EPA Radon Zone 1 ZIP Codes in New Jersey - 2026

Out of 246 ZIP codes with data in New Jersey, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes in EPA Radon Zone 1 | All New Jersey Rankings

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

100 Lowest-Ranked ZIP Codes

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

Methodology

This ranking is limited to EPA county-level radon zone classification. Zone 1 identifies the highest county-level 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: 2026-08-31.

Frequently Asked Questions

What is EPA Radon Zone 1?

Zone 1 is the EPA highest 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%.