Over 2.6 million Floridians use private wells[5]. Florida has some of the hardest and most sulfur-rich well water in the country. If your water smells like rotten eggs, you are not alone.
Quick Answer
Florida well water is typically very hard and often has a sulfur smell. Test for bacteriaColiform BacteriaA group of bacteria used as indicators of potential contamination. Total coliform presence suggests a pathway for pathogens to enter your well.EPA MCL: 0 (no coliform should be present)Learn more → (contamination indicators), nitratesNitratesCompounds that enter groundwater from fertilizers, septic systems, and animal waste. Especially dangerous for infants under 6 months (blue baby syndrome).EPA MCL: 10 mg/L (ppm)Learn more → (fertilizer compounds), hardnessHardness (Calcium Carbonate)The concentration of dissolved calcium and magnesium in water. Hard water causes scale buildup in pipes, water heaters, and fixtures.No EPA standard. Soft: <1 gpg. Moderate: 1-7 gpg. Hard: 7-10.5 gpg. Very Hard: >10.5 gpg.Learn more → (dissolved calcium), hydrogen sulfideHydrogen SulfideA gas dissolved in groundwater that produces a rotten egg smell. Created by sulfur-reducing bacteria or naturally occurring sulfur deposits in bedrock.No EPA standard. Nuisance threshold: 0.05 mg/L (detectable by smell)Learn more → (rotten egg gas), ironIronA naturally occurring mineral found in groundwater. Iron causes orange/rust staining on fixtures and laundry and gives water a metallic taste.EPA Secondary MCL: 0.3 mg/L (ppm)Learn more → (staining mineral), and pH.
Why Florida Well Water Is Different
Florida sits on the Floridan Aquifer — one of the most productive limestone aquifers in the world[2].
Limestone dissolves easily. This means very hard water (often 15–25+ GPGGPG (Grains Per Gallon)A unit used specifically for water hardness. 1 gpg = 17.1 mg/L of calcium carbonate. Water softeners are sized based on gpg.Learn more →, or grains per gallon). The limestone is also rich in sulfur, which feeds sulfur-reducing bacteria that create that rotten egg smell[3].
Most Common FL Well Water Issues
| Issue | How Common in FL | Learn More |
|---|---|---|
| Very hard water | Extremely common (15–30 GPG) | Hard water guide |
| Sulfur smell | Very common | Sulfur guide |
| Iron | Common | Iron guide |
| Bacteria | Moderate (shallow wells, flooding) | Bacteria guide |
| Tannins | Common in shallow wells near wetlands | Water test guide |
| Nitrates | Agricultural areas, septic-dense areas | Nitrates guide |
Have your test results? Get a plain-English diagnosis.
Analyze My Water TestFL Well Water by Region
North Florida / Panhandle
Shallower wells. Iron and tannins are common. Hard water from limestone. Bacteria risk from flooding during hurricane season[2].
Central Florida (Orlando, Tampa, Ocala)
Deep into the Floridan Aquifer. Very hard water and strong sulfur smell. This is the epicenter of FL hard water issues[3].
South Florida (Miami-Dade to Naples)
Shallow Biscayne Aquifer in the east. Higher bacteria and nitrate risk from dense development and septic systems. West coast taps the deeper Floridan Aquifer — hard water and sulfur[4].
Where to Get Tested in Florida
- County health departments — most offer bacteria testing[1].
- UF/IFAS Extension — water testing clinics in many counties[3].
- Private certified labs — check FL DOH for certified listings.
- Mail-in services — Tap Score accepts FL samples ($100–$300).
What to Do Next
Sulfur smell? Read our sulfur guide. Most FL sulfur is treatable with an air injection system.
Hard water? You almost certainly need a water softener. FL hardness is among the highest in the U.S.
Have results? Use our Water Test Interpreter.
Frequently Asked Questions
Why does FL well water smell like sulfur?
The Floridan Aquifer is limestone rich in sulfur minerals. Bacteria convert these into hydrogen sulfide gas[2].
Is FL well water safe to drink?
It can be, after testing. FL well water is often very hard with sulfur smell. Test first, treat what needs it[1].
References
- Florida Department of Health. "Private Well Testing." Bureau of Environmental Health, 2024. https://www.floridahealth.gov
- U.S. Geological Survey. "Groundwater Quality in Florida." NAWQA, 2023. https://www.usgs.gov/mission-areas/water-resources
- UF/IFAS Extension. "Private Drinking Water Wells in Florida." University of Florida, 2023.
- Florida DEP. "Groundwater Protection." 2024. https://floridadep.gov
- U.S. Census Bureau. "Households Using Wells by State." 2021.
- Florida Administrative Code. "62-532: Water Well Permitting and Construction." 2024.