Highest Radon Risk ZIP Codes in Rhode Island

Out of 33 ZIP codes with data in Rhode Island, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All Rhode Island Rankings

Statistic	Value
ZIP codes ranked	33
Lowest value	Zone 1 (High)
Median value	Zone 1 (High)
State	Rhode Island

33 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Radon Zone	Safety Score
1	02882	Narragansett	RI	Zone 1 (High)	33/100
2	02818	East Greenwich	RI	Zone 1 (High)	35/100
3	02812	Carolina	RI	Zone 1 (High)	40/100
4	02823	Fiskeville	RI	Zone 1 (High)	40/100
5	02873	Rockville	RI	Zone 1 (High)	40/100
6	02875	Shannock	RI	Zone 1 (High)	40/100
7	02883	Peace Dale	RI	Zone 1 (High)	40/100
8	02893	West Warwick	RI	Zone 1 (High)	40/100
9	02891	Westerly	RI	Zone 1 (High)	41/100
10	02831	Hope	RI	Zone 1 (High)	45/100
11	02889	Warwick	RI	Zone 1 (High)	49/100
12	02879	Wakefield	RI	Zone 1 (High)	52/100
13	02808	Bradford	RI	Zone 1 (High)	53/100
14	02813	Charlestown	RI	Zone 1 (High)	53/100
15	02836	Kenyon	RI	Zone 1 (High)	53/100
16	02877	Slocum	RI	Zone 1 (High)	53/100
17	02894	Wood River Junction	RI	Zone 1 (High)	53/100
18	02852	North Kingstown	RI	Zone 1 (High)	54/100
19	02886	Warwick	RI	Zone 1 (High)	54/100
20	02888	Warwick	RI	Zone 1 (High)	54/100
21	02816	Coventry	RI	Zone 1 (High)	55/100
22	02833	Hopkinton	RI	Zone 1 (High)	59/100
23	02874	Saunderstown	RI	Zone 1 (High)	60/100
24	02822	Exeter	RI	Zone 1 (High)	62/100
25	02892	West Kingston	RI	Zone 1 (High)	63/100
26	02817	West Greenwich	RI	Zone 1 (High)	64/100
27	02832	Hope Valley	RI	Zone 1 (High)	64/100
28	02887	Warwick	RI	Zone 1 (High)	64/100
29	02807	Block Island	RI	Zone 1 (High)	65/100
30	02898	Wyoming	RI	Zone 1 (High)	65/100
31	02880	Wakefield	RI	Zone 1 (High)	67/100
32	02804	Ashaway	RI	Zone 1 (High)	69/100
33	02881	Kingston	RI	Zone 1 (High)	70/100

Methodology

Radon rankings are based on EPA county-level radon zone classifications. Zone 1 (highest risk) has predicted average indoor radon levels above 4 pCi/L — the EPA action level. Zone 2 is moderate (2-4 pCi/L) and Zone 3 is low (below 2 pCi/L). Within Zone 1, ZIP codes are sub-ranked by Home Safety Score to prioritize areas with compounding risk factors.

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: 2026-06-04.

Frequently Asked Questions

What is EPA Radon Zone 1?

Zone 1 is the EPA highest-risk classification, meaning the county has predicted average indoor radon levels above 4 pCi/L — the level at which the EPA recommends mitigation. Radon causes about 21,000 lung cancer deaths per year in the U.S.

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%.

Highest Radon Risk ZIP Codes in Rhode Island — 2026

33 Lowest-Ranked ZIP Codes

Methodology

Frequently Asked Questions

What is EPA Radon Zone 1?

Should I test for radon?

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