New Jersey Cities Ranked by Indoor Radon Levels

Measured averages from Airthings devices across New Jersey, USA. Action level: 4 pCi/L — the threshold at which remediation is recommended.

Belvidere has the highest measured indoor radon in New Jersey at 9.0 pCi/L, based on Airthings measurements across 337 cities.

Updated August 30, 2026

Highest city

9.0pCi/L

Belvidere

New Jersey city average

1.7pCi/L

across 337 cities

Above action level

8/ 337

cities

New Jersey Cities Ranked by Indoor Radon Levels
#	Location	Avg level	vs action level
1	Belvidere	9.0 pCi/L	2.3× over
2	Hasbrouck Heights	8.7 pCi/L	2.2× over
3	Highland Lake	5.7 pCi/L	1.4× over
4	Frenchtown	4.9 pCi/L	1.2× over
5	Hampton	4.6 pCi/L	1.1× over
6	Swedesboro	4.5 pCi/L	1.1× over
7	Phillipsburg	4.2 pCi/L	1.1× over
8	Alpine	4.0 pCi/L	1.0× over
✓ Below EPA action level (4 pCi/L)
9	Mount Holly	4.0 pCi/L	1.0× under
10	Hopewell	3.8 pCi/L	1.0× under
11	Oakhurst	3.8 pCi/L	0.9× under
12	Ewing	3.7 pCi/L	0.9× under
13	West Freehold	3.6 pCi/L	0.9× under
14	Hamburg	3.6 pCi/L	0.9× under
15	Clinton	3.3 pCi/L	0.8× under
16	Groveville	3.2 pCi/L	0.8× under
17	Pine Hill	3.1 pCi/L	0.8× under
18	Rockaway	3.1 pCi/L	0.8× under
19	Freehold	3.1 pCi/L	0.8× under
20	Long Valley	2.9 pCi/L	0.7× under
21	Scotch Plains	2.9 pCi/L	0.7× under
22	Wanaque	2.9 pCi/L	0.7× under
23	Newton	2.9 pCi/L	0.7× under
24	Ten Mile Run	2.8 pCi/L	0.7× under
25	Montvale	2.8 pCi/L	0.7× under
26	Echelon	2.8 pCi/L	0.7× under
27	Beattystown	2.8 pCi/L	0.7× under
28	Wenonah	2.8 pCi/L	0.7× under
29	Hopatcong Hills	2.8 pCi/L	0.7× under
30	Middlebush	2.8 pCi/L	0.7× under
31	Kingston	2.7 pCi/L	0.7× under
32	West Milford	2.7 pCi/L	0.7× under
33	Beckett	2.6 pCi/L	0.7× under
34	Hightstown	2.6 pCi/L	0.7× under
35	Mountain Lakes	2.6 pCi/L	0.7× under
36	Oak Valley	2.6 pCi/L	0.7× under
37	Butler	2.6 pCi/L	0.7× under
38	Waldwick	2.6 pCi/L	0.7× under
39	Washington	2.6 pCi/L	0.6× under
40	Lebanon	2.5 pCi/L	0.6× under
41	Princeton Meadows	2.5 pCi/L	0.6× under
42	Middlesex	2.5 pCi/L	0.6× under
43	Warren Township	2.5 pCi/L	0.6× under
44	Flemington	2.5 pCi/L	0.6× under
45	Highland Park	2.5 pCi/L	0.6× under
46	Navesink	2.5 pCi/L	0.6× under
47	Shrewsbury	2.5 pCi/L	0.6× under
48	Pompton Lakes	2.5 pCi/L	0.6× under
49	Strathmore	2.5 pCi/L	0.6× under
50	Sussex	2.5 pCi/L	0.6× under
51	Chesilhurst	2.5 pCi/L	0.6× under
52	Jamesburg	2.5 pCi/L	0.6× under
53	Bernardsville	2.4 pCi/L	0.6× under
54	White Meadow Lake	2.4 pCi/L	0.6× under
55	Wayne	2.4 pCi/L	0.6× under
56	Martinsville	2.4 pCi/L	0.6× under
57	Califon	2.4 pCi/L	0.6× under
58	Chester	2.3 pCi/L	0.6× under
59	Clayton	2.3 pCi/L	0.6× under
60	Hillside	2.3 pCi/L	0.6× under
61	Bloomingdale	2.3 pCi/L	0.6× under
62	Edison	2.3 pCi/L	0.6× under
63	Monmouth Junction	2.3 pCi/L	0.6× under
64	Robertsville	2.3 pCi/L	0.6× under
65	Society Hill	2.3 pCi/L	0.6× under
66	Clark	2.3 pCi/L	0.6× under
67	Gladstone	2.3 pCi/L	0.6× under
68	Whitehouse Station	2.3 pCi/L	0.6× under
69	Pennington	2.2 pCi/L	0.6× under
70	Clifton	2.2 pCi/L	0.6× under
71	Lake Mohawk	2.2 pCi/L	0.6× under
72	Englishtown	2.2 pCi/L	0.6× under
73	Stanhope	2.2 pCi/L	0.6× under
74	Essex Fells	2.2 pCi/L	0.6× under
75	Bridgewater	2.2 pCi/L	0.5× under
76	East Freehold	2.2 pCi/L	0.5× under
77	Fair Haven	2.2 pCi/L	0.5× under
78	Hardwick	2.1 pCi/L	0.5× under
79	Springdale	2.1 pCi/L	0.5× under
80	Victory Gardens	2.1 pCi/L	0.5× under
81	Dunellen	2.1 pCi/L	0.5× under
82	South River	2.1 pCi/L	0.5× under
83	Rumson	2.1 pCi/L	0.5× under
84	Bradley Gardens	2.1 pCi/L	0.5× under
85	Hawthorne	2.1 pCi/L	0.5× under
86	Hopatcong	2.1 pCi/L	0.5× under
87	Kenilworth	2.1 pCi/L	0.5× under
88	Kinnelon	2.1 pCi/L	0.5× under
89	Lakehurst	2.1 pCi/L	0.5× under
90	Morristown	2.1 pCi/L	0.5× under
91	Ashland	2.1 pCi/L	0.5× under
92	Succasunna	2.1 pCi/L	0.5× under
93	Bayonne	2.1 pCi/L	0.5× under
94	Union City	2.1 pCi/L	0.5× under
95	Bedminster	2.0 pCi/L	0.5× under
96	Brookdale	2.0 pCi/L	0.5× under
97	Kendall Park	2.0 pCi/L	0.5× under
98	Paulsboro	2.0 pCi/L	0.5× under
99	Tinton Falls	2.0 pCi/L	0.5× under
100	Boonton	2.0 pCi/L	0.5× under
101	Sicklerville	2.0 pCi/L	0.5× under
102	North Plainfield	2.0 pCi/L	0.5× under
103	Willingboro	2.0 pCi/L	0.5× under
104	Blackwood	2.0 pCi/L	0.5× under
105	Lambertville	2.0 pCi/L	0.5× under
106	Lincroft	2.0 pCi/L	0.5× under
107	Hackettstown	1.9 pCi/L	0.5× under
108	Maywood	1.9 pCi/L	0.5× under
109	Magnolia	1.9 pCi/L	0.5× under
110	Marlboro	1.9 pCi/L	0.5× under
111	Glen Ridge	1.9 pCi/L	0.5× under
112	Newfield	1.9 pCi/L	0.5× under
113	Lincoln Park	1.9 pCi/L	0.5× under
114	Mendham	1.9 pCi/L	0.5× under
115	Morganville	1.9 pCi/L	0.5× under
116	Ocean Acres	1.9 pCi/L	0.5× under
117	Berkeley Heights	1.9 pCi/L	0.5× under
118	Gibbsboro	1.9 pCi/L	0.5× under
119	Mullica Hill	1.9 pCi/L	0.5× under
120	Weston	1.9 pCi/L	0.5× under
121	Woodstown	1.9 pCi/L	0.5× under
122	Linwood	1.9 pCi/L	0.5× under
123	North Haledon	1.9 pCi/L	0.5× under
124	Williamstown	1.9 pCi/L	0.5× under
125	Midland Park	1.8 pCi/L	0.5× under
126	Watchung	1.8 pCi/L	0.5× under
127	Moorestown-Lenola	1.8 pCi/L	0.5× under
128	Princeton Junction	1.8 pCi/L	0.4× under
129	Vineland	1.8 pCi/L	0.4× under
130	Allentown	1.8 pCi/L	0.4× under
131	Woodbury Heights	1.8 pCi/L	0.4× under
132	Metuchen	1.8 pCi/L	0.4× under
133	Milford	1.8 pCi/L	0.4× under
134	Princeton	1.8 pCi/L	0.4× under
135	Randolph	1.8 pCi/L	0.4× under
136	Laurel Springs	1.8 pCi/L	0.4× under
137	Cranford	1.7 pCi/L	0.4× under
138	Lake Telemark	1.7 pCi/L	0.4× under
139	East Brunswick	1.7 pCi/L	0.4× under
140	Prospect Park	1.7 pCi/L	0.4× under
141	Green Knoll	1.7 pCi/L	0.4× under
142	Lawrenceville	1.7 pCi/L	0.4× under
143	Turnersville	1.7 pCi/L	0.4× under
144	Franklin Lakes	1.7 pCi/L	0.4× under
145	Delanco	1.7 pCi/L	0.4× under
146	Kenvil	1.7 pCi/L	0.4× under
147	South Bound Brook	1.7 pCi/L	0.4× under
148	Concordia	1.7 pCi/L	0.4× under
149	Morris Plains	1.7 pCi/L	0.4× under
150	Woodcliff Lake	1.7 pCi/L	0.4× under
151	Ringwood	1.7 pCi/L	0.4× under
152	Fairfield	1.6 pCi/L	0.4× under
153	Lyndhurst	1.6 pCi/L	0.4× under
154	Old Bridge	1.6 pCi/L	0.4× under
155	Rossmoor	1.6 pCi/L	0.4× under
156	Budd Lake	1.6 pCi/L	0.4× under
157	Whittingham	1.6 pCi/L	0.4× under
158	Ellisburg	1.6 pCi/L	0.4× under
159	Mahwah	1.6 pCi/L	0.4× under
160	Brass Castle	1.6 pCi/L	0.4× under
161	Dayton	1.6 pCi/L	0.4× under
162	Red Bank	1.6 pCi/L	0.4× under
163	Wanamassa	1.6 pCi/L	0.4× under
164	Vista Center	1.6 pCi/L	0.4× under
165	Wyckoff	1.6 pCi/L	0.4× under
166	River Edge	1.6 pCi/L	0.4× under
167	Medford Lakes	1.6 pCi/L	0.4× under
168	Madison Park	1.6 pCi/L	0.4× under
169	Milltown	1.6 pCi/L	0.4× under
170	Yorketown	1.5 pCi/L	0.4× under
171	Farmingdale	1.5 pCi/L	0.4× under
172	Rutherford	1.5 pCi/L	0.4× under
173	Somerville	1.5 pCi/L	0.4× under
174	South Plainfield	1.5 pCi/L	0.4× under
175	Alpha	1.5 pCi/L	0.4× under
176	New Egypt	1.5 pCi/L	0.4× under
177	Plainsboro Center	1.5 pCi/L	0.4× under
178	Haworth	1.5 pCi/L	0.4× under
179	Mercerville	1.5 pCi/L	0.4× under
180	Plainfield	1.5 pCi/L	0.4× under
181	East Hanover	1.5 pCi/L	0.4× under
182	Haddonfield	1.5 pCi/L	0.4× under
183	Short Hills	1.5 pCi/L	0.4× under
184	Tenafly	1.5 pCi/L	0.4× under
185	Audubon	1.4 pCi/L	0.4× under
186	Closter	1.4 pCi/L	0.4× under
187	Greentree	1.4 pCi/L	0.4× under
188	Livingston	1.4 pCi/L	0.4× under
189	Ogdensburg	1.4 pCi/L	0.4× under
190	Glen Rock	1.4 pCi/L	0.4× under
191	Manville	1.4 pCi/L	0.4× under
192	Berlin	1.4 pCi/L	0.4× under
193	Iselin	1.4 pCi/L	0.3× under
194	Eatontown	1.4 pCi/L	0.3× under
195	River Vale	1.4 pCi/L	0.3× under
196	Cresskill	1.4 pCi/L	0.3× under
197	Madison	1.4 pCi/L	0.3× under
198	Upper Saddle River	1.4 pCi/L	0.3× under
199	Leonia	1.4 pCi/L	0.3× under
200	Matawan	1.4 pCi/L	0.3× under
201	Riverton	1.4 pCi/L	0.3× under
202	Cliffside Park	1.4 pCi/L	0.3× under
203	Park Ridge	1.4 pCi/L	0.3× under
204	Wharton	1.4 pCi/L	0.3× under
205	High Bridge	1.3 pCi/L	0.3× under
206	Little Silver	1.3 pCi/L	0.3× under
207	Montclair	1.3 pCi/L	0.3× under
208	Upper Montclair	1.3 pCi/L	0.3× under
209	Caldwell	1.3 pCi/L	0.3× under
210	Fanwood	1.3 pCi/L	0.3× under
211	Paramus	1.3 pCi/L	0.3× under
212	Roselle Park	1.3 pCi/L	0.3× under
213	Fairview	1.3 pCi/L	0.3× under
214	Twin Rivers	1.3 pCi/L	0.3× under
215	Westfield	1.3 pCi/L	0.3× under
216	Allendale	1.3 pCi/L	0.3× under
217	Burlington	1.3 pCi/L	0.3× under
218	Riverdale	1.3 pCi/L	0.3× under
219	Linden	1.3 pCi/L	0.3× under
220	Edgewater	1.3 pCi/L	0.3× under
221	New Brunswick	1.3 pCi/L	0.3× under
222	Oakland	1.3 pCi/L	0.3× under
223	Pitman	1.3 pCi/L	0.3× under
224	Englewood Cliffs	1.3 pCi/L	0.3× under
225	Piscataway	1.3 pCi/L	0.3× under
226	Totowa	1.3 pCi/L	0.3× under
227	Roselle	1.2 pCi/L	0.3× under
228	Springfield	1.2 pCi/L	0.3× under
229	Bergenfield	1.2 pCi/L	0.3× under
230	Bordentown	1.2 pCi/L	0.3× under
231	South Vineland	1.2 pCi/L	0.3× under
232	Dumont	1.2 pCi/L	0.3× under
233	Mount Arlington	1.2 pCi/L	0.3× under
234	Mount Laurel	1.2 pCi/L	0.3× under
235	Northfield	1.2 pCi/L	0.3× under
236	West Orange	1.2 pCi/L	0.3× under
237	Clearbrook Park	1.2 pCi/L	0.3× under
238	Ocean Gate	1.2 pCi/L	0.3× under
239	Demarest	1.2 pCi/L	0.3× under
240	Ho-Ho-Kus	1.2 pCi/L	0.3× under
241	Old Tappan	1.2 pCi/L	0.3× under
242	Woodbridge	1.2 pCi/L	0.3× under
243	North Caldwell	1.2 pCi/L	0.3× under
244	Trenton	1.2 pCi/L	0.3× under
245	Glendora	1.1 pCi/L	0.3× under
246	National Park	1.1 pCi/L	0.3× under
247	Somerset	1.1 pCi/L	0.3× under
248	South Orange	1.1 pCi/L	0.3× under
249	Florham Park	1.1 pCi/L	0.3× under
250	Harrington Park	1.1 pCi/L	0.3× under
251	Teaneck	1.1 pCi/L	0.3× under
252	Spotswood	1.1 pCi/L	0.3× under
253	Cedar Grove	1.1 pCi/L	0.3× under
254	Roebling	1.1 pCi/L	0.3× under
255	Ridgewood	1.1 pCi/L	0.3× under
256	Robbinsville	1.1 pCi/L	0.3× under
257	Victory Lakes	1.1 pCi/L	0.3× under
258	Woodland Park	1.1 pCi/L	0.3× under
259	Bloomfield	1.1 pCi/L	0.3× under
260	Chatham	1.1 pCi/L	0.3× under
261	Bound Brook	1.1 pCi/L	0.3× under
262	Parsippany	1.1 pCi/L	0.3× under
263	Passaic	1.1 pCi/L	0.3× under
264	Garfield	1.1 pCi/L	0.3× under
265	Manasquan	1.1 pCi/L	0.3× under
266	Wood-Ridge	1.1 pCi/L	0.3× under
267	Northvale	1.0 pCi/L	0.3× under
268	Nutley	1.0 pCi/L	0.3× under
269	Winfield	1.0 pCi/L	0.3× under
270	Cherry Hill Mall	1.0 pCi/L	0.3× under
271	Carlstadt	1.0 pCi/L	0.3× under
272	Hanover	1.0 pCi/L	0.3× under
273	Raritan	1.0 pCi/L	0.3× under
274	Heathcote	1.0 pCi/L	0.3× under
275	New Providence	1.0 pCi/L	0.3× under
276	Orange	1.0 pCi/L	0.3× under
277	Mountainside	1.0 pCi/L	0.2× under
278	Ramtown	1.0 pCi/L	0.2× under
279	Saddle Brook	1.0 pCi/L	0.2× under
280	Palmyra	1.0 pCi/L	0.2× under
281	Smithville	1.0 pCi/L	0.2× under
282	Jackson	1.0 pCi/L	0.2× under
283	Verona	1.0 pCi/L	0.2× under
284	North Arlington	0.9 pCi/L	0.2× under
285	Atlantic Highlands	0.9 pCi/L	0.2× under
286	Fair Lawn	0.9 pCi/L	0.2× under
287	North Bergen	0.9 pCi/L	0.2× under
288	Camden	0.9 pCi/L	0.2× under
289	Irvington	0.9 pCi/L	0.2× under
290	Maplewood	0.9 pCi/L	0.2× under
291	Ramsey	0.9 pCi/L	0.2× under
292	Annandale	0.9 pCi/L	0.2× under
293	Oradell	0.9 pCi/L	0.2× under
294	Saddle River	0.9 pCi/L	0.2× under
295	White Horse	0.9 pCi/L	0.2× under
296	Brooklawn	0.9 pCi/L	0.2× under
297	Somers Point	0.9 pCi/L	0.2× under
298	Fort Lee	0.8 pCi/L	0.2× under
299	Wallington	0.8 pCi/L	0.2× under
300	Hammonton	0.8 pCi/L	0.2× under
301	Harrison	0.8 pCi/L	0.2× under
302	Hillsdale	0.8 pCi/L	0.2× under
303	Collingswood	0.8 pCi/L	0.2× under
304	New Milford	0.8 pCi/L	0.2× under
305	Union	0.8 pCi/L	0.2× under
306	Norwood	0.8 pCi/L	0.2× under
307	Roseland	0.8 pCi/L	0.2× under
308	Englewood	0.8 pCi/L	0.2× under
309	Summit	0.8 pCi/L	0.2× under
310	Belleville	0.7 pCi/L	0.2× under
311	Garwood	0.7 pCi/L	0.2× under
312	Shark River Hills	0.7 pCi/L	0.2× under
313	Westville	0.7 pCi/L	0.2× under
314	Cherry Hill	0.7 pCi/L	0.2× under
315	Marlton	0.7 pCi/L	0.2× under
316	Ridgefield Park	0.7 pCi/L	0.2× under
317	Carteret	0.7 pCi/L	0.2× under
318	Newark	0.7 pCi/L	0.2× under
319	Keyport	0.7 pCi/L	0.2× under
320	South Amboy	0.7 pCi/L	0.2× under
321	Ridgefield	0.7 pCi/L	0.2× under
322	Elizabeth	0.7 pCi/L	0.2× under
323	Fords	0.7 pCi/L	0.2× under
324	Pennsauken	0.7 pCi/L	0.2× under
325	Guttenberg	0.6 pCi/L	0.2× under
326	Secaucus	0.6 pCi/L	0.2× under
327	Golden Triangle	0.6 pCi/L	0.2× under
328	Leisure Village East	0.6 pCi/L	0.2× under
329	Hoboken	0.6 pCi/L	0.1× under
330	Jersey City	0.6 pCi/L	0.1× under
331	Keansburg	0.5 pCi/L	0.1× under
332	Brownville	0.5 pCi/L	0.1× under
333	Weehawken	0.5 pCi/L	0.1× under
334	Lakewood	0.5 pCi/L	0.1× under
335	Gibbstown	0.5 pCi/L	0.1× under
336	Hackensack	0.4 pCi/L	0.1× under
337	Port Monmouth	0.4 pCi/L	0.1× under

See USA cities ranked by radon level See all States ranked by radon level