Florida Water Report
Get a free water test

Selenium

Systems reporting it
163
People served
489,328
Over the legal limit
0
Legal limit (MCL)
0.05 ppm

Overview

Selenium is a naturally occurring element that is essential in tiny amounts but harmful at high levels.

In Florida, Selenium was reported by 163 community water systems serving about 489,328 people. Every reported reading was at or below the federal legal limit. It was measured by 1,559 systems in all, so it was detected in 10% of the systems that tested for it.

The highest reading relative to the limit was at Altha, Town of Water System in Calhoun County, at 22% of it.

Where it comes from: Erosion of natural deposits; discharge from mines; runoff from farms.

The standards

Legal limit (MCL)
0.05 ppm

Enforceable. A utility must stay at or under this.

Federal health goal (MCLG)
0.05 ppm

Health-based, not enforceable. Often lower than the limit, sometimes zero.

California public health goal
30 ppb

California OEHHA PHG (2010) For comparison the legal limit is 50 ppb.

Health effects the EPA associates with it: Hair or fingernail loss, numbness in fingers or toes, and circulatory problems.

Water at or under the legal limit meets federal safety standards. A reading above a health goal is not the same as being unsafe, and health goals are set purely on health without regard to cost or treatability. Both are shown so the margin is visible either way.

Where in Florida

CountySystemsOver limit
Lee County283,137 people served4NoneManatee County58,584 people served1NoneCollier County33,030 people served2NonePolk County21,676 people served38NoneOkeechobee County20,000 people served1NoneLake County15,560 people served27NonePasco County6,664 people served12NoneCharlotte County5,216 people served3NoneMarion County4,843 people served11NoneSumter County4,642 people served1NoneAlachua County4,405 people served4NoneDesoto County3,549 people served2NoneUnion County3,000 people served1NoneHardee County2,940 people served1NoneBrevard County2,822 people served4NonePutnam County2,673 people served4NoneJefferson County2,517 people served2NoneHillsborough County2,434 people served15NoneVolusia County2,253 people served2NoneOrange County1,905 people served4NoneColumbia County1,555 people served8NoneGilchrist County1,175 people served1NoneGlades County880 people served1NoneCalhoun County800 people served1NoneSarasota County599 people served3NoneSeminole County500 people served1NonePalm Beach County425 people served1NoneSuwannee County410 people served2NoneHernando County365 people served2NoneLevy County290 people served1NoneHolmes County242 people served1NoneOsceola County120 people served1NoneWakulla County117 people served1None

Highest reported levels

Water systemReadingOf limit
Altha, Town of Water SystemAltha · Calhoun County0.011 ppm22%Van LakesAuburndale · Polk County0.01 ppm20%Stw Property DuplexesLake Alfred · Polk County0.01 ppm20%Kathleen Oaks MHPLakeland · Polk County0.008 ppm16%Lance WaterLake City · Columbia County0.008 ppm15%Fairview VillageWinter Haven · Polk County0.005 ppm10%Spruce Creek PreserveDunnellon · Marion County0.005 ppm10%Lady Lake Mobile Home ParkLady Lake · Lake County0.004 ppm9%Cool Breeze MHPLake City · Columbia County0.004 ppm8%Corley Island Mobile ManorLeesburg · Lake County0.004 ppm8%Bailey Place MHPMulberry · Polk County0.004 ppm8%Tampa Bay Water Reg. Surface Water PlantTampa · Hillsborough County0.004 ppm8%Tampa Bay Water -Cypress CreekClearwater · Pasco County0.004 ppm8%Tampa Bay Water/Lake BridgeLand O' Lakes · Pasco County0.004 ppm8%Noma Water WorksBonifay · Holmes County0.004 ppm8%Green Oaks MHPThonotosassa · Hillsborough County0.003 ppm7%Happy Traveler's RvpThonotosassa · Hillsborough County0.003 ppm6%North Pointe S/DAuburndale · Polk County0.003 ppm6%City of BradentonBradenton · Manatee County0.003 ppm6%Happy Day Trailer ParkAuburndale · Polk County0.003 ppm6%Buccaneer Bay MHP, LLCLakeland · Polk County0.003 ppm6%Bud Well #7 WTPValrico · Hillsborough County0.003 ppm6%TBW/S. Pasco Wellfield Chemical Feed SysWesley Chapel · Pasco County0.003 ppm6%Azalea Park SubdivisionLake City · Columbia County0.003 ppm6%Picciola Island SubdivisionFruitland Park · Lake County0.003 ppm6%

Showing the 25 highest of 163 systems that reported Selenium.

Schedule a Free In-Home Water Test

Get Started

Data Sources

EPA SDWISSystem identity, population, countyret. 2026
FDEPFlorida drinking-water chemical monitoringret. 2026
CCREach utility’s own annual reportret. 2026

These figures describe water as delivered by each utility, not what your home’s plumbing adds after it arrives. Informational; not a substitute for testing your own tap.