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 340 cities.

Updated September 28, 2026

Highest city

9.0pCi/L

Belvidere

New Jersey city average

1.7pCi/L

across 340 cities

Above action level

8/ 340

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	Swedesboro	4.7 pCi/L	1.2× over
6	Hampton	4.6 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	3.9 pCi/L	1.0× under
11	Ewing	3.7 pCi/L	0.9× under
12	Hamburg	3.6 pCi/L	0.9× under
13	West Freehold	3.6 pCi/L	0.9× under
14	Oakhurst	3.6 pCi/L	0.9× under
15	Hackettstown	3.3 pCi/L	0.8× under
16	Groveville	3.2 pCi/L	0.8× under
17	Clinton	3.2 pCi/L	0.8× under
18	Pine Hill	3.1 pCi/L	0.8× under
19	Rockaway	3.1 pCi/L	0.8× under
20	Freehold	3.1 pCi/L	0.8× under
21	Long Valley	2.9 pCi/L	0.7× under
22	Scotch Plains	2.9 pCi/L	0.7× under
23	Wanaque	2.9 pCi/L	0.7× under
24	Wenonah	2.9 pCi/L	0.7× under
25	Ten Mile Run	2.8 pCi/L	0.7× under
26	Montvale	2.8 pCi/L	0.7× under
27	Echelon	2.8 pCi/L	0.7× under
28	Newton	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	Beattystown	2.7 pCi/L	0.7× under
32	Kingston	2.7 pCi/L	0.7× under
33	West Milford	2.7 pCi/L	0.7× under
34	Beckett	2.6 pCi/L	0.7× under
35	Butler	2.6 pCi/L	0.7× under
36	Mountain Lakes	2.6 pCi/L	0.6× under
37	Oak Valley	2.5 pCi/L	0.6× under
38	Lebanon	2.5 pCi/L	0.6× under
39	Warren Township	2.5 pCi/L	0.6× under
40	Hightstown	2.5 pCi/L	0.6× under
41	Middlesex	2.5 pCi/L	0.6× under
42	Shrewsbury	2.5 pCi/L	0.6× under
43	Flemington	2.5 pCi/L	0.6× under
44	Pompton Lakes	2.5 pCi/L	0.6× under
45	Sussex	2.5 pCi/L	0.6× under
46	Waldwick	2.5 pCi/L	0.6× under
47	Chesilhurst	2.5 pCi/L	0.6× under
48	Highland Park	2.5 pCi/L	0.6× under
49	Jamesburg	2.5 pCi/L	0.6× under
50	Hillside	2.4 pCi/L	0.6× under
51	Strathmore	2.4 pCi/L	0.6× under
52	Brass Castle	2.4 pCi/L	0.6× under
53	White Meadow Lake	2.4 pCi/L	0.6× under
54	Wayne	2.4 pCi/L	0.6× under
55	Martinsville	2.4 pCi/L	0.6× under
56	Califon	2.4 pCi/L	0.6× under
57	Chester	2.3 pCi/L	0.6× under
58	Clayton	2.3 pCi/L	0.6× under
59	Bernardsville	2.3 pCi/L	0.6× under
60	Monmouth Junction	2.3 pCi/L	0.6× under
61	South River	2.3 pCi/L	0.6× under
62	Edison	2.3 pCi/L	0.6× under
63	Bloomingdale	2.3 pCi/L	0.6× under
64	Clark	2.3 pCi/L	0.6× under
65	Navesink	2.3 pCi/L	0.6× under
66	Robertsville	2.3 pCi/L	0.6× under
67	Pennington	2.3 pCi/L	0.6× under
68	Society Hill	2.3 pCi/L	0.6× under
69	Whitehouse Station	2.3 pCi/L	0.6× under
70	Princeton Meadows	2.2 pCi/L	0.6× under
71	Clifton	2.2 pCi/L	0.6× under
72	East Freehold	2.2 pCi/L	0.6× under
73	Lake Mohawk	2.2 pCi/L	0.6× under
74	Stanhope	2.2 pCi/L	0.6× under
75	Washington	2.2 pCi/L	0.6× under
76	Englishtown	2.2 pCi/L	0.5× under
77	Bridgewater	2.2 pCi/L	0.5× under
78	Gladstone	2.2 pCi/L	0.5× under
79	Fair Haven	2.2 pCi/L	0.5× under
80	Hardwick	2.1 pCi/L	0.5× under
81	Springdale	2.1 pCi/L	0.5× under
82	Essex Fells	2.1 pCi/L	0.5× under
83	Victory Gardens	2.1 pCi/L	0.5× under
84	Bedminster	2.1 pCi/L	0.5× under
85	Dunellen	2.1 pCi/L	0.5× under
86	Kinnelon	2.1 pCi/L	0.5× under
87	Hawthorne	2.1 pCi/L	0.5× under
88	Hopatcong	2.1 pCi/L	0.5× under
89	Kenilworth	2.1 pCi/L	0.5× under
90	Ashland	2.1 pCi/L	0.5× under
91	Bradley Gardens	2.1 pCi/L	0.5× under
92	Union City	2.1 pCi/L	0.5× under
93	Morristown	2.0 pCi/L	0.5× under
94	Lakehurst	2.0 pCi/L	0.5× under
95	Paulsboro	2.0 pCi/L	0.5× under
96	Succasunna	2.0 pCi/L	0.5× under
97	Bayonne	2.0 pCi/L	0.5× under
98	Kendall Park	2.0 pCi/L	0.5× under
99	Boonton	2.0 pCi/L	0.5× under
100	Rumson	2.0 pCi/L	0.5× under
101	Sicklerville	2.0 pCi/L	0.5× under
102	Brookdale	2.0 pCi/L	0.5× under
103	Lambertville	2.0 pCi/L	0.5× under
104	North Plainfield	2.0 pCi/L	0.5× under
105	Weston	2.0 pCi/L	0.5× under
106	Willingboro	2.0 pCi/L	0.5× under
107	Blackwood	2.0 pCi/L	0.5× under
108	Lincroft	2.0 pCi/L	0.5× under
109	Marlboro	1.9 pCi/L	0.5× under
110	Maywood	1.9 pCi/L	0.5× under
111	Magnolia	1.9 pCi/L	0.5× under
112	Tinton Falls	1.9 pCi/L	0.5× under
113	Glen Ridge	1.9 pCi/L	0.5× under
114	Newfield	1.9 pCi/L	0.5× under
115	Berkeley Heights	1.9 pCi/L	0.5× under
116	Ocean Acres	1.9 pCi/L	0.5× under
117	Gibbsboro	1.9 pCi/L	0.5× under
118	Lincoln Park	1.9 pCi/L	0.5× under
119	Morganville	1.9 pCi/L	0.5× under
120	Mendham	1.9 pCi/L	0.5× under
121	Mullica Hill	1.9 pCi/L	0.5× under
122	Woodstown	1.9 pCi/L	0.5× under
123	Linwood	1.9 pCi/L	0.5× under
124	North Haledon	1.9 pCi/L	0.5× under
125	Williamstown	1.9 pCi/L	0.5× under
126	Midland Park	1.8 pCi/L	0.5× under
127	Watchung	1.8 pCi/L	0.5× under
128	Vineland	1.8 pCi/L	0.4× under
129	Allentown	1.8 pCi/L	0.4× under
130	Woodbury Heights	1.8 pCi/L	0.4× under
131	Metuchen	1.8 pCi/L	0.4× under
132	Princeton Junction	1.8 pCi/L	0.4× under
133	Laurel Springs	1.8 pCi/L	0.4× under
134	Moorestown-Lenola	1.8 pCi/L	0.4× under
135	Green Knoll	1.7 pCi/L	0.4× under
136	Milford	1.7 pCi/L	0.4× under
137	Lake Telemark	1.7 pCi/L	0.4× under
138	Princeton	1.7 pCi/L	0.4× under
139	Randolph	1.7 pCi/L	0.4× under
140	East Brunswick	1.7 pCi/L	0.4× under
141	Mahwah	1.7 pCi/L	0.4× under
142	Cranford	1.7 pCi/L	0.4× under
143	Franklin Lakes	1.7 pCi/L	0.4× under
144	Kenvil	1.7 pCi/L	0.4× under
145	South Bound Brook	1.7 pCi/L	0.4× under
146	Concordia	1.7 pCi/L	0.4× under
147	Lawrenceville	1.7 pCi/L	0.4× under
148	Morris Plains	1.7 pCi/L	0.4× under
149	Ringwood	1.7 pCi/L	0.4× under
150	Fairfield	1.6 pCi/L	0.4× under
151	Lyndhurst	1.6 pCi/L	0.4× under
152	Dayton	1.6 pCi/L	0.4× under
153	Budd Lake	1.6 pCi/L	0.4× under
154	Delanco	1.6 pCi/L	0.4× under
155	Old Bridge	1.6 pCi/L	0.4× under
156	Prospect Park	1.6 pCi/L	0.4× under
157	Red Bank	1.6 pCi/L	0.4× under
158	Woodcliff Lake	1.6 pCi/L	0.4× under
159	Wyckoff	1.6 pCi/L	0.4× under
160	River Edge	1.6 pCi/L	0.4× under
161	Turnersville	1.6 pCi/L	0.4× under
162	Whittingham	1.6 pCi/L	0.4× under
163	Ellisburg	1.6 pCi/L	0.4× under
164	Medford Lakes	1.6 pCi/L	0.4× under
165	Vista Center	1.6 pCi/L	0.4× under
166	Madison Park	1.6 pCi/L	0.4× under
167	Milltown	1.6 pCi/L	0.4× under
168	Rossmoor	1.6 pCi/L	0.4× under
169	Wanamassa	1.6 pCi/L	0.4× under
170	Roselle Park	1.5 pCi/L	0.4× under
171	Maple Shade	1.5 pCi/L	0.4× under
172	Yorketown	1.5 pCi/L	0.4× under
173	Farmingdale	1.5 pCi/L	0.4× under
174	Rutherford	1.5 pCi/L	0.4× under
175	Alpha	1.5 pCi/L	0.4× under
176	East Hanover	1.5 pCi/L	0.4× under
177	New Egypt	1.5 pCi/L	0.4× under
178	Plainsboro Center	1.5 pCi/L	0.4× under
179	Haworth	1.5 pCi/L	0.4× under
180	Mercerville	1.5 pCi/L	0.4× under
181	Plainfield	1.5 pCi/L	0.4× under
182	Short Hills	1.5 pCi/L	0.4× under
183	Haddonfield	1.5 pCi/L	0.4× under
184	Elizabeth	1.5 pCi/L	0.4× under
185	South Plainfield	1.5 pCi/L	0.4× under
186	Tenafly	1.5 pCi/L	0.4× under
187	Audubon	1.4 pCi/L	0.4× under
188	Somerville	1.4 pCi/L	0.4× under
189	Closter	1.4 pCi/L	0.4× under
190	Greentree	1.4 pCi/L	0.4× under
191	Glen Rock	1.4 pCi/L	0.4× under
192	Manville	1.4 pCi/L	0.4× under
193	Berlin	1.4 pCi/L	0.4× under
194	Livingston	1.4 pCi/L	0.4× under
195	Iselin	1.4 pCi/L	0.3× under
196	Ogdensburg	1.4 pCi/L	0.3× under
197	River Vale	1.4 pCi/L	0.3× under
198	Cresskill	1.4 pCi/L	0.3× under
199	Madison	1.4 pCi/L	0.3× under
200	Park Ridge	1.4 pCi/L	0.3× under
201	Leonia	1.4 pCi/L	0.3× under
202	Riverton	1.4 pCi/L	0.3× under
203	Cliffside Park	1.4 pCi/L	0.3× under
204	Twin Rivers	1.3 pCi/L	0.3× under
205	High Bridge	1.3 pCi/L	0.3× under
206	Westfield	1.3 pCi/L	0.3× under
207	Paramus	1.3 pCi/L	0.3× under
208	Caldwell	1.3 pCi/L	0.3× under
209	Fanwood	1.3 pCi/L	0.3× under
210	Little Silver	1.3 pCi/L	0.3× under
211	Allendale	1.3 pCi/L	0.3× under
212	Burlington	1.3 pCi/L	0.3× under
213	Eatontown	1.3 pCi/L	0.3× under
214	Upper Saddle River	1.3 pCi/L	0.3× under
215	Montclair	1.3 pCi/L	0.3× under
216	Riverdale	1.3 pCi/L	0.3× under
217	Upper Montclair	1.3 pCi/L	0.3× under
218	Fairview	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	Matawan	1.2 pCi/L	0.3× under
228	Roselle	1.2 pCi/L	0.3× under
229	Springfield	1.2 pCi/L	0.3× under
230	Bergenfield	1.2 pCi/L	0.3× under
231	Bordentown	1.2 pCi/L	0.3× under
232	South Vineland	1.2 pCi/L	0.3× under
233	Wharton	1.2 pCi/L	0.3× under
234	Dumont	1.2 pCi/L	0.3× under
235	Mount Arlington	1.2 pCi/L	0.3× under
236	Mount Laurel	1.2 pCi/L	0.3× under
237	Northfield	1.2 pCi/L	0.3× under
238	West Orange	1.2 pCi/L	0.3× under
239	Hanover	1.2 pCi/L	0.3× under
240	Clearbrook Park	1.2 pCi/L	0.3× under
241	Ho-Ho-Kus	1.2 pCi/L	0.3× under
242	Old Tappan	1.2 pCi/L	0.3× under
243	Woodbridge	1.2 pCi/L	0.3× under
244	North Caldwell	1.2 pCi/L	0.3× under
245	Trenton	1.2 pCi/L	0.3× under
246	Demarest	1.1 pCi/L	0.3× under
247	Glendora	1.1 pCi/L	0.3× under
248	National Park	1.1 pCi/L	0.3× under
249	Somerset	1.1 pCi/L	0.3× under
250	Harrington Park	1.1 pCi/L	0.3× under
251	Nutley	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	South Orange	1.1 pCi/L	0.3× under
256	Ridgewood	1.1 pCi/L	0.3× under
257	Heathcote	1.1 pCi/L	0.3× under
258	Robbinsville	1.1 pCi/L	0.3× under
259	Teaneck	1.1 pCi/L	0.3× under
260	Victory Lakes	1.1 pCi/L	0.3× under
261	Woodland Park	1.1 pCi/L	0.3× under
262	Bloomfield	1.1 pCi/L	0.3× under
263	Ocean Gate	1.1 pCi/L	0.3× under
264	Parsippany	1.1 pCi/L	0.3× under
265	Florham Park	1.1 pCi/L	0.3× under
266	Bound Brook	1.1 pCi/L	0.3× under
267	Garfield	1.1 pCi/L	0.3× under
268	Jackson	1.1 pCi/L	0.3× under
269	Manasquan	1.1 pCi/L	0.3× under
270	Wood-Ridge	1.1 pCi/L	0.3× under
271	Chatham	1.0 pCi/L	0.3× under
272	Manahawkin	1.0 pCi/L	0.3× under
273	Winfield	1.0 pCi/L	0.3× under
274	Cherry Hill Mall	1.0 pCi/L	0.3× under
275	Passaic	1.0 pCi/L	0.3× under
276	Carlstadt	1.0 pCi/L	0.3× under
277	Mountainside	1.0 pCi/L	0.3× under
278	Raritan	1.0 pCi/L	0.3× under
279	New Providence	1.0 pCi/L	0.3× under
280	Orange	1.0 pCi/L	0.3× under
281	Ramtown	1.0 pCi/L	0.2× under
282	Saddle Brook	1.0 pCi/L	0.2× under
283	Northvale	1.0 pCi/L	0.2× under
284	Palmyra	1.0 pCi/L	0.2× under
285	Smithville	1.0 pCi/L	0.2× under
286	Verona	1.0 pCi/L	0.2× under
287	Atlantic Highlands	0.9 pCi/L	0.2× under
288	Fair Lawn	0.9 pCi/L	0.2× under
289	North Arlington	0.9 pCi/L	0.2× under
290	North Bergen	0.9 pCi/L	0.2× under
291	Camden	0.9 pCi/L	0.2× under
292	Irvington	0.9 pCi/L	0.2× under
293	Maplewood	0.9 pCi/L	0.2× under
294	Hillsdale	0.9 pCi/L	0.2× under
295	New Milford	0.9 pCi/L	0.2× under
296	Ramsey	0.9 pCi/L	0.2× under
297	Saddle River	0.9 pCi/L	0.2× under
298	Annandale	0.9 pCi/L	0.2× under
299	Oradell	0.9 pCi/L	0.2× under
300	Pennsauken	0.9 pCi/L	0.2× under
301	White Horse	0.9 pCi/L	0.2× under
302	Brooklawn	0.9 pCi/L	0.2× under
303	Somers Point	0.9 pCi/L	0.2× under
304	Fort Lee	0.9 pCi/L	0.2× under
305	Wallington	0.8 pCi/L	0.2× under
306	Hammonton	0.8 pCi/L	0.2× under
307	Harrison	0.8 pCi/L	0.2× under
308	Collingswood	0.8 pCi/L	0.2× under
309	Union	0.8 pCi/L	0.2× under
310	Egg Harbor City	0.8 pCi/L	0.2× under
311	Belleville	0.8 pCi/L	0.2× under
312	Roseland	0.8 pCi/L	0.2× under
313	Summit	0.8 pCi/L	0.2× under
314	Norwood	0.8 pCi/L	0.2× under
315	Englewood	0.7 pCi/L	0.2× under
316	Westville	0.7 pCi/L	0.2× under
317	Cherry Hill	0.7 pCi/L	0.2× under
318	Garwood	0.7 pCi/L	0.2× under
319	Marlton	0.7 pCi/L	0.2× under
320	Ridgefield Park	0.7 pCi/L	0.2× under
321	Carteret	0.7 pCi/L	0.2× under
322	Newark	0.7 pCi/L	0.2× under
323	Shark River Hills	0.7 pCi/L	0.2× under
324	Keyport	0.7 pCi/L	0.2× under
325	South Amboy	0.7 pCi/L	0.2× under
326	Ridgefield	0.7 pCi/L	0.2× under
327	Fords	0.7 pCi/L	0.2× under
328	Secaucus	0.6 pCi/L	0.2× under
329	Golden Triangle	0.6 pCi/L	0.2× under
330	Guttenberg	0.6 pCi/L	0.2× under
331	Hoboken	0.6 pCi/L	0.1× under
332	Leisure Village East	0.6 pCi/L	0.1× under
333	Jersey City	0.6 pCi/L	0.1× under
334	Keansburg	0.5 pCi/L	0.1× under
335	Brownville	0.5 pCi/L	0.1× under
336	Weehawken	0.5 pCi/L	0.1× under
337	Lakewood	0.5 pCi/L	0.1× under
338	Gibbstown	0.5 pCi/L	0.1× under
339	Hackensack	0.4 pCi/L	0.1× under
340	Port Monmouth	0.4 pCi/L	0.1× under

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