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 310 cities.

Updated August 16, 2026

Highest city

9.0pCi/L

Belvidere

New Jersey city average

1.7pCi/L

across 310 cities

Above action level

8/ 310

cities

New Jersey Cities Ranked by Indoor Radon Levels
#	Location	Avg level	Monitors	vs action level
1	Belvidere	9.0 pCi/L	10	2.3× over
2	Hasbrouck Heights	8.7 pCi/L	7	2.2× over
3	Highland Lake	5.7 pCi/L	9	1.4× over
4	Frenchtown	4.9 pCi/L	12	1.2× over
5	Alpine	4.7 pCi/L	6	1.2× over
6	Hampton	4.6 pCi/L	17	1.1× over
7	Swedesboro	4.5 pCi/L	26	1.1× over
8	Phillipsburg	4.2 pCi/L	29	1.1× over
✓ Below EPA action level (4 pCi/L)
9	Mount Holly	4.0 pCi/L	54	1.0× under
10	Hopewell	3.8 pCi/L	41	1.0× under
11	Oakhurst	3.8 pCi/L	9	0.9× under
12	Ewing	3.7 pCi/L	16	0.9× under
13	West Freehold	3.6 pCi/L	35	0.9× under
14	Hamburg	3.6 pCi/L	7	0.9× under
15	Clinton	3.3 pCi/L	24	0.8× under
16	Groveville	3.2 pCi/L	9	0.8× under
17	Pine Hill	3.1 pCi/L	8	0.8× under
18	Rockaway	3.1 pCi/L	28	0.8× under
19	Freehold	3.1 pCi/L	36	0.8× under
20	Long Valley	3.0 pCi/L	30	0.8× under
21	Scotch Plains	2.9 pCi/L	15	0.7× under
22	Wanaque	2.9 pCi/L	8	0.7× under
23	Newton	2.9 pCi/L	32	0.7× under
24	Ten Mile Run	2.8 pCi/L	27	0.7× under
25	Montvale	2.8 pCi/L	10	0.7× under
26	Beattystown	2.8 pCi/L	9	0.7× under
27	Middlebush	2.8 pCi/L	28	0.7× under
28	Wenonah	2.8 pCi/L	13	0.7× under
29	Kingston	2.7 pCi/L	33	0.7× under
30	West Milford	2.7 pCi/L	27	0.7× under
31	Beckett	2.6 pCi/L	6	0.7× under
32	Hightstown	2.6 pCi/L	17	0.7× under
33	Mountain Lakes	2.6 pCi/L	28	0.7× under
34	Oak Valley	2.6 pCi/L	15	0.7× under
35	Butler	2.6 pCi/L	9	0.7× under
36	Waldwick	2.6 pCi/L	8	0.7× under
37	Washington	2.6 pCi/L	7	0.6× under
38	Lebanon	2.5 pCi/L	15	0.6× under
39	Middlesex	2.5 pCi/L	8	0.6× under
40	Warren Township	2.5 pCi/L	42	0.6× under
41	Flemington	2.5 pCi/L	84	0.6× under
42	Highland Park	2.5 pCi/L	17	0.6× under
43	Shrewsbury	2.5 pCi/L	14	0.6× under
44	Pompton Lakes	2.5 pCi/L	9	0.6× under
45	Strathmore	2.5 pCi/L	44	0.6× under
46	Sussex	2.5 pCi/L	15	0.6× under
47	Jamesburg	2.5 pCi/L	6	0.6× under
48	Bernardsville	2.4 pCi/L	104	0.6× under
49	White Meadow Lake	2.4 pCi/L	14	0.6× under
50	Wayne	2.4 pCi/L	34	0.6× under
51	Martinsville	2.4 pCi/L	27	0.6× under
52	Califon	2.4 pCi/L	17	0.6× under
53	Chester	2.3 pCi/L	21	0.6× under
54	Clayton	2.3 pCi/L	12	0.6× under
55	Hillside	2.3 pCi/L	8	0.6× under
56	Bloomingdale	2.3 pCi/L	109	0.6× under
57	Edison	2.3 pCi/L	14	0.6× under
58	Robertsville	2.3 pCi/L	32	0.6× under
59	Society Hill	2.3 pCi/L	26	0.6× under
60	Clark	2.3 pCi/L	19	0.6× under
61	Gladstone	2.3 pCi/L	8	0.6× under
62	Whitehouse Station	2.3 pCi/L	41	0.6× under
63	Pennington	2.2 pCi/L	42	0.6× under
64	Clifton	2.2 pCi/L	14	0.6× under
65	Lake Mohawk	2.2 pCi/L	35	0.6× under
66	Englishtown	2.2 pCi/L	28	0.6× under
67	Stanhope	2.2 pCi/L	18	0.6× under
68	Essex Fells	2.2 pCi/L	9	0.6× under
69	North Plainfield	2.2 pCi/L	9	0.5× under
70	Bridgewater	2.2 pCi/L	32	0.5× under
71	East Freehold	2.2 pCi/L	37	0.5× under
72	Fair Haven	2.2 pCi/L	19	0.5× under
73	Hardwick	2.1 pCi/L	23	0.5× under
74	Springdale	2.1 pCi/L	9	0.5× under
75	Victory Gardens	2.1 pCi/L	16	0.5× under
76	Dunellen	2.1 pCi/L	20	0.5× under
77	South River	2.1 pCi/L	17	0.5× under
78	Paulsboro	2.1 pCi/L	17	0.5× under
79	Rumson	2.1 pCi/L	14	0.5× under
80	Bradley Gardens	2.1 pCi/L	34	0.5× under
81	Bayonne	2.1 pCi/L	33	0.5× under
82	Hawthorne	2.1 pCi/L	7	0.5× under
83	Hopatcong	2.1 pCi/L	18	0.5× under
84	Kinnelon	2.1 pCi/L	39	0.5× under
85	Lakehurst	2.1 pCi/L	21	0.5× under
86	Morristown	2.1 pCi/L	56	0.5× under
87	Ashland	2.1 pCi/L	6	0.5× under
88	Succasunna	2.1 pCi/L	14	0.5× under
89	Union City	2.1 pCi/L	6	0.5× under
90	Bedminster	2.0 pCi/L	21	0.5× under
91	Brookdale	2.0 pCi/L	13	0.5× under
92	Kendall Park	2.0 pCi/L	36	0.5× under
93	Tinton Falls	2.0 pCi/L	10	0.5× under
94	Boonton	2.0 pCi/L	42	0.5× under
95	Sicklerville	2.0 pCi/L	11	0.5× under
96	Willingboro	2.0 pCi/L	9	0.5× under
97	Blackwood	2.0 pCi/L	17	0.5× under
98	Lambertville	2.0 pCi/L	23	0.5× under
99	Lincroft	2.0 pCi/L	27	0.5× under
100	Hackettstown	1.9 pCi/L	33	0.5× under
101	Maywood	1.9 pCi/L	10	0.5× under
102	Marlboro	1.9 pCi/L	49	0.5× under
103	Glen Ridge	1.9 pCi/L	24	0.5× under
104	Newfield	1.9 pCi/L	7	0.5× under
105	Lincoln Park	1.9 pCi/L	19	0.5× under
106	Mendham	1.9 pCi/L	31	0.5× under
107	Morganville	1.9 pCi/L	26	0.5× under
108	Ocean Acres	1.9 pCi/L	7	0.5× under
109	Berkeley Heights	1.9 pCi/L	57	0.5× under
110	Gibbsboro	1.9 pCi/L	8	0.5× under
111	Mullica Hill	1.9 pCi/L	40	0.5× under
112	Weston	1.9 pCi/L	10	0.5× under
113	Linwood	1.9 pCi/L	6	0.5× under
114	North Haledon	1.9 pCi/L	15	0.5× under
115	Williamstown	1.9 pCi/L	13	0.5× under
116	Midland Park	1.8 pCi/L	17	0.5× under
117	Moorestown-Lenola	1.8 pCi/L	28	0.5× under
118	Princeton Junction	1.8 pCi/L	57	0.4× under
119	Vineland	1.8 pCi/L	8	0.4× under
120	Allentown	1.8 pCi/L	8	0.4× under
121	Woodbury Heights	1.8 pCi/L	8	0.4× under
122	Metuchen	1.8 pCi/L	51	0.4× under
123	Milford	1.8 pCi/L	13	0.4× under
124	Princeton	1.8 pCi/L	126	0.4× under
125	Randolph	1.8 pCi/L	47	0.4× under
126	Watchung	1.8 pCi/L	23	0.4× under
127	Cranford	1.7 pCi/L	11	0.4× under
128	Lake Telemark	1.7 pCi/L	24	0.4× under
129	Lawrenceville	1.7 pCi/L	44	0.4× under
130	East Brunswick	1.7 pCi/L	34	0.4× under
131	Prospect Park	1.7 pCi/L	8	0.4× under
132	Green Knoll	1.7 pCi/L	44	0.4× under
133	Turnersville	1.7 pCi/L	7	0.4× under
134	Franklin Lakes	1.7 pCi/L	32	0.4× under
135	Delanco	1.7 pCi/L	9	0.4× under
136	Kenvil	1.7 pCi/L	6	0.4× under
137	South Bound Brook	1.7 pCi/L	12	0.4× under
138	Concordia	1.7 pCi/L	7	0.4× under
139	Morris Plains	1.7 pCi/L	39	0.4× under
140	Woodcliff Lake	1.7 pCi/L	8	0.4× under
141	Ringwood	1.7 pCi/L	15	0.4× under
142	Fairfield	1.6 pCi/L	7	0.4× under
143	Lyndhurst	1.6 pCi/L	9	0.4× under
144	Old Bridge	1.6 pCi/L	10	0.4× under
145	Budd Lake	1.6 pCi/L	35	0.4× under
146	Whittingham	1.6 pCi/L	19	0.4× under
147	Ellisburg	1.6 pCi/L	14	0.4× under
148	Mahwah	1.6 pCi/L	23	0.4× under
149	Brass Castle	1.6 pCi/L	8	0.4× under
150	Dayton	1.6 pCi/L	15	0.4× under
151	Red Bank	1.6 pCi/L	6	0.4× under
152	Wanamassa	1.6 pCi/L	9	0.4× under
153	Vista Center	1.6 pCi/L	18	0.4× under
154	Wyckoff	1.6 pCi/L	24	0.4× under
155	River Edge	1.6 pCi/L	21	0.4× under
156	Somerset	1.6 pCi/L	17	0.4× under
157	Medford Lakes	1.6 pCi/L	30	0.4× under
158	Madison Park	1.6 pCi/L	14	0.4× under
159	Milltown	1.6 pCi/L	22	0.4× under
160	Rutherford	1.6 pCi/L	14	0.4× under
161	Yorketown	1.5 pCi/L	34	0.4× under
162	Farmingdale	1.5 pCi/L	14	0.4× under
163	Somerville	1.5 pCi/L	10	0.4× under
164	Alpha	1.5 pCi/L	14	0.4× under
165	Plainsboro Center	1.5 pCi/L	15	0.4× under
166	Haworth	1.5 pCi/L	14	0.4× under
167	Mercerville	1.5 pCi/L	9	0.4× under
168	Haddonfield	1.5 pCi/L	24	0.4× under
169	Short Hills	1.5 pCi/L	33	0.4× under
170	Tenafly	1.5 pCi/L	55	0.4× under
171	South Plainfield	1.5 pCi/L	21	0.4× under
172	Audubon	1.4 pCi/L	13	0.4× under
173	Closter	1.4 pCi/L	10	0.4× under
174	East Hanover	1.4 pCi/L	13	0.4× under
175	Greentree	1.4 pCi/L	17	0.4× under
176	Livingston	1.4 pCi/L	43	0.4× under
177	Ogdensburg	1.4 pCi/L	13	0.4× under
178	Glen Rock	1.4 pCi/L	27	0.4× under
179	Manville	1.4 pCi/L	6	0.4× under
180	Berlin	1.4 pCi/L	19	0.4× under
181	Iselin	1.4 pCi/L	35	0.3× under
182	River Vale	1.4 pCi/L	8	0.3× under
183	Cresskill	1.4 pCi/L	13	0.3× under
184	Madison	1.4 pCi/L	41	0.3× under
185	Upper Saddle River	1.4 pCi/L	23	0.3× under
186	Matawan	1.4 pCi/L	10	0.3× under
187	Riverton	1.4 pCi/L	7	0.3× under
188	Cliffside Park	1.4 pCi/L	9	0.3× under
189	Park Ridge	1.4 pCi/L	22	0.3× under
190	High Bridge	1.3 pCi/L	16	0.3× under
191	Little Silver	1.3 pCi/L	12	0.3× under
192	Montclair	1.3 pCi/L	36	0.3× under
193	Upper Montclair	1.3 pCi/L	19	0.3× under
194	Caldwell	1.3 pCi/L	17	0.3× under
195	Paramus	1.3 pCi/L	26	0.3× under
196	Fairview	1.3 pCi/L	31	0.3× under
197	Twin Rivers	1.3 pCi/L	21	0.3× under
198	Westfield	1.3 pCi/L	47	0.3× under
199	Allendale	1.3 pCi/L	8	0.3× under
200	Burlington	1.3 pCi/L	7	0.3× under
201	Riverdale	1.3 pCi/L	8	0.3× under
202	Linden	1.3 pCi/L	12	0.3× under
203	Edgewater	1.3 pCi/L	25	0.3× under
204	New Brunswick	1.3 pCi/L	6	0.3× under
205	Oakland	1.3 pCi/L	19	0.3× under
206	Pitman	1.3 pCi/L	15	0.3× under
207	Englewood Cliffs	1.3 pCi/L	19	0.3× under
208	Piscataway	1.3 pCi/L	12	0.3× under
209	Totowa	1.3 pCi/L	10	0.3× under
210	Roselle	1.2 pCi/L	13	0.3× under
211	Springfield	1.2 pCi/L	21	0.3× under
212	Bergenfield	1.2 pCi/L	11	0.3× under
213	Leonia	1.2 pCi/L	19	0.3× under
214	Bordentown	1.2 pCi/L	15	0.3× under
215	South Vineland	1.2 pCi/L	6	0.3× under
216	Mount Arlington	1.2 pCi/L	18	0.3× under
217	Mount Laurel	1.2 pCi/L	26	0.3× under
218	Northfield	1.2 pCi/L	25	0.3× under
219	West Orange	1.2 pCi/L	29	0.3× under
220	Clearbrook Park	1.2 pCi/L	8	0.3× under
221	Dumont	1.2 pCi/L	20	0.3× under
222	Demarest	1.2 pCi/L	17	0.3× under
223	Ho-Ho-Kus	1.2 pCi/L	16	0.3× under
224	Old Tappan	1.2 pCi/L	21	0.3× under
225	Woodbridge	1.2 pCi/L	6	0.3× under
226	North Caldwell	1.2 pCi/L	15	0.3× under
227	Trenton	1.2 pCi/L	6	0.3× under
228	Glendora	1.1 pCi/L	7	0.3× under
229	South Orange	1.1 pCi/L	31	0.3× under
230	Fanwood	1.1 pCi/L	41	0.3× under
231	Florham Park	1.1 pCi/L	9	0.3× under
232	Harrington Park	1.1 pCi/L	12	0.3× under
233	Teaneck	1.1 pCi/L	11	0.3× under
234	Spotswood	1.1 pCi/L	9	0.3× under
235	Cedar Grove	1.1 pCi/L	17	0.3× under
236	Roebling	1.1 pCi/L	8	0.3× under
237	Ridgewood	1.1 pCi/L	31	0.3× under
238	Robbinsville	1.1 pCi/L	16	0.3× under
239	Woodland Park	1.1 pCi/L	8	0.3× under
240	Bloomfield	1.1 pCi/L	16	0.3× under
241	Chatham	1.1 pCi/L	23	0.3× under
242	Bound Brook	1.1 pCi/L	9	0.3× under
243	Parsippany	1.1 pCi/L	32	0.3× under
244	Passaic	1.1 pCi/L	18	0.3× under
245	Garfield	1.1 pCi/L	6	0.3× under
246	Manasquan	1.1 pCi/L	8	0.3× under
247	Wood-Ridge	1.1 pCi/L	7	0.3× under
248	Nutley	1.0 pCi/L	14	0.3× under
249	Winfield	1.0 pCi/L	8	0.3× under
250	Cherry Hill Mall	1.0 pCi/L	9	0.3× under
251	Carlstadt	1.0 pCi/L	6	0.3× under
252	Hanover	1.0 pCi/L	7	0.3× under
253	Raritan	1.0 pCi/L	11	0.3× under
254	Heathcote	1.0 pCi/L	16	0.3× under
255	New Providence	1.0 pCi/L	71	0.3× under
256	Orange	1.0 pCi/L	8	0.3× under
257	Mountainside	1.0 pCi/L	22	0.2× under
258	Ramtown	1.0 pCi/L	7	0.2× under
259	Saddle Brook	1.0 pCi/L	11	0.2× under
260	Palmyra	1.0 pCi/L	7	0.2× under
261	Smithville	1.0 pCi/L	7	0.2× under
262	Jackson	1.0 pCi/L	7	0.2× under
263	Verona	1.0 pCi/L	20	0.2× under
264	Hillsdale	0.9 pCi/L	11	0.2× under
265	Atlantic Highlands	0.9 pCi/L	7	0.2× under
266	Fair Lawn	0.9 pCi/L	36	0.2× under
267	North Bergen	0.9 pCi/L	7	0.2× under
268	Camden	0.9 pCi/L	10	0.2× under
269	Irvington	0.9 pCi/L	6	0.2× under
270	Maplewood	0.9 pCi/L	41	0.2× under
271	Ramsey	0.9 pCi/L	11	0.2× under
272	Annandale	0.9 pCi/L	6	0.2× under
273	Oradell	0.9 pCi/L	18	0.2× under
274	Saddle River	0.9 pCi/L	11	0.2× under
275	Somers Point	0.9 pCi/L	9	0.2× under
276	Fort Lee	0.8 pCi/L	21	0.2× under
277	New Milford	0.8 pCi/L	12	0.2× under
278	Harrison	0.8 pCi/L	6	0.2× under
279	Collingswood	0.8 pCi/L	8	0.2× under
280	Union	0.8 pCi/L	11	0.2× under
281	Norwood	0.8 pCi/L	7	0.2× under
282	Roseland	0.8 pCi/L	10	0.2× under
283	Englewood	0.8 pCi/L	9	0.2× under
284	Summit	0.8 pCi/L	31	0.2× under
285	Belleville	0.7 pCi/L	6	0.2× under
286	Garwood	0.7 pCi/L	18	0.2× under
287	Shark River Hills	0.7 pCi/L	8	0.2× under
288	Westville	0.7 pCi/L	7	0.2× under
289	Cherry Hill	0.7 pCi/L	7	0.2× under
290	Marlton	0.7 pCi/L	17	0.2× under
291	Carteret	0.7 pCi/L	9	0.2× under
292	Newark	0.7 pCi/L	11	0.2× under
293	Keyport	0.7 pCi/L	8	0.2× under
294	South Amboy	0.7 pCi/L	12	0.2× under
295	Ridgefield	0.7 pCi/L	7	0.2× under
296	Secaucus	0.7 pCi/L	11	0.2× under
297	Elizabeth	0.7 pCi/L	6	0.2× under
298	Fords	0.7 pCi/L	14	0.2× under
299	Pennsauken	0.7 pCi/L	6	0.2× under
300	Guttenberg	0.6 pCi/L	39	0.2× under
301	Golden Triangle	0.6 pCi/L	14	0.2× under
302	Leisure Village East	0.6 pCi/L	12	0.2× under
303	Hoboken	0.6 pCi/L	139	0.1× under
304	Jersey City	0.6 pCi/L	24	0.1× under
305	Keansburg	0.5 pCi/L	7	0.1× under
306	Brownville	0.5 pCi/L	13	0.1× under
307	Weehawken	0.5 pCi/L	66	0.1× under
308	Lakewood	0.5 pCi/L	9	0.1× under
309	Hackensack	0.4 pCi/L	14	0.1× under
310	Port Monmouth	0.4 pCi/L	7	0.1× under

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