Start with a simple diagnostic
If the odor is only in hot water, the water heater may be involved. If it appears in both hot and cold water, the source is more likely the well or plumbing. Persistent slime or biological growth can point toward sulfur bacteria.
When oxidation works
Hydrogen sulfide is often treated by oxidation followed by filtration. Air injection, catalytic media or chemical oxidation may be used depending on concentration and water chemistry. Systems that also handle iron and manganese can be attractive when those contaminants occur together.
Why one sulfur number is not enough
pH, iron, manganese, flow demand and bacterial activity can all change the treatment design. A system sized for mild odor may fail on a well with high hydrogen sulfide plus iron.