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Arsenic in Florida well water, by county

By the Tested Water teamLab data from the USGS and EPA Water Quality Portal, 2000 to 2026Updated November 8, 2026

Arsenic is widespread, over the limit in 15% or more of tested wells, in 3 of the 64 Florida counties with 10 or more tested wells. A county's share tells you how likely a problem is nearby. Only a test of your own well tells you what's in it.

Find an arsenic test See every county

How Florida compares with the rest of the country

Across Florida, about 1 in 27 tested wells had arsenic over the EPA limit of 10 µg/L (112 of 3,058). Across all tested wells in the US it's about 1 in 9. That's less often than in the country as a whole. Counties still differ, so check yours below.

Why it matters: Drinking it for years raises the risk of skin, bladder and lung cancer.

Arsenic dissolves out of certain rocks and old sediments, so it can be high even where nobody has polluted anything.

Arsenic in tested wells, county by county

Share of each county's tested wells with at least one result over the EPA limit of 10 µg/L. Counties need 10 or more tested wells to be listed. Widespread means 15% or more, worth checking 5 to 15%, rare under 5%.

CountyWells testedWells over the limitLevel
Dixie County 26
19% 5 of 26
 Widespread
Sarasota County 25
16% 4 of 25
 Widespread
Miami-Dade County 114
16% 18 of 114
 Widespread
Pinellas County 14
14% 2 of 14
 Worth checking
Hernando County 15
13% 2 of 15
 Worth checking
Gadsden County 19
11% 2 of 19
 Worth checking
Gulf County 21
10% 2 of 21
 Worth checking
Levy County 68
9% 6 of 68
 Worth checking
Collier County 276
8% 23 of 276
 Worth checking
Clay County 74
8% 6 of 74
 Worth checking
Lee County 61
7% 4 of 61
 Worth checking
Brevard County 50
6% 3 of 50
 Worth checking
Citrus County 17
6% 1 of 17
 Worth checking
Columbia County 52
6% 3 of 52
 Worth checking
Union County 18
6% 1 of 18
 Worth checking
Hendry County 37
5% 2 of 37
 Worth checking
Hillsborough County 98
4% 4 of 98
 Rare
Alachua County 84
4% 3 of 84
 Rare
Hamilton County 30
3% 1 of 30
 Rare
Flagler County 31
3% 1 of 31
 Rare
Nassau County 32
3% 1 of 32
 Rare
Okaloosa County 33
3% 1 of 33
 Rare
Orange County 73
3% 2 of 73
 Rare
Bay County 37
3% 1 of 37
 Rare
Santa Rosa County 40
2% 1 of 40
 Rare
Walton County 43
2% 1 of 43
 Rare
Gilchrist County 44
2% 1 of 44
 Rare
Pasco County 44
2% 1 of 44
 Rare
Putnam County 53
2% 1 of 53
 Rare
St. Johns County 57
2% 1 of 57
 Rare
Seminole County 58
2% 1 of 58
 Rare
Volusia County 124
2% 2 of 124
 Rare
Suwannee County 77
1% 1 of 77
 Rare
Polk County 84
1% 1 of 84
 Rare
Palm Beach County 96
1% 1 of 96
 Rare
Duval County 107
1% 1 of 107
 Rare
Lake County 107
1% 1 of 107
 Rare
Marion County 92
0% 0 of 92
 Rare
Broward County 50
0% 0 of 50
 Rare
Jackson County 49
0% 0 of 49
 Rare
Taylor County 47
0% 0 of 47
 Rare
Madison County 45
0% 0 of 45
 Rare
Lafayette County 37
0% 0 of 37
 Rare
Okeechobee County 37
0% 0 of 37
 Rare
Osceola County 37
0% 0 of 37
 Rare
Indian River County 36
0% 0 of 36
 Rare
Leon County 36
0% 0 of 36
 Rare
Martin County 36
0% 0 of 36
 Rare
Escambia County 30
0% 0 of 30
 Rare
Wakulla County 30
0% 0 of 30
 Rare
St. Lucie County 25
0% 0 of 25
 Rare
Highlands County 24
0% 0 of 24
 Rare
Manatee County 24
0% 0 of 24
 Rare
Jefferson County 23
0% 0 of 23
 Rare
Baker County 22
0% 0 of 22
 Rare
Charlotte County 20
0% 0 of 20
 Rare
DeSoto County 17
0% 0 of 17
 Rare
Sumter County 15
0% 0 of 15
 Rare
Washington County 14
0% 0 of 14
 Rare
Bradford County 13
0% 0 of 13
 Rare
Hardee County 13
0% 0 of 13
 Rare
Holmes County 11
0% 0 of 11
 Rare
Calhoun County 10
0% 0 of 10
 Rare
Glades County 10
0% 0 of 10
 Rare

3 more Florida counties have 1 to 9 tested wells for arsenic, too few to rate.

Download this table (CSV) · Free to reuse under CC BY 4.0

Where to get your well tested for arsenic in Florida

1

Free testing, with limits

Some Florida county health departments may test for certain chemicals for free, so call yours first. Check which tests it includes before you count on it for arsenic.

Florida's private well page
3

A mail-in kit

Fill the bottles at your kitchen tap and mail them back. We mark the kits that include arsenic.

Compare kits

Keep reading about wells in Florida

Questions people ask about arsenic in Florida

Is there arsenic in Florida well water?

Arsenic is widespread, over the limit in 15% or more of tested wells, in 3 of the 64 Florida counties with 10 or more tested wells. Across Florida, about 1 in 27 tested wells had arsenic over the EPA limit of 10 µg/L (112 of 3,058). Across all tested wells in the US it's about 1 in 9. That's less often than in the country as a whole. Counties still differ, so check yours below.

Where can I get my well tested for arsenic in Florida?

Some Florida county health departments may test for certain chemicals for free, so call yours first. If that doesn't cover you, use a lab certified by Florida for drinking water, or a mail-in kit that includes arsenic from a certified lab.

See Florida's list of certified labs, or compare mail-in kits.

Where these numbers come from

  • Lab tests: Water Quality Portal (USGS and EPA), well samples since 2000. A well counts as over if any of its tests was over the EPA limit of 10 µg/L. Wells tested for studies and monitoring, not a random sample of homes.
  • Likely overstated: our own check of who tested the wells, when and where. How we check.
  • State programs and links: Department of Health.