Radon and home risks by county
Radon in Florida
None of Florida's 67 counties is in EPA's highest radon zone; 9 are in Zone 2, with moderate potential. Radon zones describe an area's potential; EPA recommends testing every home regardless of zone.
Tap water reports for Florida cities
Find your county by ZIP
Zone 2: moderate potential (9 counties)
| County | Residents | Water systems | Health violations since 2016 | Unresolved |
|---|---|---|---|---|
| Alachua County | 291,782 | 15 | 26 | 0 |
| Citrus County | 170,174 | 52 | 1 | 0 |
| Columbia County | 73,977 | 18 | 39 | 0 |
| Hillsborough County | 1,581,426 | 186 | 46 | 0 |
| Leon County | 300,488 | 24 | 0 | 0 |
| Marion County | 428,905 | 130 | 22 | 0 |
| Miami-Dade County | 2,838,461 | 25 | 15 | 0 |
| Polk County | 852,878 | 149 | 72 | 0 |
| Union County | 15,738 | 2 | 0 | 0 |
Zone 3: low potential (57 counties)
| County | Residents | Water systems | Health violations since 2016 | Unresolved |
|---|---|---|---|---|
| Baker County | 29,325 | 4 | 0 | 0 |
| Bay County | 199,718 | 10 | 11 | 0 |
| Bradford County | 28,075 | 7 | 0 | 0 |
| Brevard County | 658,447 | 27 | 28 | 0 |
| Broward County | 2,037,472 | 37 | 12 | 0 |
| Calhoun County | 13,278 | 2 | 0 | 0 |
| Charlotte County | 212,122 | 19 | 41 | 0 |
| Clay County | 236,760 | 12 | 0 | 0 |
| Collier County | 416,233 | 10 | 14 | 0 |
| DeSoto County | 36,744 | 10 | 13 | 0 |
| Dixie County | 17,614 | 4 | 1 | 0 |
| Duval County | 1,055,159 | 21 | 1 | 0 |
| Escambia County | 331,275 | 12 | 1 | 0 |
| Flagler County | 136,744 | 10 | 34 | 0 |
| Franklin County | 12,979 | 6 | 28 | 0 |
| Gadsden County | 44,151 | 15 | 4 | 0 |
| Glades County | 13,132 | 6 | 15 | 0 |
| Gulf County | 15,876 | 5 | 11 | 0 |
| Hamilton County | 14,334 | 3 | 0 | 0 |
| Hardee County | 26,068 | 9 | 0 | 0 |
| Hendry County | 46,130 | 9 | 42 | 0 |
| Hernando County | 218,150 | 15 | 0 | 0 |
| Highlands County | 109,778 | 29 | 76 | 0 |
| Holmes County | 19,876 | 7 | 0 | 0 |
| Indian River County | 172,139 | 3 | 3 | 0 |
| Jackson County | 49,980 | 15 | 5 | 0 |
| Jefferson County | 15,921 | 5 | 0 | 0 |
| Lafayette County | 8,640 | 2 | 0 | 0 |
| Lake County | 444,204 | 136 | 57 | 0 |
| Lee County | 860,959 | 20 | 18 | 0 |
| Levy County | 47,765 | 13 | 21 | 0 |
| Liberty County | 7,955 | 8 | 3 | 0 |
| Madison County | 18,364 | 5 | 5 | 0 |
| Manatee County | 458,352 | 7 | 1 | 0 |
| Martin County | 165,666 | 16 | 38 | 0 |
| Monroe County | 80,908 | 1 | 0 | 0 |
| Nassau County | 104,376 | 11 | 1 | 0 |
| Okaloosa County | 220,483 | 21 | 0 | 0 |
| Okeechobee County | 42,369 | 9 | 13 | 0 |
| Orange County | 1,533,646 | 45 | 25 | 0 |
| Osceola County | 468,058 | 28 | 41 | 0 |
| Palm Beach County | 1,582,055 | 33 | 31 | 0 |
| Pasco County | 659,114 | 67 | 5 | 0 |
| Pinellas County | 965,870 | 12 | 10 | 0 |
| Putnam County | 77,301 | 31 | 91 | 0 |
| Santa Rosa County | 207,653 | 15 | 0 | 0 |
| Sarasota County | 476,604 | 14 | 0 | 0 |
| Seminole County | 494,605 | 38 | 34 | 0 |
| St. Johns County | 334,928 | 21 | 2 | 0 |
| St. Lucie County | 390,670 | 20 | 33 | 0 |
| Sumter County | 154,693 | 24 | 57 | 0 |
| Suwannee County | 47,536 | 7 | 1 | 0 |
| Taylor County | 21,843 | 3 | 22 | 0 |
| Volusia County | 602,772 | 48 | 32 | 0 |
| Wakulla County | 37,115 | 7 | 20 | 0 |
| Walton County | 89,666 | 9 | 1 | 0 |
| Washington County | 26,503 | 6 | 14 | 0 |
EPA's radon map has no zone for Gilchrist County.
How to read this table
Water systems counts community systems that list the county in their service area; one system can serve several counties. Health violations are breaches of a legal limit or treatment rule recorded by EPA since January 2016, not paperwork lapses. A violation stays unresolved until the state records it as fixed.
Other states
- Arizona
- California
- Colorado
- Idaho
- Illinois
- Iowa
- Michigan
- Minnesota
- New Jersey
- New York
- Ohio
- Pennsylvania
- Texas
- Utah
Sources: EPA Map of Radon Zones, EPA ECHO Safe Drinking Water Act data (2026Q3, published October 2026), US Census Bureau Vintage 2024 estimates. See the methodology.