Water guides · Updated October 27, 2026
Why does my well water smell like rotten eggs or leave orange stains?
Short answer: a rotten-egg smell usually comes from hydrogen sulfide gas, and orange or red stains usually come from iron. Both are aesthetic issues the EPA covers under secondary (non-enforceable) standards. A sniff test on hot vs. cold water helps find the source. This guide explains the causes; if you already know you need equipment, see our iron and sulfur filtration service or the well water treatment page.
A rotten-egg smell from the tap and orange rings in the sink or toilet are two of the most common reasons well owners in Lee, Collier, and Charlotte counties call about filtration. They are especially familiar in well areas such as Lehigh Acres, North Fort Myers, Golden Gate Estates, and parts of Port Charlotte and Punta Gorda. The goal is to figure out where the problem comes from before buying equipment.
The rotten-egg smell: hydrogen sulfide
The Florida Department of Health notes that hydrogen sulfide gas can occur in wells anywhere in Florida and causes the familiar “rotten egg” smell. Its Well Water Facts: Odor & Staining sheet suggests a simple check to narrow down the source:
- Smell only on hot water: the water heater is a likely source
- Smell only on softened water: the softener is a likely source
- Strong at first, then fades as the water runs: the well or plumbing is a likely source
- Strong and constant on both hot and cold: likely hydrogen sulfide in the groundwater
Orange and red stains: iron
Iron, and iron bacteria, can leave red or orange stains in sinks, tubs, toilets, and laundry, according to the same DOH sheet. The U.S. EPA treats iron, odor, and color as secondary drinking water standards, which are aesthetic guidelines and not federally enforceable. Even so, staining and odor are real day-to-day problems, and they are treatable.
Why a softener alone usually is not the answer
Softeners address hardness. Iron can foul a softener if it is not handled first, and a softener is not designed to remove a sulfur smell. Depending on the test, the right setup may be iron and sulfur filtration, a softener, both in the right order, or a whole-home system.
Private wells: testing beyond odor and stains
About 12% of Floridians are served by private wells or limited-use systems, according to the Florida Department of Health, and well water is not covered by utility reports. DOH recommends that private well owners test for bacteria and nitrate at least once a year through a county health department or a state-certified lab. The EPA’s private well guidance covers what else to consider. Our in-home test is a field check for the conditions we treat, such as hardness, pH, and iron; it is not a substitute for that lab testing.
What we do at a free water test
We check the water at your tap, help track down where an odor shows up, and go over the results with you before recommending anything. If nothing needs treating, that is the answer you will get. Learn more about the free water test.
Book a free in-home water test: call 239-376-0640 or send a request. Waterbird SWFL serves Lee, Collier, and Charlotte counties, from Marco Island to Port Charlotte. Florida Certified Plumbing Contractor, Lic. #CFC1433714.