/100
14 08618 Trenton NJ Zone 1 (High) 33/100
15 08619 Trenton NJ Zone 1 (High) 33/100
16 08628 Trenton NJ Zone 1 (High) 33/100
17 08648 Lawrence Township NJ Zone 1 (High) 33/100
18 08690 Trenton NJ Zone 1 (High) 33/100
19 08691 Trenton NJ Zone 1 (High) 33/100
20 08822 Flemington NJ Zone 1 (High) 33/100
21 08826 Glen Gardner NJ Zone 1 (High) 33/100
22 07950 Morris Plains NJ Zone 1 (High) 34/100
23 07830 Califon NJ Zone 1 (High) 37/100
24 07940 Madison NJ Zone 1 (High) 37/100
25 07960 Morristown NJ Zone 1 (High) 37/100
26 07747 Matawan NJ Zone 1 (High) 38/100
27 07849 Lake Hopatcong NJ Zone 1 (High) 38/100
28 07405 Butler NJ Zone 1 (High) 39/100
29 07035 Lincoln Park NJ Zone 1 (High) 40/100
30 07932 Florham Park NJ Zone 1 (High) 41/100
31 08833 Lebanon NJ Zone 1 (High) 41/100
32 07852 Ledgewood NJ Zone 1 (High) 42/100
33 07869 Randolph NJ Zone 1 (High) 43/100
34 07726 Englishtown NJ Zone 1 (High) 44/100
35 07847 Kenvil NJ Zone 1 (High) 44/100
36 07857 Netcong NJ Zone 1 (High) 44/100
37 08520 Hightstown NJ Zone 1 (High) 44/100
38 07440 Pequannock NJ Zone 1 (High) 45/100
39 07728 Freehold NJ Zone 1 (High) 45/100
40 07850 Landing NJ Zone 1 (High) 45/100
41 08829 High Bridge NJ Zone 1 (High) 46/100
42 07046 Mountain Lakes NJ Zone 1 (High) 47/100
43 07762 Spring Lake NJ Zone 1 (High) 47/100
44 07863 Oxford NJ Zone 1 (High) 47/100
45 07882 Washington NJ Zone 1 (High) 47/100
46 08809 Clinton NJ Zone 1 (High) 47/100
47 07034 Lake Hiawatha NJ Zone 1 (High) 48/100
48 07701 Red Bank NJ Zone 1 (High) 48/100
49 07717 Avon By The Sea NJ Zone 1 (High) 48/100
50 07719 Belmar NJ Zone 1 (High) 48/100
51 07746 Marlboro NJ Zone 1 (High) 48/100
52 07751 Morganville NJ Zone 1 (High) 48/100
53 07865 Port Murray NJ Zone 1 (High) 48/100
54 08730 Brielle NJ Zone 1 (High) 48/100
55 08801 Annandale NJ Zone 1 (High) 48/100
56 07045 Montville NJ Zone 1 (High) 49/100
57 07054 Parsippany NJ Zone 1 (High) 49/100
58 07731 Howell NJ Zone 1 (High) 49/100
59 07702 Shrewsbury NJ Zone 1 (High) 50/100
60 07704 Fair Haven NJ Zone 1 (High) 50/100
61 07711 Allenhurst NJ Zone 1 (High) 50/100
62 07716 Atlantic Highlands NJ Zone 1 (High) 50/100
63 07718 Belford NJ Zone 1 (High) 50/100
64 07720 Bradley Beach NJ Zone 1 (High) 50/100
65 07722 Colts Neck NJ Zone 1 (High) 50/100
66 07723 Deal NJ Zone 1 (High) 50/100
67 07724 Eatontown NJ Zone 1 (High) 50/100
68 07732 Highlands NJ Zone 1 (High) 50/100
69 07737 Leonardo NJ Zone 1 (High) 50/100
70 07738 Lincroft NJ Zone 1 (High) 50/100
71 07739 Little Silver NJ Zone 1 (High) 50/100
72 07740 Long Branch NJ Zone 1 (High) 50/100
73 07750 Monmouth Beach NJ Zone 1 (High) 50/100
74 07753 Neptune NJ Zone 1 (High) 50/100
75 07755 Oakhurst NJ Zone 1 (High) 50/100
76 07756 Ocean Grove NJ Zone 1 (High) 50/100
77 07757 Oceanport NJ Zone 1 (High) 50/100
78 07758 Port Monmouth NJ Zone 1 (High) 50/100
79 07760 Rumson NJ Zone 1 (High) 50/100
80 07764 West Long Branch NJ Zone 1 (High) 50/100
81 07926 Brookside NJ Zone 1 (High) 50/100
82 07927 Cedar Knolls NJ Zone 1 (High) 50/100
83 07945 Mendham NJ Zone 1 (High) 50/100
84 07981 Whippany NJ Zone 1 (High) 50/100
85 08534 Pennington NJ Zone 1 (High) 50/100
86 08542 Princeton NJ Zone 1 (High) 50/100
87 08544 Princeton NJ Zone 1 (High) 50/100
88 08550 Princeton Junction NJ Zone 1 (High) 50/100
89 08608 Trenton NJ Zone 1 (High) 50/100
90 08609 Trenton NJ Zone 1 (High) 50/100
91 08610 Trenton NJ Zone 1 (High) 50/100
92 08611 Trenton NJ Zone 1 (High) 50/100
93 08620 Trenton NJ Zone 1 (High) 50/100
94 08629 Trenton NJ Zone 1 (High) 50/100
95 08638 Trenton NJ Zone 1 (High) 50/100
96 08889 Whitehouse Station NJ Zone 1 (High) 50/100
97 07803 Mine Hill NJ Zone 1 (High) 52/100
98 08865 Phillipsburg NJ Zone 1 (High) 52/100
99 07856 Mount Arlington NJ Zone 1 (High) 54/100
100 08886 Stewartsville NJ Zone 1 (High) 57/100

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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