As much as it rains in Florida, rainwater seeps through the wild and ambles vegetation and leaves, naturally picking up the organic residue. After rain soaks into the aquifer, the organic compounds convert to sulfur. The sulfur is what gives the water its nasty smell compared to rotten eggs.

The distinct "rotten egg" smell frequently found in Florida tap water is caused by hydrogen sulfide gas (H2​S). This gas is a byproduct of sulfur-reducing bacteria that thrive in the oxygen-depleted environments of the Floridan Aquifer, the state's primary groundwater source. While these bacteria are naturally occurring and generally harmless to human health, they convert sulfates into smelly gas that can corrode plumbing and stain laundry. In 2026, this issue is most prevalent in private well systems or during the "wet season" when heavy rains shift the water chemistry. If the smell only occurs with hot water, it is likely a chemical reaction between the water’s sulfates and the magnesium anode rod inside your water heater. Many Floridians resolve this by replacing the magnesium rod with an aluminum-zinc alternative or installing specialized sulfur filters that use aeration or chlorine to neutralize the gas before it reaches the tap.