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 343 cities.

Updated October 19, 2026

Highest city

9.0pCi/L

Belvidere

New Jersey city average

1.7pCi/L

across 343 cities

Above action level

8/ 343

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	4.8 pCi/L	1.2× over
6	Hampton	4.4 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	Crandon Lakes	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	Ewing	3.6 pCi/L	0.9× under
15	Oakhurst	3.6 pCi/L	0.9× under
16	Hackettstown	3.3 pCi/L	0.8× under
17	Groveville	3.2 pCi/L	0.8× under
18	Pine Hill	3.1 pCi/L	0.8× under
19	Clinton	3.1 pCi/L	0.8× under
20	Rockaway	3.1 pCi/L	0.8× under
21	Wenonah	3.0 pCi/L	0.8× under
22	Long Valley	2.9 pCi/L	0.7× under
23	Scotch Plains	2.9 pCi/L	0.7× under
24	Wanaque	2.9 pCi/L	0.7× under
25	Freehold	2.9 pCi/L	0.7× under
26	Ten Mile Run	2.9 pCi/L	0.7× under
27	Montvale	2.8 pCi/L	0.7× under
28	Echelon	2.8 pCi/L	0.7× under
29	Newton	2.8 pCi/L	0.7× under
30	Hopatcong Hills	2.8 pCi/L	0.7× under
31	Middlebush	2.7 pCi/L	0.7× under
32	Kingston	2.7 pCi/L	0.7× under
33	Beattystown	2.6 pCi/L	0.7× under
34	Beckett	2.6 pCi/L	0.7× under
35	West Milford	2.6 pCi/L	0.7× under
36	Butler	2.6 pCi/L	0.7× under
37	Mountain Lakes	2.6 pCi/L	0.6× under
38	Oak Valley	2.5 pCi/L	0.6× under
39	Warren Township	2.5 pCi/L	0.6× under
40	Lebanon	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	Hightstown	2.5 pCi/L	0.6× under
44	Pompton Lakes	2.5 pCi/L	0.6× under
45	Waldwick	2.5 pCi/L	0.6× under
46	Chesilhurst	2.5 pCi/L	0.6× under
47	Highland Park	2.5 pCi/L	0.6× under
48	Jamesburg	2.5 pCi/L	0.6× under
49	Flemington	2.4 pCi/L	0.6× under
50	Hillside	2.4 pCi/L	0.6× under
51	Strathmore	2.4 pCi/L	0.6× under
52	Sussex	2.4 pCi/L	0.6× under
53	White Meadow Lake	2.4 pCi/L	0.6× under
54	Martinsville	2.4 pCi/L	0.6× under
55	Califon	2.4 pCi/L	0.6× under
56	Chester	2.3 pCi/L	0.6× under
57	Clayton	2.3 pCi/L	0.6× under
58	Wayne	2.3 pCi/L	0.6× under
59	Clark	2.3 pCi/L	0.6× under
60	Monmouth Junction	2.3 pCi/L	0.6× under
61	Edison	2.3 pCi/L	0.6× under
62	Bloomingdale	2.3 pCi/L	0.6× under
63	Navesink	2.3 pCi/L	0.6× under
64	Robertsville	2.3 pCi/L	0.6× under
65	Bernardsville	2.3 pCi/L	0.6× under
66	Lake Mohawk	2.3 pCi/L	0.6× under
67	South River	2.3 pCi/L	0.6× under
68	Brass Castle	2.3 pCi/L	0.6× under
69	Society Hill	2.3 pCi/L	0.6× under
70	Whitehouse Station	2.2 pCi/L	0.6× under
71	Clifton	2.2 pCi/L	0.6× under
72	Pennington	2.2 pCi/L	0.6× under
73	Bridgewater	2.2 pCi/L	0.6× under
74	Fair Haven	2.2 pCi/L	0.6× under
75	Stanhope	2.2 pCi/L	0.6× under
76	Essex Fells	2.2 pCi/L	0.6× under
77	Bedminster	2.2 pCi/L	0.5× under
78	East Freehold	2.2 pCi/L	0.5× under
79	Englishtown	2.2 pCi/L	0.5× under
80	Gladstone	2.2 pCi/L	0.5× under
81	Princeton Meadows	2.2 pCi/L	0.5× under
82	Hardwick	2.1 pCi/L	0.5× under
83	Springdale	2.1 pCi/L	0.5× under
84	Washington	2.1 pCi/L	0.5× under
85	Bradley Gardens	2.1 pCi/L	0.5× under
86	Dunellen	2.1 pCi/L	0.5× under
87	Kinnelon	2.1 pCi/L	0.5× under
88	Victory Gardens	2.1 pCi/L	0.5× under
89	Hawthorne	2.1 pCi/L	0.5× under
90	Hopatcong	2.1 pCi/L	0.5× under
91	Kenilworth	2.1 pCi/L	0.5× under
92	Ashland	2.1 pCi/L	0.5× under
93	Union City	2.1 pCi/L	0.5× under
94	Lakehurst	2.0 pCi/L	0.5× under
95	Morristown	2.0 pCi/L	0.5× under
96	Paulsboro	2.0 pCi/L	0.5× under
97	Weston	2.0 pCi/L	0.5× under
98	Succasunna	2.0 pCi/L	0.5× under
99	Kendall Park	2.0 pCi/L	0.5× under
100	Sicklerville	2.0 pCi/L	0.5× under
101	Brookdale	2.0 pCi/L	0.5× under
102	Lambertville	2.0 pCi/L	0.5× under
103	Bayonne	2.0 pCi/L	0.5× under
104	Boonton	2.0 pCi/L	0.5× under
105	Marlboro	2.0 pCi/L	0.5× under
106	North Plainfield	2.0 pCi/L	0.5× under
107	Willingboro	2.0 pCi/L	0.5× under
108	Blackwood	2.0 pCi/L	0.5× under
109	Lincroft	2.0 pCi/L	0.5× under
110	Maywood	1.9 pCi/L	0.5× under
111	Magnolia	1.9 pCi/L	0.5× under
112	Oxford	1.9 pCi/L	0.5× under
113	Rumson	1.9 pCi/L	0.5× under
114	Tinton Falls	1.9 pCi/L	0.5× under
115	Glen Ridge	1.9 pCi/L	0.5× under
116	Newfield	1.9 pCi/L	0.5× under
117	Lincoln Park	1.9 pCi/L	0.5× under
118	Morganville	1.9 pCi/L	0.5× under
119	Ocean Acres	1.9 pCi/L	0.5× under
120	Gibbsboro	1.9 pCi/L	0.5× under
121	Berkeley Heights	1.9 pCi/L	0.5× under
122	Mendham	1.9 pCi/L	0.5× under
123	Mullica Hill	1.9 pCi/L	0.5× under
124	Woodstown	1.9 pCi/L	0.5× under
125	Linwood	1.9 pCi/L	0.5× under
126	North Haledon	1.9 pCi/L	0.5× under
127	Williamstown	1.9 pCi/L	0.5× under
128	Midland Park	1.8 pCi/L	0.5× under
129	Milford	1.8 pCi/L	0.5× under
130	Watchung	1.8 pCi/L	0.5× under
131	Vineland	1.8 pCi/L	0.4× under
132	Mahwah	1.8 pCi/L	0.4× under
133	Lake Telemark	1.8 pCi/L	0.4× under
134	Metuchen	1.8 pCi/L	0.4× under
135	Laurel Springs	1.8 pCi/L	0.4× under
136	Princeton Junction	1.7 pCi/L	0.4× under
137	Franklin Lakes	1.7 pCi/L	0.4× under
138	Moorestown-Lenola	1.7 pCi/L	0.4× under
139	Princeton	1.7 pCi/L	0.4× under
140	Randolph	1.7 pCi/L	0.4× under
141	East Brunswick	1.7 pCi/L	0.4× under
142	Green Knoll	1.7 pCi/L	0.4× under
143	Kenvil	1.7 pCi/L	0.4× under
144	South Bound Brook	1.7 pCi/L	0.4× under
145	Woodbury Heights	1.7 pCi/L	0.4× under
146	Budd Lake	1.7 pCi/L	0.4× under
147	Concordia	1.7 pCi/L	0.4× under
148	Morris Plains	1.7 pCi/L	0.4× under
149	Allentown	1.7 pCi/L	0.4× under
150	Lawrenceville	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	Dayton	1.6 pCi/L	0.4× under
155	Wyckoff	1.6 pCi/L	0.4× under
156	Delanco	1.6 pCi/L	0.4× under
157	Old Bridge	1.6 pCi/L	0.4× under
158	Prospect Park	1.6 pCi/L	0.4× under
159	Red Bank	1.6 pCi/L	0.4× under
160	Turnersville	1.6 pCi/L	0.4× under
161	River Edge	1.6 pCi/L	0.4× under
162	Whittingham	1.6 pCi/L	0.4× under
163	Caldwell	1.6 pCi/L	0.4× under
164	Ellisburg	1.6 pCi/L	0.4× under
165	Medford Lakes	1.6 pCi/L	0.4× under
166	Vista Center	1.6 pCi/L	0.4× under
167	Woodcliff Lake	1.6 pCi/L	0.4× under
168	Cranford	1.6 pCi/L	0.4× under
169	Maple Shade	1.6 pCi/L	0.4× under
170	Madison Park	1.6 pCi/L	0.4× under
171	Rossmoor	1.6 pCi/L	0.4× under
172	Milltown	1.5 pCi/L	0.4× under
173	Roselle Park	1.5 pCi/L	0.4× under
174	Short Hills	1.5 pCi/L	0.4× under
175	Yorketown	1.5 pCi/L	0.4× under
176	Farmingdale	1.5 pCi/L	0.4× under
177	Little Silver	1.5 pCi/L	0.4× under
178	Rutherford	1.5 pCi/L	0.4× under
179	Wanamassa	1.5 pCi/L	0.4× under
180	Alpha	1.5 pCi/L	0.4× under
181	East Hanover	1.5 pCi/L	0.4× under
182	New Egypt	1.5 pCi/L	0.4× under
183	Plainsboro Center	1.5 pCi/L	0.4× under
184	Haworth	1.5 pCi/L	0.4× under
185	Mercerville	1.5 pCi/L	0.4× under
186	Plainfield	1.5 pCi/L	0.4× under
187	Elizabeth	1.5 pCi/L	0.4× under
188	Tenafly	1.5 pCi/L	0.4× under
189	Audubon	1.4 pCi/L	0.4× under
190	Park Ridge	1.4 pCi/L	0.4× under
191	Somerville	1.4 pCi/L	0.4× under
192	Closter	1.4 pCi/L	0.4× under
193	Greentree	1.4 pCi/L	0.4× under
194	Haddonfield	1.4 pCi/L	0.4× under
195	Livingston	1.4 pCi/L	0.4× under
196	Manville	1.4 pCi/L	0.4× under
197	South Plainfield	1.4 pCi/L	0.4× under
198	Berlin	1.4 pCi/L	0.4× under
199	Glen Rock	1.4 pCi/L	0.3× under
200	Ogdensburg	1.4 pCi/L	0.3× under
201	Pitman	1.4 pCi/L	0.3× under
202	River Vale	1.4 pCi/L	0.3× under
203	Iselin	1.4 pCi/L	0.3× under
204	Cresskill	1.4 pCi/L	0.3× under
205	Riverton	1.4 pCi/L	0.3× under
206	Cliffside Park	1.4 pCi/L	0.3× under
207	Twin Rivers	1.3 pCi/L	0.3× under
208	High Bridge	1.3 pCi/L	0.3× under
209	Madison	1.3 pCi/L	0.3× under
210	Westfield	1.3 pCi/L	0.3× under
211	Paramus	1.3 pCi/L	0.3× under
212	Fanwood	1.3 pCi/L	0.3× under
213	Leonia	1.3 pCi/L	0.3× under
214	Allendale	1.3 pCi/L	0.3× under
215	Burlington	1.3 pCi/L	0.3× under
216	Eatontown	1.3 pCi/L	0.3× under
217	Montclair	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	Upper Saddle River	1.3 pCi/L	0.3× under
221	Edgewater	1.3 pCi/L	0.3× under
222	New Brunswick	1.3 pCi/L	0.3× under
223	Northfield	1.3 pCi/L	0.3× under
224	Oakland	1.3 pCi/L	0.3× under
225	Englewood Cliffs	1.3 pCi/L	0.3× under
226	Fairview	1.3 pCi/L	0.3× under
227	Old Tappan	1.3 pCi/L	0.3× under
228	Totowa	1.3 pCi/L	0.3× under
229	Upper Montclair	1.3 pCi/L	0.3× under
230	Roselle	1.2 pCi/L	0.3× under
231	Springfield	1.2 pCi/L	0.3× under
232	Piscataway	1.2 pCi/L	0.3× under
233	Bordentown	1.2 pCi/L	0.3× under
234	Dumont	1.2 pCi/L	0.3× under
235	South Vineland	1.2 pCi/L	0.3× under
236	West Orange	1.2 pCi/L	0.3× under
237	Wharton	1.2 pCi/L	0.3× under
238	Mount Arlington	1.2 pCi/L	0.3× under
239	Mount Laurel	1.2 pCi/L	0.3× under
240	Hanover	1.2 pCi/L	0.3× under
241	Clearbrook Park	1.2 pCi/L	0.3× under
242	Matawan	1.2 pCi/L	0.3× under
243	Bergenfield	1.2 pCi/L	0.3× under
244	Ho-Ho-Kus	1.2 pCi/L	0.3× under
245	Pennsauken	1.2 pCi/L	0.3× under
246	Woodbridge	1.2 pCi/L	0.3× under
247	North Caldwell	1.2 pCi/L	0.3× under
248	Trenton	1.2 pCi/L	0.3× under
249	Glendora	1.1 pCi/L	0.3× under
250	Harrington Park	1.1 pCi/L	0.3× under
251	National Park	1.1 pCi/L	0.3× under
252	Somerset	1.1 pCi/L	0.3× under
253	Heathcote	1.1 pCi/L	0.3× under
254	Demarest	1.1 pCi/L	0.3× under
255	Nutley	1.1 pCi/L	0.3× under
256	Ridgewood	1.1 pCi/L	0.3× under
257	Spotswood	1.1 pCi/L	0.3× under
258	Cedar Grove	1.1 pCi/L	0.3× under
259	Roebling	1.1 pCi/L	0.3× under
260	Robbinsville	1.1 pCi/L	0.3× under
261	South Orange	1.1 pCi/L	0.3× under
262	Victory Lakes	1.1 pCi/L	0.3× under
263	Woodland Park	1.1 pCi/L	0.3× under
264	Bloomfield	1.1 pCi/L	0.3× under
265	Ocean Gate	1.1 pCi/L	0.3× under
266	Parsippany	1.1 pCi/L	0.3× under
267	Florham Park	1.1 pCi/L	0.3× under
268	Teaneck	1.1 pCi/L	0.3× under
269	Bound Brook	1.1 pCi/L	0.3× under
270	Garfield	1.1 pCi/L	0.3× under
271	Jackson	1.1 pCi/L	0.3× under
272	Manasquan	1.1 pCi/L	0.3× under
273	Mountainside	1.1 pCi/L	0.3× under
274	Wood-Ridge	1.1 pCi/L	0.3× under
275	Winfield	1.0 pCi/L	0.3× under
276	Cherry Hill Mall	1.0 pCi/L	0.3× under
277	Carlstadt	1.0 pCi/L	0.3× under
278	Raritan	1.0 pCi/L	0.3× under
279	Passaic	1.0 pCi/L	0.3× under
280	Orange	1.0 pCi/L	0.3× under
281	Chatham	1.0 pCi/L	0.2× under
282	New Providence	1.0 pCi/L	0.2× under
283	Ramtown	1.0 pCi/L	0.2× under
284	Saddle Brook	1.0 pCi/L	0.2× under
285	Palmyra	1.0 pCi/L	0.2× under
286	Smithville	1.0 pCi/L	0.2× under
287	Verona	1.0 pCi/L	0.2× under
288	Manahawkin	0.9 pCi/L	0.2× under
289	Northvale	0.9 pCi/L	0.2× under
290	Atlantic Highlands	0.9 pCi/L	0.2× under
291	Fair Lawn	0.9 pCi/L	0.2× under
292	Hillsdale	0.9 pCi/L	0.2× under
293	Union	0.9 pCi/L	0.2× under
294	North Bergen	0.9 pCi/L	0.2× under
295	Camden	0.9 pCi/L	0.2× under
296	Irvington	0.9 pCi/L	0.2× under
297	Maplewood	0.9 pCi/L	0.2× under
298	North Arlington	0.9 pCi/L	0.2× under
299	Ramsey	0.9 pCi/L	0.2× under
300	Saddle River	0.9 pCi/L	0.2× under
301	Annandale	0.9 pCi/L	0.2× under
302	New Milford	0.9 pCi/L	0.2× under
303	Oradell	0.9 pCi/L	0.2× under
304	White Horse	0.9 pCi/L	0.2× under
305	Belleville	0.9 pCi/L	0.2× under
306	Brooklawn	0.9 pCi/L	0.2× under
307	Somers Point	0.9 pCi/L	0.2× under
308	Fort Lee	0.8 pCi/L	0.2× under
309	Wallington	0.8 pCi/L	0.2× under
310	Hammonton	0.8 pCi/L	0.2× under
311	Harrison	0.8 pCi/L	0.2× under
312	Collingswood	0.8 pCi/L	0.2× under
313	Egg Harbor City	0.8 pCi/L	0.2× under
314	Summit	0.8 pCi/L	0.2× under
315	Roseland	0.8 pCi/L	0.2× under
316	Norwood	0.8 pCi/L	0.2× under
317	Garwood	0.7 pCi/L	0.2× under
318	Westville	0.7 pCi/L	0.2× under
319	Cherry Hill	0.7 pCi/L	0.2× under
320	Englewood	0.7 pCi/L	0.2× under
321	Marlton	0.7 pCi/L	0.2× under
322	Ridgefield Park	0.7 pCi/L	0.2× under
323	Carteret	0.7 pCi/L	0.2× under
324	Newark	0.7 pCi/L	0.2× under
325	Keyport	0.7 pCi/L	0.2× under
326	South Amboy	0.7 pCi/L	0.2× under
327	Ridgefield	0.7 pCi/L	0.2× under
328	Fords	0.7 pCi/L	0.2× under
329	Secaucus	0.6 pCi/L	0.2× under
330	Wood-Lynne	0.6 pCi/L	0.2× under
331	Golden Triangle	0.6 pCi/L	0.2× under
332	Shark River Hills	0.6 pCi/L	0.2× under
333	Guttenberg	0.6 pCi/L	0.1× under
334	Hoboken	0.6 pCi/L	0.1× under
335	Leisure Village East	0.6 pCi/L	0.1× under
336	Jersey City	0.6 pCi/L	0.1× under
337	Keansburg	0.5 pCi/L	0.1× under
338	Brownville	0.5 pCi/L	0.1× under
339	Lakewood	0.5 pCi/L	0.1× under
340	Weehawken	0.5 pCi/L	0.1× under
341	Gibbstown	0.5 pCi/L	0.1× under
342	Hackensack	0.4 pCi/L	0.1× under
343	Port Monmouth	0.4 pCi/L	0.1× under

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